If you are preparing for USMLE Step 2 CK, the NBME Free 120, officially the Step 2 CK Sample Test Questions, is the closest free preview you will get of the real exam interface, question style, and difficulty. The catch is that the official PDF gives you only an answer key, a single letter per item, with no reasoning. This set of free 120 step 2 explanations from IMG Helping Hands Corp fixes that, below you will find complete, high-yield Free 120 step 2 explanations for all 120 items, each one explained the way a strong tutor would explain it at the whiteboard.
The NBME Free 120 Step 2 is a free, official set of 120 practice questions released by the NBME and FSMB so you can rehearse the exact look and feel of Step 2 CK before test day. It is split into three 40 question blocks that mirror the real exam. Because the official download includes only an answer key, most students finish the set unsure why their answers were right or wrong, and that is precisely the gap these explanations are built to close.
For every question we do four things:
The explanations are organized to mirror the exam exactly, Block 1 through Block 3, so you can read alongside the official PDF. Whether you are an international medical graduate (IMG) building your Step 2 CK strategy, a first-time test-taker doing a final content pass, or a repeat examinee closing knowledge gaps, this NBME Free 120 answer and explanation guide is built to be your single, clean reference. Work a block, check your answers here, and lock in the concept before moving on.
Download the official NBME Free 120 (Step 2 CK Sample Test Questions):
• Sample test questions page: usmle.org/exam-resources/step-2-ck-materials/step-2-ck-sample-test-questions
Internal medicine, psychiatry, pediatrics, OB/GYN, ethics, and the high-yield clinical basics.
Recurrent, abrupt 10-minute attacks of chest pain, palpitations, sweating, and impending doom + avoidance of public places out of fear of having an attack → agoraphobia.
A Agoraphobia
This young man has discrete panic attacks (sudden, peaking in minutes surges of cardiopulmonary symptoms plus a fear of dying). The diagnosis the question targets, however, is the behavioral consequence: he now restricts leaving home, dating, and social outings specifically because he fears being in a situation where escape is hard or help unavailable if an attack strikes. That avoidance of multiple situations to prevent feared panic is the textbook definition of agoraphobia. On Step 2 CK, the key is recognizing that the fear is of the attack and entrapment, not of social scrutiny.
Panic attacks + avoiding places you cannot easily escape = agoraphobia.
Young man, stroke during Valsalva (weight-lifting) + a swollen, tender leg (DVT) + clean carotids → a clot crossing a PFO = needs an echo bubble study.
E Echocardiography with bubble study
A 35 years-old with no vascular risk factors who strokes during heavy lifting, has a swollen tender calf, and normal carotids is the classic paradoxical embolism vignette: a venous thrombus passes right-to-left through a patent foramen ovale (transiently opened during Valsalva) and lodges in the brain. The single test that demonstrates this is transthoracic/transesophageal echocardiography with agitated-saline (bubble) contrast, which shows microbubbles crossing into the left atrium. This both confirms the shunt and screens for cardiac sources.
Young stroke + DVT + Valsalva = paradoxical embolus through a PFO → bubble-study echo.
Progressive exertional dyspnea + nonproductive cough + bilateral fine crackles in a patient on long-term amiodarone → drug-induced interstitial lung disease.
A Amiodarone
Insidious dyspnea and dry cough with diffuse fine inspiratory crackles and no infection, exposure, or heart-failure signs (no JVD) in a patient on chronic amiodarone is classic amiodarone-induced pulmonary fibrosis/interstitial pneumonitis. Amiodarone accumulates in lung tissue and causes a dose- and duration-dependent inflammatory and fibrotic injury. It is the most feared and most likely culprit here, and stopping the drug (plus considering steroids) is management.
Chronic amiodarone + dry cough + diffuse crackles = pulmonary fibrosis. Watch lungs, liver, and thyroid.
Recurrent low-trauma fractures + blue sclerae + affected mother → osteogenesis imperfecta, which causes conductive hearing loss.
A Audiography
Multiple fractures from trivial trauma, blue sclerae, easy bruising, and a similarly affected parent point to osteogenesis imperfecta, a type I collagen defect. Beyond brittle bones, defective collagen affects the ossicles of the middle ear, producing progressive conductive (and later mixed) hearing loss that often begins in childhood/early adulthood. Regular audiography is therefore the appropriate ongoing screen so hearing loss is caught and managed early.
Blue sclerae + brittle bones = OI → screen the ears (conductive hearing loss).
Incapacitated patient, no health-care proxy, lives with a 20-year devoted boyfriend but has an adult son → the legal next-of-kin (adult child) decides.
E Son
When a patient lacks capacity and has named no health-care power of attorney, decisions fall to the legal surrogate hierarchy. After a spouse, the next priority is an adult child. The boyfriend, however devoted and involved, is not a legal spouse and has no statutory standing: the daily-caregiving neighbor likewise has none. Therefore the adult son is the appropriate surrogate, even though he lives out of state, because he is the closest legal next of kin.
No proxy? Default order: spouse → adult child → parent → sibling. Living with someone ≠ legal surrogate.
Post-cardiac-surgery infant with sudden shock, cool clammy skin, oliguria, and an abnormal arterial tracing → tamponade, evaluated with echocardiography.
C Echocardiography
Five days after open-heart surgery, the sudden onset of cold, clammy extremities, delayed capillary refill, and minimal urine output signals obstructive/cardiogenic shock. After sternotomy, the leading concern is pericardial tamponade from accumulating blood or effusion, producing low cardiac output, narrow pulse pressure, and pulsus paradoxus on the arterial tracing. The fastest, safest bedside test to confirm a pericardial collection and impaired filling is echocardiography, which directly guides drainage.
Shock after cardiac surgery = think tamponade → echo first.
Child with periorbital and lower extremity edema + large proteinuria after a viral URI → nephrotic syndrome with hypoalbuminemia.
B Serum albumin concentration
Periorbital and dependent pitting edema plus heavy (“large”) proteinuria in a young child is nephrotic syndrome, most commonly minimal change disease. Massive urinary protein loss depletes serum albumin: the resulting drop in oncotic pressure drives the generalized edema. So among the listed labs, serum albumin is the value most likely to be decreased.
Nephrotic = lose albumin in urine → low serum albumin, high lipids, edema.
Nighttime cough once weekly + exertional symptoms limiting activity in a child on PRN albuterol only → mild persistent asthma needs a daily inhaled steroid.
B Add fluticasone by metered-dose inhaler with a spacer to the regimen
Symptoms more than twice weekly, nighttime awakenings, and exercise-limiting cough place her beyond intermittent asthma into at least mild persistent disease. The guideline step-up from a SABA-only regimen is to add a daily low-dose inhaled corticosteroid, the controller of choice. Inhaled fluticasone reduces airway inflammation and is the appropriate next step.
Persistent asthma (symptoms >2x/week or nighttime cough) → step up to a daily inhaled corticosteroid.
30-year-old smoker, BMI 29, family history of early MI → check a fasting lipid panel for ASCVD risk factors.
B Fasting serum lipid studies
This man carries several modifiable cardiovascular risks: tobacco use, overweight/obesity, and a first-degree relative with premature coronary disease (father MI at 48). Lipid screening is indicated to quantify atherosclerotic risk and guide statin and lifestyle decisions. With these risk factors, a fasting lipid profile is the appropriate screening study now rather than waiting.
Smoker + obese + premature-MI family history → screen lipids to estimate ASCVD risk.
Decades of PPI/antacid use + heavy alcohol + loss of vibration/proprioception with absent ankle reflexes → vitamin B12 deficiency.
F Vitamin B (cyanocobalamin) supplementation
Chronic calcium-carbonate antacid use suppresses gastric acid needed to release B12 from food, and long-standing alcohol intake adds to deficiency. The exam shows dorsal-column loss (decreased vibration and proprioception) with a sensory peripheral neuropathy, the picture of subacute combined degeneration from B12 deficiency. Replacing cyanocobalamin halts and may reverse progression of these neurologic findings.
Antacids + alcohol + lost vibration/position sense = low B12 → give cyanocobalamin (folate won’t save the cord).
Smokeless-tobacco user with a firm, non-wipeable 1-cm white buccal plaque → leukoplakia, a premalignant lesion that must be biopsied.
B Surgical biopsy of the oral lesion
A persistent white patch that cannot be scraped off, in a heavy chewing-tobacco user, is leukoplakia, a potentially premalignant lesion that can harbor dysplasia or squamous cell carcinoma. The standard of care is tissue diagnosis via biopsy of the lesion to exclude malignancy: you cannot rely on appearance alone. Encouraging tobacco cessation plus biopsy is correct management.
White oral patch that won’t wipe off + tobacco = leukoplakia → biopsy to rule out SCC.
Heavy chronic alcohol + biventricular failure (crackles, S3, hepatomegaly, edema) with hypotension → dilated cardiomyopathy.
B Dilated cardiomyopathy
Two decades of heavy beer drinking with progressive exertional dyspnea, weight gain from fluid retention, an S3 gallop, bibasilar crackles, hepatic congestion, and peripheral edema describe congestive heart failure from a dilated, poorly contracting heart. Chronic alcohol is directly cardiotoxic, producing four-chamber dilation with reduced ejection fraction. Echocardiography will show a dilated left ventricle with globally decreased systolic function.
Chronic heavy alcohol + global heart failure = dilated cardiomyopathy (big floppy ventricle, low EF).
Parkinson patient falling backward with a positive pull test (postural instability) → dopaminergic drugs don’t fix this: physical therapy does.
B Physical therapy
Postural instability, the retropulsion and falls on turning shown by a positive pull test, is the Parkinson feature that responds poorly to dopaminergic medication. To actually reduce fall risk, gait and balance training, assistive-device fitting, and home-safety work through physical therapy are the evidence-based intervention. Adding more dopamine agonists won’t reliably improve this axial symptom and may add side effects.
Parkinson postural instability/falls = the symptom levodopa won’t fix → physical therapy for balance.
