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Question 1721Question →

Match the following cardiovascular pathologies with their most characteristic right and left heart catheterization hemodynamic findings.

Click a left item, then click its matching right item

Items

Cardiac tamponade
Constrictive pericarditis
Restrictive cardiomyopathy
Acute severe mitral regurgitation
Massive pulmonary embolism

Matches

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Answer

Cardiac tamponade matches with equalization of diastolic pressures and a blunted y-descent. Constrictive pericarditis matches with equalization of pressures, prominent y-descent, and dip/plateau sign. Restrictive cardiomyopathy matches with LVEDP > RVEDP by > 5 mm Hg. Acute severe mitral regurgitation matches with prominent v-waves in the PCWP tracing. Massive pulmonary embolism matches with elevated right-sided pressures and normal/low PCWP.
Hemodynamic monitoring via right and left heart catheterization provides distinct waveforms and pressure readings that are highly diagnostic for specific cardiovascular pathologies. Understanding the physiological basis for these pressure changes allows for accurate matching of each condition to its exact hemodynamic profile.

Step-by-Step Solution

1
Analyze the hemodynamic profile of cardiac tamponade.
Fluid in the pericardial space compresses all chambers uniformly, equalizing diastolic pressures and blunting the y-descent due to restricted early filling.
To identify the matching right item for cardiac tamponade.
2
Analyze the hemodynamic profile of constrictive pericarditis.
A rigid pericardium allows rapid early filling (sharp y-descent) but abruptly halts it (dip and plateau), with equalization of diastolic pressures.
To identify the matching right item for constrictive pericarditis.
3
Analyze the hemodynamic profile of restrictive cardiomyopathy.
Stiff myocardium restricts filling. LVEDP is typically greater than RVEDP by >5 mm Hg because the left ventricle is thicker and less compliant than the right.
To differentiate restrictive cardiomyopathy from constrictive pericarditis.
4
Analyze the hemodynamic profile of acute severe mitral regurgitation.
Backward flow into a normal-sized, non-compliant left atrium during systole creates a giant, rapid v-wave on the PCWP tracing.
To identify the matching right item for acute severe mitral regurgitation.
5
Analyze the hemodynamic profile of massive pulmonary embolism.
Obstruction of the pulmonary vasculature leads to right heart strain (high right-sided pressures) and underfilling of the left heart (normal/low PCWP).
To identify the matching right item for massive pulmonary embolism.

Key Concept

Hemodynamic differentiation of structural, myocardial, and pericardial cardiac disease.
Estimated Time:2m 0s
Question 1722Question →

Match each classic cardiovascular physical examination finding with the most likely underlying structural or valvular pathology.

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Items

A mid-diastolic, low-pitched rumble with an opening snap; the time interval between aortic valve closure (A2A_2) and the opening snap (OSOS) inversely correlates with obstruction severity.
A harsh crescendo-decrescendo systolic murmur at the left lower sternal border that intensifies during the strain phase of the Valsalva maneuver and softens with passive leg raise.
A late-peaking systolic murmur at the right upper sternal border associated with a delayed, low-amplitude carotid upstroke; the murmur softens during sustained handgrip.
A high-pitched, blowing, early diastolic decrescendo murmur best heard along the left sternal border that increases in intensity with sudden squatting.

Matches

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Answer

Mitral stenosis matches with rheumatic tethering; HOCM matches with asymmetric septal hypertrophy and SAM; Aortic stenosis matches with calcific degeneration; Aortic regurgitation matches with incomplete semilunar coaptation.
Correct matching requires integrating physical examination findings (murmur timing, quality, and response to physiologic maneuvers) with their underlying anatomical pathology. Valsalva decreases preload, intensifying HOCM; handgrip increases afterload, softening AS; squatting increases afterload, intensifying AR; and a narrowed A2A_2-OSOS interval indicates severe MS.