Adopted child with average IQ and age-appropriate adaptive/social skills who can do math but cannot read in any language → a specific learning disorder.
D Learning disorder
This boy reaches a normal IQ on receptive testing, has appropriate daily-living skills, plays and bonds well, and even performs basic mathematics, yet he cannot read even in his native Russian. An isolated, unexpected reading deficit out of proportion to his intelligence and other skills defines a specific learning disorder (dyslexia). His warm relationships and protectiveness argue against attachment or autism pathology.
Normal IQ + normal adaptive skills + one out-of-line academic deficit = specific learning disorder.
Urticaria + respiratory distress + hypotension after a drug (amoxicillin) → anaphylaxis: epinephrine first.
C Administration of epinephrine
Two or more organ systems involved, here skin (diffuse urticaria), respiratory (distress, tachypnea), and cardiovascular (BP 90/60), after a clear allergen exposure, is anaphylaxis. The immediate, life-saving treatment is intramuscular epinephrine, which reverses bronchospasm, vasodilation, and capillary leak. Antihistamines and bronchodilators are adjuncts only and must never delay epinephrine.
Two systems + an allergen = anaphylaxis → IM epinephrine NOW (antihistamines are just sidekicks).
Recent C. difficile colitis with ongoing loose stools → spores resist alcohol, so wash with soap and water.
B Washing hands thoroughly with soap and water
This patient had C. difficile and still has diarrhea, so spore-based contact precautions apply. Alcohol-based hand gel does NOT kill C. difficile spores: only mechanical removal by handwashing with soap and water reliably reduces transmission. Along with gown and gloves, soap-and-water hand hygiene is the correct precaution.
C. diff spores laugh at alcohol → wash with soap and water.
At medium and high doses, BMT-vs-MMT retention differences were “not significant” → unclear efficacy difference.
E There is an unclear difference in efficacy between the two drugs at these doses
The abstract’s retention table shows that high-dose BMT vs high-dose MMT and medium-dose BMT vs medium-dose MMT both yielded results that were “not significant” (confidence intervals crossing the null). So when counseling this patient about medium- or high-dose buprenorphine versus methadone, the honest, evidence-based statement is that the difference in efficacy at those doses is unclear. Only the flexible- and low-dose comparisons reached significance favoring methadone.
Nonsignificant CI (crosses null) = “we can’t tell” → unclear difference at medium/high doses.
Including trials as short as 2 weeks undermines conclusions about long-term maintenance therapy → that limits confidence.
E Inclusion of trials with an intervention duration of 2 weeks
Maintenance therapy for opioid use disorder is meant to be sustained, so retention and ongoing drug-use outcomes need adequately long follow-up. Pooling trials lasting only 2 weeks with trials running up to 52 weeks introduces heterogeneity and lets very short studies, which cannot meaningfully assess maintenance retention, distort the summary estimates. That short-duration inclusion most undermines confidence in the conclusions.
Maintenance question + 2-week trials lumped in = mismatched duration → shaky conclusions.
Reviews of published literature over-represent positive trials → publication bias most threatens the result.
C Likelihood that more trials with positive results will be published
The classic systematic-review bias is publication bias: studies with statistically significant (positive) findings are more likely to be published and thus found, while null trials languish unpublished. A meta-analysis built largely from databases of published literature therefore risks an inflated, skewed pooled estimate. That is the bias most likely to distort these results.
Meta-analysis + published-only studies = publication bias (positive trials get printed).
GCS 3, absent oculocephalic/corneal/caloric reflexes after a ruptured aneurysm + patient wanted to donate → brain death: contact the organ procurement organization.
B Contact the organ bank for potential donation
Absent brainstem reflexes (no doll’s-eye, no corneal, no caloric response) with GCS 3 after a catastrophic aneurysm rupture indicate brain death. Federal requirements mandate that the organ procurement organization (organ bank) be notified of every imminent/declared brain death so that trained coordinators, not the treating team, evaluate suitability and approach the family. Since the patient expressed a wish to donate, contacting the organ bank is the appropriate next step.
Brain death → always call the organ procurement organization: they (not the team) decide and approach family.
Category I tracing (HR 150, moderate variability, accelerations, no decels) with normal labor progress at 9 cm → just keep going.
C Expectant management
The fetal heart tracing is reassuring: a normal baseline, moderate variability, accelerations, and no decelerations define a Category I strip. Labor is progressing normally (6 to 9 cm in 30 minutes, vertex descending to +1). With a reassuring fetus and adequate progress and the cervix not yet fully dilated, the correct move is to continue to observe, allowing labor to advance to complete dilation.
Category I tracing + normal progress, not fully dilated = expectant management (don’t intervene on a happy baby).
Recurrent sinopulmonary infections + two pneumonias + low IgA, IgG, and IgM → CVID, treated with immunoglobulin replacement.
E Monthly immune globulin replacement therapy
Recurrent sinusitis and pneumonias in an adult with pan-low immunoglobulins (IgA, IgG, and IgM all decreased) is common variable immunodeficiency, a defect in B-cell differentiation and antibody production. The definitive preventive therapy is regular (typically monthly IV or weekly subcutaneous) immune globulin replacement, which supplies the missing antibodies and markedly reduces infection frequency.
Recurrent sinopulmonary infections + all immunoglobulins low = CVID → replace immune globulin.
Chronic HBsAg-positive infection (from China) with mildly elevated transaminases → long-term risk of hepatocellular carcinoma.
C Hepatocellular carcinoma
HBsAg positive with IgG anti-HBc and negative anti-HBs indicates chronic hepatitis B infection, common in patients from endemic regions. Hepatitis B is directly oncogenic (its DNA integrates into hepatocytes) and causes HCC even without cirrhosis. Left untreated, this chronic carrier is at significant risk of developing hepatocellular carcinoma, which is why such patients undergo surveillance ultrasonography.
Chronic HBV integrates into DNA → hepatocellular carcinoma (even without cirrhosis): screen with ultrasound.
Hemophilia A boy with an acutely warm, swollen, painful knee → hemarthrosis: replace the deficient factor VIII.
B Factor VIII concentrate
Hemophilia A is X-linked factor VIII deficiency, and the hallmark complication is recurrent hemarthrosis, a hot, swollen, painful joint as shown here. Acute bleeding is treated by immediately replacing the missing clotting factor with factor VIII concentrate to restore hemostasis and limit joint damage. This is both the diagnosis-driven and management answer.
Hemophilia A = factor VIII deficiency → bleeding joint gets factor VIII concentrate.
Elderly man with central metamorphopsia (straight lines look wavy/curved) and decreased central acuity → macular degeneration.
D Macular degeneration
Distortion of straight lines (crossword lines look curved, blinds appear wavy), called metamorphopsia, plus loss of central visual acuity with clear lenses and a normal red reflex is the classic presentation of age-related macular degeneration. The macula’s central vision is selectively affected, which is exactly what an Amsler grid abnormality captures. The painless, gradual course in an elderly patient seals the diagnosis.
Wavy/distorted central lines (metamorphopsia) in the elderly = macular degeneration (check the Amsler grid).
Painful bite from a spider in the southeastern US mountains → brown recluse envenomation: central necrosis/eschar develops.
A Areas of eschar at the center of the wound site
A sudden painful bite from a spider in the southeastern United States, evolving over days, points to the brown recluse (Loxosceles). Its venom (sphingomyelinase D) causes dermonecrosis: the lesion classically develops a central area of ischemic necrosis with a “red-white-and-blue” appearance that progresses to a dark eschar over the next day or so. So central eschar formation is the expected next finding.
Brown recluse venom = dermonecrosis → central eschar (“red, white, and blue” necrotic ulcer).
Repeated BP ~138/87 (stage 1) without high ASCVD risk or other disease → start lifestyle modification, the DASH diet.
C DASH diet
With readings of 136/85 a year ago and 138/87 today, this otherwise healthy man has stage 1 hypertension. In the absence of established cardiovascular disease, diabetes, CKD, or high estimated 10-year ASCVD risk, the recommended first step is lifestyle modification. The DASH eating plan (rich in fruits, vegetables, low-fat dairy, reduced sodium) plus weight loss is the evidence-based intervention to lower pressure and cardiovascular risk before drugs.
Stage 1 HTN, low ASCVD risk = lifestyle first → DASH diet, weight loss, less salt.
Thin young man, weight loss, polyuria/polydipsia, glucose 578, lean BMI 19 → type 1 diabetes: treat with insulin.
B Insulin therapy
A lean 39-year-old with rapid weight loss despite normal appetite, marked hyperglycemia (glucose 578, HbA1c 10.7%), and classic osmotic symptoms is presenting with type 1 (insulin-deficient) diabetes. Because he is insulinopenic and severely hyperglycemic, the correct and necessary therapy is insulin. Oral agents that rely on residual beta-cell function or insulin sensitivity are inadequate here.
Lean + weight loss + very high glucose = type 1 diabetes → insulin, not oral pills.
Hyponatremic seizure (Na 122) after closed head injury → SIADH: treat the symptomatic hyponatremia with hypertonic saline.
A Administer a bolus of intravenous 3% saline
A closed head injury triggering SIADH produces hyponatremia (Na 122), and this child has now had a symptomatic (seizure) presentation. Acute symptomatic hyponatremia is a neurologic emergency treated with a bolus of hypertonic (3%) saline to rapidly raise serum sodium just enough to stop the seizure and prevent cerebral edema. This is the immediate next step.
Hyponatremic seizure = neuro emergency → bolus 3% hypertonic saline to stop it.
Regional tender lymphadenopathy (axillary + epitrochlear) in a cat owner → Bartonella henselae, cat-scratch disease.
B Cat-scratch disease
Tender, mobile axillary and epitrochlear lymphadenopathy in someone who lives with a cat is the classic picture of cat-scratch disease caused by Bartonella henselae, transmitted by a scratch or bite. Regional lymphadenitis draining the inoculation site (here the upper extremity) is the hallmark, and it is usually self-limited in immunocompetent hosts. The epitrochlear node involvement is a strong pointer.