Step-by-Step Solution

1
Analyze the first clinical finding: mid-diastolic rumble with an opening snap.
Identified as Mitral Stenosis.
The opening snap and diastolic rumble are hallmark signs of mitral stenosis, characterized pathophysiologically by rheumatic thickening of the mitral valve.
2
Analyze the second clinical finding: systolic murmur increasing with Valsalva and decreasing with leg raise.
Identified as Hypertrophic Obstructive Cardiomyopathy (HOCM).
Decreased preload (Valsalva) worsens the dynamic left ventricular outflow tract obstruction in HOCM, which is driven by asymmetric septal hypertrophy and systolic anterior motion of the mitral valve.
3
Analyze the third clinical finding: late-peaking systolic murmur with delayed carotid upstroke, softening with handgrip.
Identified as Aortic Stenosis.
Pulsus parvus et tardus and a late-peaking systolic murmur are classic for severe aortic stenosis, typically caused by age-related calcific degeneration.
4
Analyze the fourth clinical finding: early diastolic decrescendo murmur increasing with sudden squatting.
Identified as Aortic Regurgitation.
Squatting increases systemic vascular resistance (afterload), which worsens the backward flow of blood in aortic regurgitation, caused by incomplete coaptation of the aortic valve leaflets.

Key Concept

Dynamic auscultation and hemodynamic correlations of valvular and structural heart diseases.
Question 1723Question →

Match each patient's clinical presentation and laboratory coagulation profile with the most likely underlying bleeding disorder.

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Items

A 23-year-old man evaluated for acute right knee swelling after a minor trauma. Laboratory evaluation reveals a normal prothrombin time (PT), a prolonged activated partial thromboplastin time (aPTT), and a normal bleeding time.
A 25-year-old woman evaluated for heavy menstrual bleeding and frequent epistaxis. Laboratory evaluation reveals a normal PT, a prolonged aPTT, and a prolonged bleeding time.
A 65-year-old man in the intensive care unit with urosepsis who develops diffuse oozing from venipuncture sites. Laboratory evaluation reveals a prolonged PT, a prolonged aPTT, decreased fibrinogen, and significant thrombocytopenia.
A 60-year-old man who has been receiving prolonged enteral nutrition without supplementation and broad-spectrum antibiotics. Laboratory evaluation reveals a prolonged PT, a prolonged aPTT, and a normal platelet count.

Matches

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Answer

The correct pairings match the 23-year-old with hemarthroses to Hemophilia A, the 25-year-old with mucosal bleeding to Von Willebrand disease, the 65-year-old with sepsis to Disseminated intravascular coagulation, and the 60-year-old on antibiotics to Vitamin K deficiency.
Each diagnostic match correctly pairs a specific underlying pathophysiology with its characteristic clinical presentation and laboratory profile. Hemophilia A involves an isolated intrinsic pathway defect. Von Willebrand disease involves both an intrinsic pathway defect and a primary hemostasis defect. DIC is a consumptive coagulopathy affecting all pathways and platelets. Vitamin K deficiency affects multiple vitamin K-dependent factors across intrinsic and extrinsic pathways but spares platelets.

Step-by-Step Solution

1
Analyze the clinical bleeding pattern for each patient.
Identified whether the patient is experiencing deep tissue bleeding (suggesting secondary hemostasis defects) or mucosal/petechial bleeding (suggesting primary hemostasis defects).
Bleeding patterns provide the first clinical clue differentiating platelet disorders from coagulation factor deficiencies.
2
Evaluate the prothrombin time (PT) and activated partial thromboplastin time (aPTT).
Determined which coagulation pathways are affected: isolated aPTT points to intrinsic pathway, isolated PT to extrinsic, and both to common pathway or multiple factor deficiencies.
PT and aPTT isolate specific segments of the coagulation cascade to narrow down the diagnosis.
3
Correlate bleeding time and platelet counts with the coagulation times.
Differentiated between pure coagulation factor deficiencies (normal bleeding time/platelets) and mixed or consumptive disorders (abnormal bleeding time/platelets).
Bleeding time and platelet counts directly assess primary hemostatic function, which helps distinguish conditions like DIC or Von Willebrand disease from pure hemophilias.
4
Match the integrated clinical and laboratory findings to the specific pathophysiologic mechanism of each listed bleeding disorder.
Successfully paired each patient scenario with its definitive diagnosis.
Final confirmation requires synthesizing the physical presentation and full laboratory profile with known disease mechanisms.

Key Concept

Interpretation of laboratory coagulation profiles to diagnose specific bleeding disorders based on pathway defects.
Estimated Time:1m 30s
Question 1724Question →

Match the following classic liver biopsy histological findings to the most appropriate chronic hepatobiliary disorder.

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Items

Autoimmune hepatitis
Primary sclerosing cholangitis
Alpha-1 antitrypsin deficiency
Hereditary hemochromatosis
Primary biliary cholangitis

Matches

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Answer

Autoimmune hepatitis matches with a lymphoplasmacytic infiltrate and interface hepatitis. Primary sclerosing cholangitis matches with concentric periductal 'onion-skin' fibrosis. Alpha-1 antitrypsin deficiency matches with PAS-positive, diastase-resistant globules. Hereditary hemochromatosis matches with extensive hemosiderin deposition. Primary biliary cholangitis matches with granulomatous destruction of interlobular bile ducts.
Definitive diagnosis of chronic hepatobiliary diseases often requires liver biopsy when clinical and serological findings are indeterminate or overlapping. Each of these five conditions presents with highly specific, defining histological features that distinguish them from one another.

Step-by-Step Solution

1
Evaluate the histological hallmark for autoimmune hepatitis.
Matched to lymphoplasmacytic infiltrate with prominent interface hepatitis.
The pathogenesis is driven by cell-mediated autoimmunity, leading to plasma cell predominance and inflammation spreading from the portal tracts into the parenchyma (interface hepatitis).
2
Evaluate the histological hallmark for primary sclerosing cholangitis.
Matched to concentric periductal fibrosis with an 'onion-skin' appearance.
Chronic inflammation leads to stricturing and obliterative fibrosis of both intrahepatic and extrahepatic bile ducts, classically forming concentric rings of fibrous tissue.
3
Evaluate the histological hallmark for alpha-1 antitrypsin deficiency.
Matched to periportal hepatocytes containing PAS-positive, diastase-resistant globules.
Misfolded alpha-1 antitrypsin protein polymerizes and becomes trapped in the hepatocyte endoplasmic reticulum, resisting breakdown by diastase.
4
Evaluate the histological hallmark for hereditary hemochromatosis.
Matched to extensive hemosiderin deposition primarily within hepatocytes.
A defect in the HFE gene causes excessive intestinal iron absorption, resulting in hepatic iron storage that can be visualized using a Prussian blue stain.
5
Evaluate the histological hallmark for primary biliary cholangitis.
Matched to florid duct lesions with granulomatous destruction of interlobular bile ducts.
The condition involves T-cell-mediated autoimmune granulomatous destruction specifically targeting the small, interlobular intrahepatic bile ducts.

Key Concept

Histological hallmarks of chronic and autoimmune liver diseases
Question 1725Question →

Match each clinical presentation of dysphagia and chest pain to its most characteristic high-resolution esophageal manometry finding.

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Items

A 41-year-old woman with a history of recurrent digital vasospasm in cold weather presents with worsening heartburn and difficulty swallowing solid foods. Physical examination reveals taut, thickened skin over her fingers.
A 29-year-old man reports a 6-month history of difficulty swallowing both solids and liquids. He frequently regurgitates undigested food, especially at night, and has experienced a 4-kg (8.8-lb) weight loss.
A 52-year-old woman presents with episodes of squeezing central chest pain that often radiate to her back, accompanied by intermittent dysphagia. A cardiac stress test is entirely normal.
A 64-year-old man undergoes evaluation for severe, episodic dysphagia and retrosternal pain. Upper endoscopy shows no structural abnormalities, and a barium swallow demonstrates normally coordinated but exceptionally forceful contractions.

Matches

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Answer

Systemic sclerosis pairs with absent peristalsis and diminished LES pressure; Achalasia pairs with absent peristalsis and incomplete LES relaxation; Diffuse esophageal spasm pairs with premature simultaneous contractions; Hypercontractile esophagus pairs with high-amplitude coordinated contractions.
Esophageal motility disorders frequently present with overlapping symptoms of dysphagia, regurgitation, and non-cardiac chest pain. High-resolution manometry is the gold standard for differentiating these conditions based on two primary metrics: peristaltic integrity (coordination and amplitude) and lower esophageal sphincter (LES) dynamics (resting pressure and relaxation). Systemic sclerosis causes smooth muscle fibrosis leading to a weak LES; achalasia is caused by neuronal degeneration leading to a non-relaxing LES; diffuse esophageal spasm causes uncoordinated contractions; and hypercontractile esophagus causes excessively strong but coordinated contractions.