Cat + tender regional (axillary/epitrochlear) nodes = cat-scratch disease (Bartonella henselae).
Parents asking when to tell a toddler she’s adopted → as early as possible.
B As early as possible, even if she cannot process the whole experience
Best practice in child development and pediatrics is to talk about adoption openly and early, weaving it into the child’s life story from a young age even before she can fully understand. Early, ongoing, age-appropriate disclosure makes adoption a normal, shame-free part of identity and prevents the trauma of discovering it later or feeling deceived. So the right advice is to begin as early as possible.
Tell early and often: adoption disclosure should start as young as possible.
QI team wants fewer catheter-days → first diagnose why lines stay in by asking front-line providers.
A Ask clinical providers in the unit to identify what they believe to be the most common factors leading to nonremoval of central venous catheters
The first step in any quality-improvement cycle is to understand the current process and root causes before designing an intervention. Asking the frontline clinicians what actually keeps catheters in place identifies the real barriers (forgotten reassessment, perceived need, access concerns) so any subsequent intervention targets the true problem. Jumping to a solution before this analysis risks fixing the wrong thing.
QI: understand the process and root causes FIRST, then design the fix.
Adolescents with 3 months of postprandial epigastric pain after a self-limited diarrheal illness → upper endoscopy is most likely to confirm the diagnosis.
B Endoscopy
Chronic epigastric pain worse after meals points to an upper-GI mucosal process such as peptic ulcer disease, gastritis, or, after exclusion, functional dyspepsia. The test that most directly confirms or excludes mucosal pathology, including H. pylori, ulcers, and inflammation, is upper endoscopy with biopsy. It both visualizes and samples the gastric/duodenal mucosa, making it the confirmatory study here.
Chronic postprandial epigastric pain → endoscopy (look AND biopsy the upper-GI mucosa).
Acute wheezing and cough after inhaling mixed cleaning-agent fumes, with diffuse wheezes and mild hypoxemia → bronchospasm: treat with albuterol.
A Albuterol therapy
Mixing acetic acid with other cleaning agents released irritant gases that triggered acute reactive bronchospasm: paroxysmal cough, diffuse wheezing, hyperinflation on x-ray, and mild hypoxemia. The patient is protecting his airway, has no accessory-muscle use, and is normocapnic, so the appropriate initial step is an inhaled bronchodilator (albuterol) to relieve bronchospasm.
Irritant fumes + diffuse wheeze = bronchospasm → first reach for albuterol.
Terminal carcinomatosis with an inoperable obstruction (already told no further surgery) but family requests laparotomy → discuss futility.
C Explain the futility of the operation to the patient and his family
This man has end-stage metastatic colon cancer with diffuse carcinomatosis and a malignant small-bowel obstruction: he was already informed that further surgery offers no benefit and carries no surgical option. When a patient/family requests a non-beneficial operation, the physician’s obligation is to compassionately explain why the surgery is futile and to redirect toward goals-of-care and palliative measures (the recommended NG and PEG tubes). Honest discussion of futility is the appropriate next step.
Family wants a futile operation → physician’s job is honest counseling about futility + palliation.
Weight loss, anxiety, tremor, AFib, diffuse goiter with bruit, onycholysis, AND pretibial myxedema (peau d’orange) → Graves thyrotoxicosis.
E Thyrotoxicosis
Hypermetabolic features (weight loss, anxiety, insomnia, frequent stools, fine tremor, palmar erythema) with an irregularly irregular pulse (atrial fibrillation), a diffusely enlarged thyroid with an audible bruit, onycholysis (Plummer nails), and pretibial myxedema (peau d’orange skin thickening over the feet) are diagnostic of Graves disease, an autoimmune cause of thyrotoxicosis. The thyroid bruit and pretibial myxedema are essentially pathognomonic.
Goiter + bruit + pretibial myxedema + onycholysis = Graves thyrotoxicosis.
Hematochezia with skip ileal ulcers and normal intervening mucosa → Crohn disease: the modifiable factor is smoking cessation.
D Smoking cessation
Coalesced ulcers with normal-appearing mucosa between them (“skip lesions”) involving the ileum, in a young man with chronic loose stools, iron-deficiency anemia, and right-lower-quadrant tenderness, is Crohn disease. Smoking is a well-established factor that worsens Crohn disease, increasing flares, complications, and surgery, so advising this two-pack-a-day smoker to quit is the most important recommendation for his condition.
Skip lesions + ileal involvement = Crohn → smoking makes Crohn WORSE, so quit (note: smoking helps UC, hurts Crohn).
Stab medial to the left nipple + hypotension, tachycardia, and JVD → cardiac tamponade: positive FAST leads to pericardial drainage.
D Pericardiocentesis
A precordial stab wound (medial to the left nipple) that produces Beck’s triad findings, hypotension, distended neck veins, and tachycardia, signals penetrating cardiac injury with pericardial tamponade. A FAST exam will show pericardial fluid: the immediate decompressing step in an unstable patient is pericardiocentesis (as a bridge to definitive surgical repair / pericardial window). This relieves the obstructive shock.
Precordial stab + hypotension + JVD = tamponade (Beck’s triad) → pericardiocentesis.
No locatable consent form and no site marking on a sedated patient → you cannot proceed: stop and remove the patient from the OR.
C Do not proceed, and remove the patient from the operating room
The Universal Protocol/surgical “time-out” exists precisely to prevent wrong-patient, wrong-site, and unconsented surgery. With no consent form available for review and no site marking, the safety check has failed, and the patient is already sedated and cannot give valid informed consent now. The only correct action is to not proceed: the patient should be removed from the OR so consent and documentation can be properly re-established.
No consent, no site mark, patient sedated = STOP. You cannot consent to a sedated patient: abort and reset.
New diagnosis of oligospermia → before any treatment, take a history of modifiable lifestyle factors.
A Ask the patient about his alcohol intake, smoking, and stress level
With oligospermia and low-normal testosterone, the appropriate initial action is to gather more history, specifically about reversible lifestyle contributors such as alcohol use, smoking, and stress, which can all impair spermatogenesis. Identifying and correcting these modifiable factors is the logical first step before pursuing hormonal therapy or assisted reproduction.
Oligospermia first move = history (alcohol, smoking, stress, heat) before hormones or IVF: never give exogenous testosterone.
Get an honest read on your prep from mentors who’ve matched as IMGs, and a plan built around your weak blocks.
Medicine, surgery, neurology, women’s health, biostatistics, and clinical decision-making.
Fever, sore throat, myalgias after travel/nightlife abroad, with pancytopenia (anemia, leukopenia, relative lymphopenia) and a NEGATIVE Monospot → acute HIV seroconversion.
D HIV RNA polymerase chain reaction testing
This man has a mononucleosis-like illness (fever, pharyngitis, fatigue, myalgias) but a negative Monospot, and his labs show the cytopenias that classically accompany acute retroviral syndrome. A recent high-risk exposure during travel raises the pretest probability. During the early “window period,” the standard HIV antibody/antigen immunoassay can still be negative, so the test that detects infection earliest is plasma HIV RNA (viral load) by PCR, which turns positive within days of infection. That is the most appropriate next diagnostic step.
Mono symptoms + negative Monospot + cytopenias + risky exposure = check HIV RNA PCR (catches the window period).
Found unconscious after opioid overdose with a cold, cyanotic, compressed limb and CK of 50,000 U/L → crush/rhabdomyolysis, whose feared early complication is acute kidney injury.
A Acute kidney injury
Prolonged immobility from an opioid overdose caused limb compression and massive muscle breakdown, reflected by the strikingly elevated creatine kinase. Myoglobin released from necrotic muscle is directly nephrotoxic, causes tubular obstruction, and triggers renal vasoconstriction, making pigment-induced acute kidney injury the greatest risk. The hyperkalemia and low bicarbonate already hint at evolving renal and metabolic compromise. Aggressive IV fluids to maintain urine output are the cornerstone of prevention.
Crushed muscle → myoglobin → AKI. CK in the tens of thousands = flood the kidneys with fluids.
Long-standing bipolar disorder + new confusion and seizure + dehydration from heavy exertion in the heat + AV block → lithium toxicity.
C Lithium
Lithium is a first-line mood stabilizer for bipolar disorder and has a narrow therapeutic index. Volume depletion (here from vigorous tennis in hot weather and reduced free-water intake) increases proximal sodium and lithium reabsorption, driving lithium levels up. Neurotoxicity (confusion, tremor, seizures) and cardiac conduction abnormalities such as AV block are hallmark features of toxicity. The dry mucous membranes confirm the dehydration that tipped a chronically therapeutic patient into toxicity.
Bipolar + dehydration + seizure + heart block = lithium. Volume down → lithium up.
Infertility + congenital absent left kidney + an abnormal hysterosalpingogram (banana-shaped single uterine horn) → a unicornuate uterus, which most raises the risk of preterm labor.
E Preterm labor
Renal and Müllerian structures develop together, so unilateral renal agenesis frequently coexists with uterine anomalies. The HSG showing a single, elongated horn indicates a unicornuate uterus. The reduced uterine cavity volume and abnormal musculature limit the uterus’s ability to accommodate a growing fetus, so the leading pregnancy complication is preterm labor (along with malpresentation and pregnancy loss).
One kidney missing → check the uterus. Unicornuate uterus = small horn = preterm labor and malpresentation.
New light-headedness and near-syncope with a >20 mm Hg drop in systolic BP on standing, beginning after clonidine was started 10 days ago → drug-induced orthostatic hypotension.
B Clonidine
Clonidine is a central alpha-2 agonist that lowers sympathetic outflow and blood pressure. Started for her ADHD ten days ago, it is the new variable that explains symptomatic orthostatic hypotension: light-headedness, tunnel vision, and near-falls when changing position, confirmed by the documented postural BP fall from 115/70 lying to 95/55 standing. Recognizing a temporally linked culprit medication is the key.