Step-by-Step Solution

1
Diagnose the underlying condition for each clinical vignette based on the provided symptoms and physical findings.
The vignettes represent systemic sclerosis (CREST syndrome features), achalasia, diffuse esophageal spasm (DES), and hypercontractile esophagus, respectively.
Accurate clinical diagnosis is a prerequisite for anticipating the expected diagnostic test findings on high-resolution manometry.
2
Correlate each diagnosed motility disorder with its specific pathophysiologic mechanism and manometric pattern.
Systemic sclerosis = hypotensive LES + aperistalsis. Achalasia = failure of LES relaxation + aperistalsis. DES = premature simultaneous contractions. Hypercontractile esophagus = high-amplitude peristaltic contractions.
High-resolution manometry directly measures the specific neuromuscular deficits responsible for each condition's symptoms.

Key Concept

Pathophysiology and manometric findings of esophageal motility disorders
Question 1726Question →

Match each etiology of thyrotoxicosis to its characteristic laboratory and radioactive iodine uptake (RAIU) diagnostic profile.

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Items

Graves disease
Exogenous thyroid hormone intake
Subacute (granulomatous) thyroiditis
Toxic multinodular goiter

Matches

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Answer

Graves disease matches with diffusely increased RAIU; Exogenous thyroid hormone matches with decreased RAIU and decreased thyroglobulin; Subacute thyroiditis matches with decreased RAIU and increased thyroglobulin; Toxic multinodular goiter matches with heterogeneous (patchy) increased RAIU.
The matching correctly pairs each underlying pathophysiology with its diagnostic hallmark. RAIU maps the gland's synthetic activity, separating hyper-synthesizing disorders from destructive/exogenous ones. Thyroglobulin further differentiates endogenous destructive processes (high) from exogenous hormone suppression (low).

Step-by-Step Solution

1
Confirm the presence of thyrotoxicosis.
All profiles demonstrate decreased TSH and increased Free T4.
This establishes the primary biochemical state before differentiating the underlying cause.
2
Evaluate the radioactive iodine uptake (RAIU) pattern.
RAIU distinguishes conditions with increased hormone synthesis (high uptake) from those with hormone release/exogenous sources (low uptake).
High/normal uptake points to Graves or toxic nodular disease. Low uptake points to thyroiditis, iodine load, or exogenous sources.
3
Differentiate high RAIU conditions by uptake distribution.
Diffuse uptake indicates Graves disease, whereas patchy/heterogeneous uptake indicates toxic multinodular goiter.
Graves involves global gland stimulation by antibodies, whereas TMNG involves localized autonomous nodules.
4
Differentiate low RAIU conditions using serum thyroglobulin.
High thyroglobulin indicates thyroiditis (follicular destruction), whereas low thyroglobulin indicates exogenous intake.
Thyroglobulin is co-secreted with endogenous thyroid hormone. Its absence confirms the thyrotoxicosis is from an external source.

Key Concept

Differentiation of thyrotoxicosis etiologies using radioactive iodine uptake (RAIU) and serum thyroglobulin levels.
Estimated Time:1m 30s
Question 1727Question →

Match each infectious disease clinical scenario with the most appropriate targeted antimicrobial therapy or post-exposure prophylaxis regimen.

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Items

A 21-year-old college student who shared a drink with a roommate 2 days prior to the roommate's admission for Neisseria meningitidis meningitis.
A 30-year-old pregnant woman at 10 weeks gestation presenting with a targetoid rash on her thigh after a camping trip in a Lyme-endemic area.
A 45-year-old male presenting with a painless, 1-cm ulcer with raised, indurated borders on his glans penis and bilateral non-tender inguinal lymphadenopathy.
A 28-year-old medical resident who sustained a deep percutaneous injury with a hollow-bore needle recently used on a patient with uncontrolled HIV.

Matches

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Answer

Meningitis contact matches with single-dose ciprofloxacin; Pregnant patient with Lyme disease matches with amoxicillin; Primary syphilis matches with intramuscular penicillin G benzathine; HIV needle stick exposure matches with 28-day course of tenofovir-emtricitabine plus dolutegravir.
Each clinical scenario requires a specific, guideline-directed antimicrobial approach. Meningococcal close contacts need ciprofloxacin, rifampin, or ceftriaxone. Pregnant patients with Lyme disease should receive amoxicillin to avoid teratogenic effects. Primary syphilis is definitively treated with intramuscular penicillin G benzathine. High-risk occupational HIV exposures require a 28-day course of a 3-drug antiretroviral regimen.

Step-by-Step Solution

1
Evaluate the first scenario for meningococcal exposure prophylaxis.
Identify that sharing oral secretions with a meningococcal meningitis patient is a high-risk exposure requiring prophylaxis with ciprofloxacin, rifampin, or ceftriaxone.
Chemoprophylaxis prevents secondary cases among close contacts by rapidly eradicating nasopharyngeal carriage.
2
Assess the pregnant patient presenting with a targetoid rash.
Diagnose early localized Lyme disease (erythema migrans) and select amoxicillin.
Doxycycline is typically contraindicated in pregnancy due to fetal risks, making amoxicillin the first-line safe alternative.
3
Analyze the presentation of a painless penile ulcer.
Diagnose primary syphilis and select intramuscular penicillin G benzathine.
Penicillin remains the curative and definitive first-line treatment for early syphilis.
4
Evaluate the occupational HIV exposure risk.
Classify the hollow-bore needle stick from an uncontrolled HIV patient as high-risk, warranting full 3-drug post-exposure prophylaxis for 28 days.
A 3-drug regimen maximizes the prevention of viral integration and establishment of systemic infection after a significant exposure.

Key Concept

Appropriate selection of targeted antimicrobial therapy and prophylaxis depends on the specific pathogen, patient characteristics (e.g., pregnancy status), and the specific nature of the exposure.
Question 1728Question →

Correlate the following clinical conditions with their most characteristic acid-base and electrolyte laboratory profile.

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Items

Surreptitious vomiting
Primary hyperaldosteronism
Thiazide diuretic abuse
Severe acute diarrhea

Matches

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Answer

Surreptitious vomiting is matched with low urine chloride metabolic alkalosis; Primary hyperaldosteronism with high urine chloride metabolic alkalosis and hypertension; Thiazide abuse with high urine chloride metabolic alkalosis and normotension; Severe acute diarrhea with normal anion gap metabolic acidosis.
Surreptitious vomiting causes saline-responsive alkalosis (low urine chloride). Thiazide abuse causes saline-resistant alkalosis (high urine chloride) with volume depletion. Primary hyperaldosteronism causes saline-resistant alkalosis (high urine chloride) with volume expansion (hypertension). Diarrhea causes a non-anion gap metabolic acidosis due to direct gastrointestinal base loss.

Step-by-Step Solution

1
Differentiate the causes of hypokalemic metabolic alkalosis based on blood pressure.
Hypertension points to mineralocorticoid excess (Primary hyperaldosteronism). Normotension or hypotension points to volume contraction (vomiting or diuretic use).
Volume status helps narrow down the etiology of metabolic alkalosis.
2
Differentiate the volume-contracted causes of metabolic alkalosis using urine chloride.
Urine chloride <20< 20 mEq/L indicates an extrarenal cause of chloride loss where the kidneys are functioning properly to retain chloride (surreptitious vomiting). Urine chloride >20> 20 mEq/L indicates renal chloride wasting (thiazide diuretic abuse).
Urine chloride distinguishes saline-responsive (extrarenal) from saline-resistant (renal) chloride losses.
3
Identify the primary acid-base disorder caused by severe lower gastrointestinal fluid loss.
Loss of bicarbonate-rich fluid results in a normal anion gap metabolic acidosis.
Unlike gastric fluid which is acidic, lower gastrointestinal fluid is rich in bicarbonate and potassium.

Key Concept

Differentiation of acid-base disorders using volume status, blood pressure, and urine chloride.
Estimated Time:1m 30s
Question 1729Question →

Evaluate the following clinical presentations and pair each patient with the most likely predominant morphologic abnormality expected on their peripheral blood smear.