Clonidine = central alpha-2 agonist = sympathetic brake = orthostatic drops and near-syncope.
Former heavy smoker with absent pedal pulses and a femoral bruit but no symptoms → asymptomatic peripheral artery disease, managed first by screening/modifying cardiovascular risk.
C Serum lipid studies
Absent pedal pulses and a femoral bruit signal atherosclerotic peripheral artery disease, a marker of systemic atherosclerosis. Because she is asymptomatic (no claudication), invasive or pharmacologic claudication therapy is not warranted: the priority is global cardiovascular risk reduction. Checking serum lipids guides statin therapy, the intervention that most reduces her risk of myocardial infarction and stroke, alongside smoking-cessation reinforcement and antiplatelet therapy.
Asymptomatic PAD = window into systemic atherosclerosis. Next step = lipids + statin + stop smoking.
Patients on warfarin started on trimethoprim-sulfamethoxazole, now with INR 5.2 → a preventable drug-drug interaction.
A Review for potential drug-drug interaction
Trimethoprim-sulfamethoxazole both inhibits CYP2C9 (slowing warfarin metabolism) and displaces warfarin from protein binding, potentiating its anticoagulant effect and pushing the INR dangerously high. The “near miss” was a markedly supratherapeutic INR (5.2) with bleeding risk. Reviewing for drug-drug interactions before prescribing an interacting antibiotic, and choosing an alternative or adjusting/monitoring warfarin, would have prevented it.
Bactrim + warfarin = INR rockets (CYP2C9 inhibition). Always screen for interactions before adding antibiotics.
Obese type 2 diabetic with worsening glucose despite exercise → hyperglycemia from insulin resistance: high glucose, high insulin, decreased receptor responsiveness.
A Increased glucose, increased insulin, decreased receptor responsiveness
Type 2 diabetes is driven by peripheral insulin resistance. Tissues respond poorly to insulin (decreased receptor/post-receptor responsiveness), so glucose rises: the pancreas compensates by secreting more insulin, producing hyperinsulinemia. Thus the expected triad is increased glucose, increased insulin, and decreased insulin receptor responsiveness. Her obesity, plantar ulcer, and peripheral neuropathy all fit established, insulin-resistant type 2 disease.
Type 2 DM = resistance: glucose UP, insulin UP, receptor responsiveness DOWN.
Fever and sore throat on day 6 of trimethoprim-sulfamethoxazole with WBC 2200 and profound neutropenia (16% segs) → drug-induced agranulocytosis.
C Adverse effect of trimethoprim-sulfamethoxazole
Sulfonamides are a classic cause of drug-induced neutropenia/agranulocytosis. The differential shows leukopenia with a strikingly low absolute neutrophil count and relative lymphocytosis, and the patient presents with fever and pharyngitis (an infection breaking through because of the neutropenia) during TMP-SMX therapy. The temporal link to the offending drug makes adverse drug effect the best explanation: stopping the agent is key.
Sulfa drug + new fever/sore throat + neutropenia = drug-induced agranulocytosis. Stop the drug.
Fibular (lateral malleolar) tenderness with inability to bear weight = positive Ottawa ankle rule → x-ray the ankle: the knee exam is benign (negative Lachman, stable, full ROM) → no knee imaging.
C No diagnostic testing indicated (knee): X-ray (ankle)
The Ottawa ankle rules mandate radiographs when there is bony tenderness at the posterior edge/tip of either malleolus or inability to bear weight: this patient has distal fibular tenderness, so the ankle warrants an x-ray to exclude fracture. The knee, by Ottawa knee/Pittsburgh criteria, shows no concerning findings: stable ligaments, full range of motion, negative Lachman, only mild joint-line tenderness, so no knee imaging is required. Applying decision rules avoids unnecessary radiographs.
Ottawa ankle: malleolar bone tenderness or can’t bear weight = x-ray. Clean knee exam = no film.
Lifelong short stature, delayed puberty, height like a 9½-year-old, with a family history of late puberty → assess skeletal maturity with a bone-age film.
C X-rays of the left hand and wrist
In a child being evaluated for short stature and pubertal delay, the single most useful initial study is a left hand and wrist radiograph to determine bone age. Comparing bone age to chronologic age distinguishes constitutional growth delay (delayed bone age, often with a family history of “late bloomers”) from pathologic causes, and guides further testing. It is cheap, low-risk, and high-yield as the next diagnostic step.
Short stature work-up starts with the hand: left hand/wrist film = bone age.
A growing lump at an ear-piercing site appearing months after the procedure (photo of a shiny, rubbery nodule extending beyond the wound) → keloid, treated first with corticosteroid injection.
A Corticosteroid injection
A keloid is exuberant scar tissue that grows beyond the original wound margins, classically after ear piercing in predisposed individuals. First-line treatment is intralesional corticosteroid injection (e.g., triamcinolone), which flattens the lesion by suppressing collagen synthesis and fibroblast proliferation, with low morbidity. It is preferred initial therapy because surgical options carry a high recurrence rate.
Keloid grows past the wound edge. First shot = intralesional steroid (cutting it out makes it worse).
Blunt chest trauma with decreased right breath sounds, hypoxia, anemia (Hgb 10), and a chest film showing opacification/effusion on the right → hemothorax, treated with a chest tube.
F Tube thoracostomy
A restrained driver with right-sided decreased breath sounds, hypoxemia, and a dropping hemoglobin after blunt trauma has a hemothorax (blood in the pleural space), shown as layering opacity on the chest x-ray with a midline trachea. The definitive initial management is tube thoracostomy, which drains the blood, re-expands the lung, and lets you quantify ongoing bleeding to decide if thoracotomy is needed.
Trauma + white-out one hemithorax + falling Hgb = hemothorax = chest tube first.
Subacute non-bloody diarrhea and weight loss after drinking untreated pond/spring water on a camping trip, with a stool smear showing pear-shaped flagellates → Giardia lamblia.
E Giardia lamblia
Giardia is the classic waterborne protozoan acquired from untreated freshwater (streams, ponds). It causes prolonged, non-bloody, foul, often fatty diarrhea with bloating and weight loss from malabsorption, exactly this 3-month course. The stool smear shows the characteristic pear-shaped binucleate trophozoites with flagella (or oval cysts). Treatment is metronidazole or tinidazole.
Camping + untreated water + chronic greasy diarrhea + weight loss + pear-shaped flagellate = Giardia.
Breast cancer rate 1 per 1000 woman-years on SERM vs 3.6 per 1000 on placebo → ARR = 3.6 – 1 = 2.6.
B 2.6
Absolute risk reduction is simply the difference between the event rates in the control and treatment groups. Using the provided rates per 1000 woman-years: placebo 3.6 minus SERM 1.0 equals 2.6 per 1000 woman-years. This is the additional invasive breast cancers prevented per 1000 woman-years by the SERM.
ARR = control rate – treatment rate. Here 3.6 – 1.0 = 2.6 per 1000 woman-years.
Hematemesis (bright red blood) with early satiety and epigastric tenderness, hemodynamically stabilizing → upper GI bleed, evaluated with esophagogastroduodenoscopy.
E Esophagogastroduodenoscopy
Vomiting bright red blood localizes the source to the upper GI tract (proximal to the ligament of Treitz). After resuscitation with IV fluids and NG lavage, the definitive next step is EGD, which is both diagnostic (identifying ulcer, mass, varices) and therapeutic (allowing hemostasis). Her early satiety raises concern for a gastric malignancy, another reason endoscopy is essential.
Hematemesis = upper GI bleed = resuscitate, then EGD (it both finds and fixes the source).
EGD of a hematemesis patient shows an actively bleeding lesion (visible vessel/oozing ulcer) → apply endoscopic hemostatic therapy.
D Endoscopic hemostatic therapy
When endoscopy reveals an actively bleeding or high-risk lesion (visible vessel, adherent clot, oozing ulcer), the immediate next step is endoscopic hemostasis, using injection (epinephrine), thermal coagulation, and/or clips to stop the bleeding. Controlling active hemorrhage takes priority before any other management.
See active bleeding on EGD = treat it on the spot: inject/clip/cauterize (endoscopic hemostasis first).
Elderly bed-bound woman with a 3-cm raised, fleshy vulvar lesion and bleeding → suspected vulvar carcinoma, diagnosed by biopsy.
F Biopsy of the vulva
Any new, raised, fleshy, or persistent vulvar lesion in an older woman must be presumed malignant until proven otherwise. The diagnostic gold standard is tissue biopsy of the lesion, which establishes histology and guides staging and treatment. Bleeding from the mass underscores the urgency of obtaining tissue.
New solid vulvar lesion in an older woman = biopsy it. Don’t cream it, cut a sample.
Older man with back/leg pain and tingling brought on by standing/walking and relieved by sitting or leaning forward, with a normal ABI of 1.0 → neurogenic claudication from spinal stenosis.
D Spinal stenosis
Pseudoclaudication that comes on with standing and walking and is relieved by sitting or flexing forward is the hallmark of lumbar spinal stenosis. Flexion increases the canal diameter, relieving compression of the cauda equina, so leaning on a cart or sitting helps. A normal ankle-brachial index (1.0) excludes vascular claudication, confirming a neurogenic cause.
Walk = pain, sit/lean forward = relief, ABI normal = neurogenic claudication = spinal stenosis.
Confusion with serum sodium of 116 and clear lungs, moist mucous membranes (euvolemic) → evaluate hyponatremia by measuring urine and serum osmolality.
D Measurement of urine and plasma osmolarity
Symptomatic hyponatremia requires a systematic work-up, and the essential next step is to measure serum (plasma) and urine osmolality (plus urine sodium) to classify the cause. This patient is euvolemic, and likely has SIADH (clozapine, sertraline, and pulmonary disease are all precipitants). Confirming low serum osmolality with inappropriately concentrated urine establishes the diagnosis and directs treatment.