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Items

A 28-year-old man with a history of recurrent childhood dactylitis who now presents with acute chest pain, hypoxia, and new pulmonary infiltrates.
A 22-year-old man who develops dark urine, fatigue, and scleral icterus three days after initiating oral trimethoprim-sulfamethoxazole for cellulitis.
A 41-year-old woman admitted with fever, acute confusion, a platelet count of 22,000/mm³, and an elevated serum creatinine level.
A 33-year-old woman with systemic lupus erythematosus exhibiting new-onset fatigue, elevated indirect bilirubin, and a strongly positive direct Coombs test.

Matches

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Answer

The pairings are: the sickle cell disease patient with Howell-Jolly bodies, the G6PD deficiency patient with bite cells, the TTP patient with schistocytes, and the AIHA patient with spherocytes.
Each peripheral smear finding is directly tied to the mechanism of red blood cell injury or clearance. Howell-Jolly bodies reflect loss of splenic macrophage clearance functions (autosplenectomy). Bite cells reflect active splenic macrophage removal of precipitated hemoglobin (Heinz bodies) due to oxidative stress. Schistocytes indicate intravascular mechanical trauma. Spherocytes indicate extravascular partial membrane removal by splenic macrophages responding to bound IgG.

Step-by-Step Solution

1
Analyze each clinical vignette to determine the underlying hematologic diagnosis.
Identified diagnoses: Sickle cell disease (Left 1), G6PD deficiency (Left 2), Thrombotic thrombocytopenic purpura (Left 3), and Autoimmune hemolytic anemia (Left 4).
Establishing the correct diagnosis is requisite for predicting the hematologic lab findings.
2
Identify the pathophysiologic mechanism of red blood cell destruction or alteration for each diagnosis.
Mechanisms: Autosplenectomy (Sickle cell), oxidative damage and macrophage pitting (G6PD), mechanical shearing across microthrombi (TTP), and partial membrane phagocytosis of IgG-coated cells (AIHA).
Understanding the mechanism allows for logical deduction of the red blood cell morphology rather than pure memorization.
3
Match the mechanism to the pathognomonic peripheral blood smear finding.
Autosplenectomy leaves Howell-Jolly bodies; oxidative pitting leaves bite cells; mechanical shearing creates schistocytes; partial membrane loss creates spherocytes.
This completes the diagnostic correlation required by the question.

Key Concept

Distinct pathophysiologic mechanisms of red blood cell disorders directly correlate with pathognomonic morphological abnormalities on a peripheral blood smear.
Question 1730Question →

Match each dynamic auscultation or hemodynamic finding to the most likely underlying cardiovascular pathology.

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Items

A harsh systolic murmur that decreases in intensity during a sustained handgrip maneuver
A systolic murmur that becomes prolonged and moves closer to S1 during the strain phase of the Valsalva maneuver
An early diastolic decrescendo murmur that decreases in intensity following administration of amyl nitrite
A low-pitched diastolic rumble with a shorter A2-to-extra sound interval as disease severity worsens

Matches

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Answer

The correct matches align specific hemodynamic responses and dynamic auscultation findings to their respective valvular and structural pathologies based on changes in preload and afterload.
Each cardiovascular pathology is correctly matched based on standard physiological principles governing how maneuvers that alter preload and afterload affect murmur intensity, duration, and timing.

Step-by-Step Solution

1
Analyze the effect of sustained handgrip on the harsh systolic murmur.
The murmur intensity decreases.
Handgrip increases afterload, which increases left ventricular volume and physically opens the narrowed left ventricular outflow tract, characteristic of Hypertrophic Obstructive Cardiomyopathy.
2
Analyze the effect of the Valsalva strain phase on the systolic murmur.
The murmur moves closer to S1 and prolongs.
Valsalva decreases preload and reduces left ventricular volume, causing earlier prolapse of the redundant leaflets seen in Mitral Valve Prolapse.
3
Analyze the effect of amyl nitrite on the early diastolic murmur.
The murmur intensity decreases.
Amyl nitrite decreases afterload, which reduces the backward pressure gradient pushing blood retrogradely across an incompetent valve in Aortic Regurgitation.
4
Analyze the A2-to-extra sound interval in the low-pitched diastolic rumble.
A shorter interval indicates greater disease severity.
Higher left atrial pressure in severe Mitral Stenosis forces the valve open earlier in diastole, shortening the A2-Opening Snap interval.