Low sodium work-up: first check serum and urine osmolality (and urine Na) to find the cause.
A dying patient with respiratory failure who clearly told his wife he never wanted mechanical ventilation, despite the daughter’s demand → provide palliative care only.
D Provide palliative therapy only
Even without formal paperwork, a patient’s clearly expressed prior wishes, conveyed by the appropriate surrogate (his wife), must be honored. He explicitly stated he would never want mechanical ventilation. The ethical duty is to respect his autonomy, so the correct action is to forgo intubation and provide palliative care to ensure comfort. A family member’s contrary insistence cannot override the patient’s own substituted judgment.
Clear prior wishes beat paperwork and beat a demanding relative. Respect autonomy → comfort/palliative care.
Newborn screen hemoglobin electrophoresis shows an “FS” pattern (fetal hemoglobin + only S, no A) → sickle cell disease, requiring penicillin prophylaxis.
E Penicillin prophylaxis
An FS pattern means fetal hemoglobin and hemoglobin S with no hemoglobin A, diagnostic of sickle cell disease (Hb SS). These infants develop functional asplenia and are at high risk for overwhelming infection from encapsulated organisms (especially Streptococcus pneumoniae). The proven, life-saving intervention started in infancy is daily prophylactic penicillin, along with pneumococcal vaccination.
FS on newborn screen = sickle cell disease. Asplenic risk → start penicillin prophylaxis.
Newborn screen with high TSH, and confirmatory labs showing persistently elevated TSH (14) with low free T4 (0.4) → congenital hypothyroidism, treated with levothyroxine.
B Levothyroxine therapy
Confirmed congenital hypothyroidism (elevated TSH with low free T4) demands immediate levothyroxine to prevent irreversible intellectual disability. Thyroid hormone is critical for early neurodevelopment, so treatment cannot be delayed for further imaging or watchful waiting. Prompt replacement normalizes growth and cognition.
Confirmed congenital hypothyroidism = start levothyroxine NOW (the brain can’t wait for scans).
Two months of intermittent diarrhea with acute RLQ pain, fullness, fever, and leukocytosis in a young patient → CT scan of the abdomen to evaluate the right lower quadrant.
C CT scan of the abdomen
The combination of chronic intermittent diarrhea with acute right-lower-quadrant pain, a palpable fullness/mass, low-grade fever, and leukocytosis raises concern for complicated Crohn disease (an inflammatory mass/abscess) versus appendicitis. CT of the abdomen and pelvis best characterizes bowel-wall inflammation, abscess, phlegmon, or appendiceal pathology in an adult, making it the most appropriate next diagnostic step.
Chronic diarrhea + acute RLQ mass + fever = think complicated Crohn/appendiceal process = CT abdomen/pelvis.
Third-trimester (36-week) bleeding with no prenatal care and reassuring fetal tracing → get transabdominal ultrasound to localize the placenta before any cervical exam.
E Transabdominal ultrasonography
In any third-trimester vaginal bleed, you must rule out placenta previa before performing a digital or speculum cervical examination, because a vaginal exam over a previa can provoke catastrophic hemorrhage. With no prenatal care, placental location is unknown, so transabdominal ultrasonography is the safe, essential next step. The reassuring fetal heart tracing and stable mother allow time for imaging.
Third-trimester bleeding: ultrasound FIRST, no fingers in the cervix until you’ve ruled out previa.
An alert, oriented, conversant patient who understands the trade-offs chooses home care: the son claims power of attorney → the patient with capacity makes his own decision.
A Inform the son that the decision is the patient’s to make, regardless of the medical team’s recommendation
A durable power of attorney for health care only takes effect when the patient lacks decision-making capacity. This patient is awake, alert, oriented, and clearly understands and reasons through the risks and benefits (he even acknowledges the facility offers better care but prefers home). With intact capacity, he retains the right to make his own decisions, so the son’s POA does not apply, and the team should tell the son so.
POA activates only when capacity is lost. Capable patient = patient decides, period.
Hypertensive man with acute hemiplegia and a CT showing increased attenuation (hyperdensity = blood) in the right putamen → hypertensive hemorrhage from small-vessel (lipohyalinotic) disease.
C Small vessel disease
A hyperdense (bright) lesion on noncontrast CT is acute blood, an intracerebral hemorrhage. The putamen (along with thalamus, pons, cerebellum) is the classic site for hypertensive hemorrhage. Chronic hypertension damages small penetrating arteries (lipohyalinosis, Charcot-Bouchard microaneurysms), which rupture, making small-vessel disease the underlying cause in this hypertensive patient.
Hypertension + deep putaminal bleed = small-vessel disease (Charcot-Bouchard aneurysm rupture).
Suction curettage with a homogenous white-gray discharge at pH 5.5 → bacterial vaginosis, the strongest predisposing factor for postoperative pelvic infection.
D Type of vaginal discharge
A thin, homogenous, gray-white discharge with an elevated vaginal pH (>4.5) is classic for bacterial vaginosis. BV markedly increases the risk of post-abortal/post-instrumentation endometritis and pelvic infection, so among the listed factors it is the strongest predisposing risk for postoperative infection after dilation and curettage.
Gray, homogenous discharge + pH > 4.5 = bacterial vaginosis = the big driver of post-D&C infection.
Sudden, severe great-toe pain with a photo of a red, swollen first MTP joint and serum uric acid 7.8 in a patient with risk factors (diuretic, immobility) → acute gout.
B Gout
Abrupt onset of exquisitely painful monoarthritis of the first metatarsophalangeal joint (podagra) is the textbook presentation of acute gout, caused by monosodium urate crystal deposition. Her hydrochlorothiazide (raises urate), prolonged sitting in the car, and hyperuricemia all favor gout. The classic red, hot, swollen great toe seals the diagnosis.
Sudden, fiery first-MTP pain (podagra) + diuretic + high urate = gout.
Long-standing type 1 diabetic with 3-mm ST-segment depression on stress testing and NO chest pain → silent myocardial ischemia from coronary artery disease.
C Coronary artery disease
Significant exercise-induced ST-segment depression indicates myocardial ischemia, and the most likely cause is coronary artery disease. The absence of pain is explained by diabetic autonomic neuropathy, which blunts anginal sensation, producing “silent” ischemia. Long-standing diabetes plus neuropathy makes painless CAD the best answer.
Diabetic + positive stress test + NO pain = silent ischemia = coronary artery disease (neuropathy masks angina).
Young man, previously normotensive, now hypertensive after months of drinking six beers daily → excessive alcohol use as the cause.
C Excessive alcohol use
Chronic heavy alcohol intake is a well-established, reversible cause of hypertension. This previously normotensive young man developed elevated readings coinciding with a new pattern of about six beers daily. Heavy drinking (generally more than two drinks/day) raises blood pressure, and reduction or cessation typically lowers it, making excessive alcohol the most likely cause.
New hypertension + heavy daily drinking = alcohol-induced HTN (cut the beers, drop the pressure).
Painless violaceous skin plaques on the arms with constitutional weight loss in a young man (photo of purple/brown nodular lesions) → Kaposi sarcoma, pointing to underlying HIV.
C Kaposi sarcoma
Painless, violaceous (purple-brown) papules, plaques, or nodules on the skin, accompanied by weight loss in a young adult, are characteristic of Kaposi sarcoma, an HHV-8-driven vascular tumor strongly associated with immunosuppression/AIDS. The clinical photograph of multiple reddish-purple lesions and the systemic B-symptoms make Kaposi sarcoma the most likely cause.
Painless purple plaques + weight loss in a young adult = Kaposi sarcoma = think HHV-8/HIV.
42-year-old with 6 months of amenorrhea, hot flashes, and progressive cycle lengthening → menopause/premature ovarian insufficiency, confirmed by an elevated serum FSH.
A Measurement of serum follicle-stimulating hormone concentration
Hot flashes with amenorrhea and gradually lengthening cycles indicate ovarian failure (here, early menopause). As ovarian estrogen output falls, the pituitary loses negative feedback and FSH rises. An elevated serum FSH is the most useful confirmatory test, so it is the most appropriate next diagnostic step.
Hot flashes + amenorrhea = ovarian failure → confirm with a high FSH.
A physician appears intoxicated (groggy, slurred speech, smells of alcohol) and is about to see patients → immediately remove him from patient care by reporting to the clinic administrator.
E Report the physician to the clinic administrator and conduct the remainder of the clinic hours without him
Patient safety is paramount. A physician who appears impaired must be removed from patient care immediately, and the appropriate, decisive action is to report to the clinic administrator (the responsible authority) and cover the patients so no one is harmed. This both protects patients now and triggers proper institutional handling of the impaired colleague.
Impaired doctor = remove from care immediately + notify the administrator + cover the patients.
Isolated proteinuria during a UTI work-up now fully resolved on repeat urinalysis (protein negative) in a healthy, fit patient → transient proteinuria, no further testing needed.
E No additional testing is indicated
The original proteinuria occurred in the setting of a urinary tract infection, a common cause of transient (functional) proteinuria. Now that the infection has resolved and a repeat urinalysis is completely normal (protein negative, no cells), the proteinuria was benign and transient. No further evaluation is warranted.
Proteinuria during a UTI that clears on repeat = transient/benign = stop testing.
Rapidly worsening leg pain after a minor scratch, with cellulitis, hemorrhagic bullae, and pain out of proportion plus early shock → necrotizing fasciitis, requiring emergent surgical debridement.
D Surgical debridement
Hemorrhagic bullae, rapidly spreading cellulitis, severe pain, and systemic signs (tachycardia, borderline hypotension) after a minor wound signal necrotizing soft-tissue infection (necrotizing fasciitis). This is a surgical emergency: survival depends on immediate, aggressive surgical debridement of necrotic tissue in addition to broad-spectrum antibiotics and resuscitation. Imaging must not delay the operation.
Hemorrhagic bullae + pain out of proportion + sick = necrotizing fasciitis = to the OR for debridement.
Obese woman with prior macrosomic infants (>4000 g), strong family history of diabetes, and high-risk ethnicity → screen early in pregnancy with a glucose tolerance test.
C Fasting glucose tolerance test
This patient carries multiple major risk factors for diabetes in pregnancy: marked obesity (BMI 38), two prior macrosomic infants, and a strong family history. Such high-risk women should undergo glucose screening at the first prenatal visit (early), rather than waiting until 24–28 weeks, to detect undiagnosed pregestational or early gestational diabetes. Hence early glucose tolerance testing is the most appropriate next step.
Macrosomic babies + obese + family history = screen for diabetes EARLY in pregnancy (don’t wait for 24-28 weeks).
Older woman with malaise, self-neglect (unkempt), missed appointments, and worsening diabetes control since her unemployed son moved in, with intact cognition and a clean urinalysis → elder neglect.
B Elder neglect
This unkempt, fully oriented elderly woman with no memory deficit has had deteriorating self-care, missed appointments, and worsening diabetes control since her unemployed son moved in. The picture of inadequate care of a vulnerable elder, without a cognitive or primary mood explanation accounting for the decline, raises elder neglect (a form of elder mistreatment) as the most likely diagnosis. Physicians must recognize and act on signs of mistreatment in dependent older adults.
Unkempt dependent elder + worsening control + new dependent caregiver in the home = think elder neglect.
Adolescent in New Jersey with peripheral (forehead-involving) facial palsy, meningismus, and CSF lymphocytic pleocytosis → Lyme disease, confirmed by Borrelia serology.
B Measurement of serum Lyme (Borrelia burgdorferi) antibody concentration
A peripheral seventh-nerve palsy (the forehead does not wrinkle, eye won’t close) combined with lymphocytic meningitis (CSF WBC 85, lymphocyte predominant, normal glucose, mildly high protein) in a patient living in Lyme-endemic New Jersey is classic neuroborreliosis. The most appropriate next diagnostic step is serum Lyme antibody testing (ELISA with Western blot confirmation).
Facial palsy (forehead involved) + lymphocytic meningitis + endemic area = Lyme → send Borrelia serology.
Toddler with barky cough, hoarse voice, inspiratory stridor at rest, and retractions after a viral prodrome → moderate-to-severe croup, treated with nebulized (racemic) epinephrine.
D Nebulized epinephrine
This is laryngotracheobronchitis (croup), most often parainfluenza, producing a seal-like barking cough, hoarseness, and inspiratory stridor. With stridor at rest plus suprasternal/subcostal retractions, this is moderate-to-severe disease, and the appropriate initial pharmacotherapy to rapidly reduce airway edema is nebulized epinephrine, which provides fast vasoconstriction and symptomatic relief (corticosteroids are also given but act more slowly).
Barky cough + stridor at rest = moderate/severe croup → nebulized epinephrine (plus steroids).
Mixed clinical disciplines, pharmacology, prevention, and management.
Post-trauma patient with bloody urine that abruptly drops from 40 mL/h to 5 mL/h → the Foley is plugged by a clot, not true oliguria.
D Ultrasonography of the bladder
This man had a renal injury and is producing grossly bloody urine, so clot formation in the catheter is the predictable culprit when output suddenly falls. Before chasing hypovolemia, hemorrhage, or a surgical disaster, you must confirm whether urine is actually being made and simply not draining. Bladder ultrasonography rapidly shows a distended, clot-filled bladder, telling you to irrigate or replace the catheter rather than rush to the OR or CT. It is the cheapest, fastest, bedside next step that distinguishes obstruction from oliguria.
Sudden drop in bloody urine output = check the catheter first (bladder scan), not the kidneys.
Physician sees four gastroenteritis cases, then labels a fifth complex patient “gastroenteritis” without full workup → premature closure.
D Premature closure
Premature closure is settling on a diagnosis before it is fully verified and failing to consider alternatives. The physician anchored on the day’s pattern of gastroenteritis and attributed the tachycardia to dehydration, ignoring red flags, situs inversus and scoliosis raising volvulus risk, and a sick wheelchair-bound child examined hastily. He stopped thinking once about a convenient label fit. This is a classic cognitive error, not a system or equipment failure.
Premature closure = “I’ve decided” too early, the mind shuts the door before all doors are checked.
Major depression in a man whose epilepsy is controlled on levetiracetam → pick the antidepressant that won’t drop the seizure threshold.
E Mirtazapine
This patient meets criteria for major depressive disorder (depressed mood, insomnia, anhedonia, poor concentration, fatigue for a month). The catch is his epilepsy: you want an antidepressant with a favorable seizure profile. Mirtazapine, an SSRI, or an SNRI are reasonable, and among the listed options mirtazapine is the safest seizure-wise: its sedating, appetite-stimulating effects even help his insomnia. It does not meaningfully provoke seizures at therapeutic doses.
Depression + seizures? Avoid bupropion: mirtazapine is the safe, sleep-and-appetite-friendly pick.
Infertility plus prior PID and ruptured appendix, with HSG showing blocked/scarred tubes → tubal-factor (female) infertility.
A Female factor infertility
Her history screams tubal damage: pelvic inflammatory disease and a ruptured appendix both scar the fallopian tubes. She ovulates normally (regular menses, mittelschmerz), so the bottleneck is tubal patency. The hysterosalpingogram classically shows absent or blocked spillage of contrast from the tubes, hydrosalpinx or occlusion. Without intervention (IVF or surgical repair), she is unlikely to conceive naturally, defining female-factor infertility.
PID + ruptured appendix = scarred tubes on HSG = tubal (female-factor) infertility.
Screening mammogram showing clustered pleomorphic microcalcifications in a small area → DCIS until proven otherwise.
A Ductal carcinoma in situ
Clustered, pleomorphic (varied size and shape) microcalcifications confined to a small region are the textbook mammographic signature of DCIS, malignant ductal cells that have not breached the basement membrane. The lesion is non-palpable, so it was found purely by imaging, which is typical. Stereotactic core biopsy confirms the diagnosis. Recognizing this pattern as suspicious for malignancy is the high-yield point.
Clustered, pleomorphic microcalcifications = DCIS.
Only 34% adherence to annual PFT in asthmatics, which intervention best closes the gap → point-of-care reminders in the chart.
B Diagnosis-driven reminders in patient charts
Adherence to a clinical standard improves most when the prompt reaches the physician at the moment of decision-making. Diagnosis-driven (point-of-care) reminders embedded in the chart flag the asthmatic patient and cue the physician to order the PFT during that very visit, making the right action the easy default. This active, just-in-time nudge consistently outperforms passive or retrospective measures.
Want the order placed? Put the reminder where and when the decision happens, point-of-care chart prompts.
Breast-feeding mother with poor latch, fever, and a wedge-shaped tender erythema → bacterial mastitis needing antibiotics, not cessation.
B Dicloxacillin therapy
A focal, wedge-shaped area of erythema and tenderness with fever three weeks postpartum in a nursing mother is lactational mastitis, usually from Staphylococcus aureus introduced through cracked nipples and worsened by milk stasis from poor latch. Treatment is an antistaphylococcal antibiotic such as dicloxacillin (or cephalexin) plus continued breast-feeding/pumping to drain the breast. Stopping nursing worsens stasis.
Postpartum tender wedge of redness + fever = mastitis → dicloxacillin and keep nursing.
12-year-old, no breast budding, no pubic hair, slightly short, still within normal timing → reassurance, no workup yet.
E No additional diagnostic steps are indicated
At 12 with Tanner stage 1 breasts and no pubic hair, this girl is still within the normal window, puberty in girls can begin up to age 13, and lack of secondary sexual characteristics at 12 is not yet “delayed.” She feels well and has no concerning findings. The most appropriate step is reassurance and routine follow-up rather than launching a hormonal or imaging workup prematurely.
Tanner 1 at age 12 is still normal, reassure: only call it delayed if no breasts by 13.
Hypoglycemic spells are relieved by eating, with high insulin but LOW C-peptide → exogenous insulin (factitious), so the pancreas is normal.
E No abnormalities
This is the trap of distinguishing insulinoma from factitious hypoglycemia. The patient has Whipple triad, but her insulin is high (80) while her C-peptide is inappropriately LOW (0.5). Endogenous insulin from an insulinoma is co-secreted with C-peptide, so both would be high. High insulin with suppressed C-peptide means the insulin is exogenous, surreptitious injection. Therefore the pancreatic CT shows no tumor.
High insulin + LOW C-peptide = exogenous insulin = factitious: the pancreas is clean.
Keeping the whole ICU team on the same page about diagnosis, prognosis, and plan → structured briefings plus daily huddles.
A Conduct weekly structured team briefings and daily huddles
A “common mental model” is sustained by frequent, structured, whole-team communication where everyone hears the same updated picture simultaneously. Daily huddles refresh the shared understanding of each patient’s diagnosis, prognosis, and plan, while periodic structured briefings align the larger team. This collective, synchronous sharing lets the team spot when new data deviate from expectations.
Same page for everyone = huddles and briefings, the team’s synchronized situational refresh.
12-month-old girl, first febrile UTI (E. coli) → image the urinary tract with renal-bladder ultrasonography.
D Ultrasonography of the kidneys and bladder
After a first febrile UTI in a child 2-24 months, guidelines recommend renal and bladder ultrasonography to screen for anatomic abnormalities, hydronephrosis, or obstruction. It is noninvasive and the appropriate initial imaging. VCUG is reserved for abnormal ultrasound findings or recurrent febrile UTIs, it is not the routine first step after a single episode.
First febrile UTI in a toddler → renal-bladder ultrasound first: VCUG only if it’s abnormal.
Weeks of paroxysmal coughing fits with post-tussive emesis after a “cold” → pertussis → treat with a macrolide.