Key Concept

Dynamic auscultation and hemodynamic responses of cardiac murmurs
Estimated Time:1m 30s
Question 1731Question →

A 55-year-old standardized patient is being utilized for a bedside physical examination OSCE. Examinees are required to evaluate jugular venous pulse (JVP) waveforms. Match each detailed description of a JVP waveform abnormality with the cardiovascular pathology that best explains its pathogenesis.

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Items

Intermittent, exaggerated 'a' waves occurring irregularly and independently of the respiratory cycle
Obliteration of the 'x' descent with a prominent systolic 'v' wave and a rapid 'y' descent
Steep 'x' and 'y' descents yielding a characteristic 'W' or 'M' contour
Prominent 'x' descent with an attenuated or completely absent 'y' descent
Consistently prominent 'a' wave occurring with every cardiac cycle, accompanied by a slow 'y' descent

Matches

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Answer

The correct pairings rely on applying normal right atrial pressure principles ('a' wave = atrial contraction; 'x' descent = atrial relaxation; 'v' wave = venous filling; 'y' descent = atrial emptying) to specific structural and electrical derangements.
Each specific JVP waveform directly reflects the underlying hemodynamics of the right atrium. Abnormalities in relaxation (x descent), emptying (y descent), contraction (a wave), and venous return/regurgitation (v wave) isolate specific structural or electrical defects.

Step-by-Step Solution

1
Analyze the intermittent, exaggerated 'a' waves.
Matches with Complete atrioventricular block.
Intermittency implies a dissociation between the atria and ventricles, where occasionally the atrium contracts against a closed tricuspid valve, typical of complete heart block (Cannon 'a' waves).
2
Analyze the obliteration of the 'x' descent with a prominent 'v' wave.
Matches with Severe tricuspid regurgitation.
Systolic backflow from the right ventricle into the right atrium increases atrial pressure during systole, replacing the normal 'x' descent (relaxation) with a large 'v' wave.
3
Analyze the steep 'x' and 'y' descents ('W' contour).
Matches with Constrictive pericarditis.
A rigid pericardium allows rapid early ventricular filling before abrupt restriction, producing prominent 'x' and 'y' descents.
4
Analyze the absent 'y' descent.
Matches with Cardiac tamponade.
External compression prevents early right ventricular filling, thus eliminating the 'y' descent (atrial emptying phase).
5
Analyze the consistently prominent 'a' wave with a slow 'y' descent.
Matches with Tricuspid stenosis.
Fixed inflow obstruction causes the atrium to contract forcefully every cycle (giant 'a' wave) and slows the emptying process into the ventricle (slow 'y' descent).

Key Concept

Pathophysiologic interpretation of jugular venous pulse (JVP) waveforms in structural and arrhythmogenic cardiac disease.
Question 1732Question →

Match each structural heart pathology with its most characteristic physical examination findings.

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Items

Severe aortic stenosis
Rheumatic mitral stenosis
Hypertrophic obstructive cardiomyopathy
Chronic aortic regurgitation

Matches

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Answer

Severe aortic stenosis matches with the late-peaking systolic murmur and delayed carotids; Rheumatic mitral stenosis matches with the loud S1, opening snap, and diastolic rumble; Hypertrophic obstructive cardiomyopathy matches with the murmur that decreases with squatting; and Chronic aortic regurgitation matches with the early diastolic murmur and widened pulse pressure.
Each structural pathology induces distinct hemodynamic changes that manifest as specific physical exam findings. Aortic stenosis causes fixed outflow obstruction leading to delayed ventricular emptying (delayed carotids). Mitral stenosis causes a prominent opening snap due to tensing of thickened leaflets. Hypertrophic obstructive cardiomyopathy has dynamic left ventricular outflow tract obstruction that is relieved by increased left ventricular volume (squatting). Aortic regurgitation features backflow during diastole, causing a widened pulse pressure due to high stroke volume and rapid runoff.