B Azithromycin
This adult has classic pertussis: a catarrhal prodrome (runny nose, malaise) gave way to a paroxysmal stage of severe coughing bursts with post-tussive vomiting, all without fever or abnormal lung findings. Bordetella pertussis is the cause, and the treatment of choice is a macrolide, azithromycin, which shortens infectivity and limits spread even though it may not dramatically alter the cough once paroxysms are established.
Cold, then weeks of coughing fits + post-tussive vomiting = pertussis → azithromycin.
CF patient with a typical pulmonary exacerbation → get a sputum culture to target antibiotics.
D Sputum culture
In a cystic fibrosis exacerbation you start empiric broad-spectrum antibiotics, but the most important parallel step is obtaining a sputum culture and sensitivities. CF airways harbor evolving organisms (Pseudomonas aeruginosa, Staphylococcus aureus, Burkholderia), and culture-directed therapy tailors and de-escalates antibiotics for this and future flares. It is cheap, essential, and changes management.
CF exacerbation = empiric antibiotics PLUS a sputum culture to aim them.
EXT1 mutation + metaphyseal bony “polyps” pointing away from the joint, unchanged over time → benign osteochondromas: treat the injury, no special workup.
E Recommendation to bear weight as tolerated: no further workup needed
EXT1 mutation causes hereditary multiple exostoses, benign osteochondromas at the metaphyses. The lesions classically point away from the nearby joint and have been radiographically stable for six months, confirming a benign, non-aggressive process. His exam shows only superficial abrasions with no effusion or instability, so this is a minor skateboarding injury. Manage symptomatically: bear weight as tolerated, no biopsy or MRI needed.
EXT1 + stable bony spurs pointing away from the joint = osteochondroma, reassure, weight-bear, no workup.
A 70-year-old with sudden painless bright-red rectal bleeding → diverticulosis is the most common source.
C Diverticulosis
Acute, painless, large-volume hematochezia in an older adult is most commonly from diverticulosis, where a vessel at the neck of a diverticulum ruptures. The bleeding is abrupt, bright red, and self-limited, with no pain and no hemodynamic collapse here. It is the single most common cause of major lower GI bleeding in this age group.
Older adult + painless, brisk, bright-red rectal bleeding = diverticulosis.
14-year-old bonding with a new peer group, inside jokes, curfew battles, secrecy, but no real pattern of rights-violating delinquency → normal adolescence.
E Normal development
Pulling away from parents, intense peer affiliation, secrecy, and arguing about curfew are hallmarks of normal adolescent individuation. The trespassing was a one-time group exploit without aggression toward people or animals, no destruction pattern, and a negative tox screen. There is no persistent, pervasive violation of others’ rights, so no disorder is warranted, this is developmentally expected behavior.
Peer group, secrecy, curfew fights without rights-violations = normal teenage development.
Child with acute colicky flank pain, gross hematuria, and ultrasound hydronephrosis/hydroureter → confirm the stone with CT.
B CT scan of the abdomen and pelvis
The colicky flank pain with vomiting, 4+ blood and many RBCs on dip, plus ultrasound showing hydronephrosis and hydroureter to the bladder all point to an obstructing ureteral calculus. After the screening ultrasound, non-contrast CT of the abdomen and pelvis is the most sensitive study to confirm the stone, locate it, and size it to guide management.
Colicky flank pain + hematuria + hydronephrosis = stone → confirm with non-contrast CT.
Young lumber-mill worker (moldy wood/organic dust) with weeks of cough, weight loss, crackles, upper-lobe reticulonodular x-ray, and a mixed PFT pattern → hypersensitivity pneumonitis.
C Hypersensitivity pneumonitis
Exposure to organic antigens, here moldy wood dust at a lumber mill (“woodworker’s lung”), drives an immune-mediated interstitial lung disease. Subacute presentation with malaise, dry-to-productive cough, weight loss, diffuse crackles, an upper-lobe-predominant reticulonodular pattern, and mixed obstructive/restrictive PFTs fits hypersensitivity pneumonitis. Antigen avoidance is the key intervention.
Moldy organic dust (lumber mill) + upper-lobe reticulonodular ILD = hypersensitivity pneumonitis.
“Seizures” with side-to-side head movements, eye closure, crying, long duration, intermittent responsiveness, drug-refractory, abuse history, and NORMAL EEG during events → psychogenic nonepileptic seizures.
A Cognitive behavioral therapy
Events with side-to-side head shaking, eye closing, crying, prolonged duration, preserved/fluctuating awareness, resistance to multiple antiepileptics, and, decisively, no EEG correlate during captured episodes diagnose psychogenic nonepileptic seizures (a conversion/functional disorder), strongly linked to her childhood abuse. First-line evidence-based treatment is cognitive behavioral therapy, not more antiepileptics or surgery.
Long “seizures,” eyes shut, crying, normal EEG, trauma history = PNES → CBT.
Cleft palate + conotruncal VSD + recurrent infections in an adopted toddler → DiGeorge syndrome with thymic hypoplasia → T-cell lymphopenia.
C Lymphopenia
The triad of conotruncal cardiac defects (VSD), cleft palate, and recurrent infections (pneumonias, otitis media) signals 22q11.2 deletion (DiGeorge) syndrome. Failure of the third/fourth pharyngeal pouches causes thymic hypoplasia, impairing T-cell development. The CBC therefore shows lymphopenia (low T cells), explaining the recurrent infections. The chest x-ray classically lacks a thymic shadow.
Cleft palate + heart defect + infections = DiGeorge = no thymus = lymphopenia (low T cells).
Rh-negative gravida at 28 weeks with a newly positive but unmeasurably weak anti-D (residual passive antibody) → give the scheduled Rh immune globulin.
C Administration of Rh (D) immune globulin
She is O Rh-negative and at 28 weeks, the routine antepartum window for RhoGAM. The faintly positive anti-D is the expected passive antibody from her prior immunoprophylaxis or simply not yet a clinically significant active titer. The appropriate step at 28 weeks is to give the scheduled Rh(D) immune globulin to continue preventing alloimmunization, since there is no evidence of clinically significant active sensitization.
Rh-negative mom at 28 weeks with a trivial anti-D = give scheduled RhoGAM.
Summer picnic, then itchy grouped vesicular rash on exposed skin (forearm, cheek, ankle) → contact dermatitis from a plant (urushiol/flora).
B Flora
A pruritic vesicular eruption appearing on sun-exposed, brush-contacting areas a few days after an outdoor picnic is classic allergic contact dermatitis from plants such as poison ivy/oak (urushiol). The lesions on the forearm, cheek, and ankle map to where skin brushes against foliage. Avoiding the offending plant (flora) would have prevented it.
Outdoor exposure + itchy vesicles on brushed skin = plant (flora) contact dermatitis.
Marked leukocytosis (67,000) with a full left-shifted myeloid spectrum (metamyelocytes, myelocytes), basophilia, and splenomegaly → CML.
D Chronic myeloid leukemia
A very high WBC count with the entire spectrum of maturing granulocytes (neutrophils, metamyelocytes, myelocytes), basophilia, and massive splenomegaly (early satiety, splenic dullness, palpable liver/spleen below the costal margin) is the signature of chronic myeloid leukemia, driven by the BCR-ABL Philadelphia chromosome. The smear shows myeloid cells at all stages of maturation rather than a single blast population.
Huge WBC + every myeloid stage + basophilia + big spleen = CML (BCR-ABL).
Heavy smoker with chronic dyspnea, wheeze, prolonged expiration → confirm suspected COPD with spirometry/PFTs.
E Pulmonary function testing
A 50-pack-year smoker with progressive exertional then rest dyspnea, nonproductive cough, end-expiratory wheezes, and a prolonged expiratory phase has clinical COPD. The next diagnostic step to confirm airflow obstruction and establish the diagnosis is pulmonary function testing (spirometry), which demonstrates a reduced FEV1/FVC ratio. It directly answers the clinical question and guides therapy.
Suspected COPD in a smoker = confirm with spirometry (PFTs).
Job-loss-related anxiety, insomnia, and edginess in a sober alcoholic who “wants a drink” → pick a non-addictive anxiolytic: buspirone.
A Buspirone
This man has anxiety symptoms (nervousness, tension, fitful sleep) tied to unemployment, with a history of alcohol use disorder and craving. The crucial point is choosing pharmacotherapy without dependence potential. Buspirone is a non-sedating, non-addictive anxiolytic, ideal in a patient with substance use history, so it relieves anxiety without the relapse/abuse risk of benzodiazepines.
Anxiety + addiction history = buspirone (non-addictive), never a benzo.
Middle-aged man physically acting out vivid dreams (punching, kicking) during sleep → REM sleep behavior disorder → future synucleinopathy (Parkinson).
E Parkinson disease
Loss of normal REM atonia lets the patient enact dreams, throwing, kicking, punching, yelling, with recall of the dream when awakened. REM sleep behavior disorder is a strong prodromal marker of alpha-synucleinopathies: a large fraction of patients later develop Parkinson disease (or dementia with Lewy bodies/multiple system atrophy). That neurodegenerative link is the high-yield association.
Acting out dreams (RBD) = synucleinopathy alarm → Parkinson disease ahead.
Demented, dependent elder with unexplained fracture, multiple bruises, neglect signs and a sole caregiver → suspected elder abuse → contact APS.
C Contact adult protective services
A vulnerable adult with advanced dementia, an unexplained distal radius fracture, multiple bruises over both forearms, poor hygiene, and total dependence on one caregiver raises clear suspicion of elder abuse and neglect. Physicians are mandated reporters: once the acute injury is treated, the most appropriate next step is to contact adult protective services to investigate and protect the patient.
Unexplained injury + neglect in a dependent elder = suspect abuse = report to APS.
Young man with new heart failure (S3, edema, orthopnea) plus severe gingivitis → solvent (toluene) inhalant abuse causing cardiomyopathy.
E Toluene
A 27-year-old with subacute congestive heart failure: orthopnea, paroxysmal nocturnal dyspnea, S3 gallop, bibasilar crackles, 3+ edema, plus striking diffuse gingivitis points to chronic inhalant (toluene/solvent “huffing”) abuse. Toluene is cardiotoxic, causing dilated cardiomyopathy, and the perioral/dental destruction and gingivitis are tell-tale clues of solvent sniffing.
Young dilated cardiomyopathy + severe gingivitis = toluene (huffing) cardiotoxicity.
Episodic headache, palpitations, sweating with hypertension and an adrenal mass → pheochromocytoma → confirmed with plasma/urine metanephrines.
D Measurement of plasma and urine catecholamine and metabolite concentrations
The triad of episodic headaches, palpitations, and diaphoresis with paroxysmal hypertension and a 4-cm adrenal mass is classic pheochromocytoma. Before any surgery, you must biochemically confirm catecholamine excess by measuring plasma free metanephrines and/or 24-hour urine catecholamines and metanephrines. Diagnosis precedes localization and resection (and mandates preoperative alpha-blockade).
Headache-palpitations-sweating + adrenal mass = pheo → confirm with plasma/urine metanephrines first.
Recurrent alcoholic pancreatitis → the modifiable driver of readmission is alcohol abstinence.
A Abstinence from alcoholic beverages
Her pancreatitis is alcohol-induced with three prior admissions: the single intervention most likely to prevent future episodes and hospitalizations is stopping alcohol, the direct cause of recurrent pancreatic injury. Abstinence (with referral to treatment) removes the proximate trigger, whereas the other supports, while valuable, don’t address the etiology of the pancreatitis itself.
Recurrent alcoholic pancreatitis, nothing beats stopping the alcohol.
Child in Florida heat with tiny clear non-inflamed “water-droplet” vesicles that rupture easily → miliaria crystallina → heat/sweat avoidance.
B Heat avoidance
Superficial 1-2 mm clear vesicles resembling dewdrops, rupturing with light pressure and lacking surrounding erythema, in a child exposed to high heat are miliaria crystallina, blocked superficial eccrine ducts trapping sweat just under the stratum corneum. It is benign and self-limited: the treatment is cooling and avoiding heat and excessive sweating.
Clear “dewdrop” vesicles, no redness, hot climate = miliaria crystallina → cool off.
Major depression after a recent MI → known to roughly double cardiac mortality.
B It is likely to double her risk for death during the next 3 months
Depression following myocardial infarction is not benign: it independently and substantially increases cardiac and all-cause mortality, roughly doubling the risk in the months after the event through poor adherence, autonomic dysregulation, and reduced rehabilitation participation (as her dropping attendance shows). Recognizing and treating post-MI depression is therefore prognostically important, not merely a quality-of-life issue.
Depression after MI roughly doubles mortality, screen and treat it.
Older man with years of dysphagia and regurgitation of UNDIGESTED food, now aspiration pneumonia → Zenker diverticulum.
D Zenker diverticulum
Long-standing dysphagia with spontaneous regurgitation of undigested food and liquids, unresponsive to antacids, and complicated by aspiration pneumonia is the classic story of a Zenker (pharyngoesophageal) diverticulum. A pulsion outpouching at Killian triangle traps food, which later regurgitates and is aspirated, explaining his right-lower-lobe pneumonia. Barium swallow confirms it.
Years of regurgitating UNDIGESTED food + aspiration = Zenker diverticulum.
Young woman with mild left-sided pain, an adnexal cyst, and a little free fluid, hemodynamically stable, negative pregnancy test → ruptured ovarian cyst → observe.
E Observation only
A 27-year-old with mild left lower quadrant pain, a 3 × 4-cm adnexal cyst, and a small amount of free pelvic fluid, who is afebrile, stable, and not pregnant, most likely has a ruptured functional ovarian cyst (timing near ovulation). With stable vitals and minimal fluid, management is expectant, analgesia and observation, since most resolve spontaneously without surgery.
Stable woman + small ruptured ovarian cyst + scant free fluid = observe.
Incidental cerumen filling the canals in a woman who hears well and has no symptoms → leave it alone.
E No further management is indicated at this time
Cerumen impaction warrants removal only when it causes symptoms (hearing loss, pain, tinnitus) or prevents needed examination/management. This woman hears well, has no complaints, and there is no clinical need to inspect the tympanic membranes urgently. So removing wax solely because it is present is unnecessary, no intervention is indicated.
Asymptomatic earwax that doesn’t block needed care = do nothing.
Postop patient with pleuritic chest pain, hemoptysis, and a triangular pleural-based density, classic Hampton hump, with no large-vessel clot seen → pulmonary infarction from a small distal PE.
H Pulmonary infarction
Four days postop (a high-VTE-risk state), she has acute pleuritic chest pain and blood-streaked sputum with a wedge-shaped, pleural-based opacity (Hampton hump) in the lower lobe. Even though no clot is seen in major branches and duplex shows no DVT, a small distal embolus can infarct the lung, producing exactly this triangular, pleura-based density and hemoptysis. The radiographic-clinical picture defines pulmonary infarction.
Postop pleuritic pain + hemoptysis + wedge-shaped pleural density (Hampton hump) = pulmonary infarction.
Elderly heavy-smoker man with sudden severe abdominal pain, hypotension, and diminished femoral/absent pedal pulses → ruptured AAA.
D Ruptured abdominal aortic aneurysm
An older male smoker (the prime AAA demographic) with abrupt severe abdominal pain, hypotension (80/60), tachycardia, and reduced groin/absent pedal pulses is presenting with a ruptured abdominal aortic aneurysm until proven otherwise. The abdominal film may show a calcified, dilated aortic contour. This is a surgical emergency: hemorrhagic shock from rupture explains the hypotension and poor distal perfusion.
Old male smoker + sudden abdominal pain + hypotension + pulse deficits = ruptured AAA.
Repaired lumbosacral myelomeningocele with absent lower-extremity movement → the cord/sacral nerve damage causes neurogenic bladder.
D Neurogenic bladder
Myelomeningocele damages the sacral spinal cord and nerve roots controlling the lower limbs and bladder. This newborn already has flaccid lower extremities (no movement, normal upper-extremity Moro). The same sacral dysfunction almost universally produces a neurogenic bladder, which threatens renal function and requires lifelong bladder management, the most likely associated finding.
Myelomeningocele = sacral cord damage = neurogenic bladder (and lower-limb paralysis).
Trial measured fewer VT episodes, but authors claim a MORTALITY benefit they never tested → extrapolation beyond the data.
A Extrapolation of findings beyond data
The study’s measured outcome was the frequency of recurrent ventricular tachycardia, not death. Concluding that the drug “decreases mortality from cardiac arrhythmia” asserts a benefit the trial never assessed, a surrogate-to-clinical-endpoint leap. Reducing arrhythmia episodes doesn’t guarantee reduced mortality (antiarrhythmics can even increase death, as in CAST). This invalid generalization beyond the collected data is the flaw.
Measured arrhythmia, claimed mortality = extrapolating beyond the data (surrogate is not the outcome).
Painful, tender anterior neck/thyroid with low-grade fever and mild hyperthyroid signs after a viral-type illness → subacute thyroiditis.
D Subacute thyroiditis
Tender, painful fullness of the anterior neck over the thyroid with low-grade fever, tachycardia, anxiety, and mild systemic hyperthyroid symptoms (the inflamed gland leaks stored hormone) is classic subacute (de Quervain) granulomatous thyroiditis, typically post-viral. The neck pain/tenderness localizing to the thyroid distinguishes it: treatment is NSAIDs (or steroids) and it is usually self-limited.
Painful, tender thyroid + fever + mild hyperthyroidism after a virus = subacute (de Quervain) thyroiditis.
See how to fold every missed memory hook into a structured, IMG-focused Step 2 CK prep schedule, free.
That is all 120 items of the NBME Free 120 Step 2, fully explained. If you worked each block under timed conditions before reading these step 2 free 120 answer explanations, you now have a precise map of where your clinical reasoning is solid and where it still leans on recall. Convert every missed memory hook into a flashcard, re-test the weak block in a week, and you will feel the difference on test day, the questions will start to feel like reasoning problems you have already solved.
This guide was prepared by IMG Helping Hands Corp to give international medical graduates and all USMLE test-takers a clean, high-yield reference for the official sample questions. Good luck! You have got this.
No single resource is enough on its own. Pair it with a question bank for volume and a full Step 2 CK study strategy and resource plan, and use the Free 120 to rehearse pacing and confirm your reasoning.
The Free 120 is a sample of real exam style and difficulty, but it is not a scored, normed practice exam, so it does not produce a three-digit prediction. Use the official NBME Step 2 CK practice exams (the paid forms) for score estimates, and use the Free 120 to find and fix reasoning gaps.
Download it free from the official USMLE website on the Step 2 CK materials page (usmle.org). Always practice on the interactive online version too, since it includes formats, such as audio items, that do not appear in the printable PDF.
Yes. Give yourself a maximum of one hour per 40-question block before checking answers. For where timed practice exams fit across the whole journey, see our USMLE Steps 1, 2 & 3 study schedule.
No. The question text belongs to the NBME and FSMB: the explanations here are original teaching commentary written by IMG Helping Hands Corp to help you understand the reasoning. They are not endorsed by or affiliated with the NBME or USMLE.
Note: This is an independent study guide. USMLE and Step 2 CK are registered trademarks of the FSMB and NBME, which neither sponsor nor endorse this material. Question text belongs to the NBME/FSMB: the explanations here are original teaching commentary. Always confirm management with current clinical guidelines.
IMG HELPING HANDS – USMLE STEP 2 CK PREP
The Free 120 shows you where your clinical reasoning is solid and where it still leans on recall. IMG Helping Hands helps international medical graduates close those gaps the same way this guide does, clue first, mechanism second, management third, so Step 2 CK questions start to feel like problems you’ve already solved.
Reasoning-based teaching. Block-by-block weak-spot targeting. IMG mentors who’ve matched. An honest study plan.
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