Step-by-Step Solution

1
Differentiate the structural pathologies based on whether they produce primarily systolic or diastolic murmurs.
Aortic stenosis and hypertrophic obstructive cardiomyopathy cause systolic murmurs. Mitral stenosis and aortic regurgitation cause diastolic murmurs.
Categorizing murmurs by their timing in the cardiac cycle narrows down the matching choices.
2
Analyze the systolic murmurs based on dynamic maneuvers and pulse characteristics.
The murmur that decreases with squatting points to hypertrophic obstructive cardiomyopathy, while delayed carotid upstrokes point to severe aortic stenosis.
Hemodynamic responses to physical maneuvers and pulse palpation reliably distinguish mechanisms of left ventricular outflow tract obstruction.
3
Analyze the diastolic murmurs based on specific auscultatory features.
An opening snap followed by a rumble points to mitral stenosis, whereas a decrescendo murmur with a widened pulse pressure points to aortic regurgitation.
The precise timing of the murmur and associated peripheral vascular signs confirm the affected valve.

Key Concept

Correlation of valvular and structural heart diseases with classical auscultatory findings and hemodynamic responses to physical maneuvers.
Question 1733Question →

Match each acute abdominal clinical presentation with its most appropriate initial definitive management strategy.

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Items

A 41-year-old man presents with sudden, agonizing epigastric pain; upright chest radiograph demonstrates a radiolucent crescent beneath the right hemidiaphragm.
A 67-year-old woman with irregular heart rhythms off anticoagulation develops severe periumbilical pain that lacks peritoneal signs; laboratory studies show a pH of 7.28.
A 59-year-old man with a prior midline incision reports worsening colicky pain and obstipation; imaging confirms dilated enteron loops without transition zone compromise.
A 29-year-old woman exhibits migrating periumbilical pain that settles in the right iliac fossa, accompanied by localized rigidity and leukocytosis.

Matches

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Answer

The scenarios match their respective surgical or nonoperative interventions: perforated viscus to omental patch repair, acute mesenteric ischemia to revascularization, uncomplicated small bowel obstruction to conservative fluid and tube management, and acute appendicitis to laparoscopic appendectomy.
Each specific gastrointestinal emergency dictates a unique management pathway. Perforated viscus requires closure of the defect, ischemic bowel requires restored blood flow, uncomplicated obstruction requires bowel rest and decompression, and acute appendicitis requires surgical removal of the appendix.

Step-by-Step Solution

1
Evaluate each clinical vignette for classic diagnostic hallmarks.
Identified pneumoperitoneum (perforated ulcer), pain out of proportion with acidosis (mesenteric ischemia), uncomplicated adhesive obstruction, and focal right lower quadrant peritonitis (appendicitis).
Accurate recognition of the underlying pathology is necessary to triage the patient to the correct treatment pathway.
2
Assign the gold-standard initial definitive therapy for each identified condition.
Matched each diagnosis to its distinct procedural or medical intervention.
Standard surgical guidelines dictate specific, uniquely tailored operative and nonoperative strategies for these acute abdominal emergencies.

Key Concept

Surgical triage and definitive management of acute abdominal emergencies
Question 1734Question →

Match each of the following Hepatitis B serologic profiles with the most accurate clinical interpretation. Assume all patients have normal liver enzymes and no clinical signs of acute liver failure.

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Items

HBsAg(+), Anti-HBc IgM(+), Anti-HBs(-), HBeAg(+)
HBsAg(-), Anti-HBc IgG(+), Anti-HBs(+), HBeAg(-)
HBsAg(-), Anti-HBc(-), Anti-HBs(+), HBeAg(-)
HBsAg(+), Anti-HBc IgG(+), Anti-HBs(-), HBeAg(-), Anti-HBe(+)

Matches

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Answer

Serology 1 matches Acute Hepatitis B; Serology 2 matches Immunity from natural infection; Serology 3 matches Immunity from vaccination; Serology 4 matches Chronic Hepatitis B (low replication).
Each serologic panel corresponds precisely to a specific pathophysiologic stage of Hepatitis B exposure. HBsAg defines active virus. Anti-HBc defines natural exposure, differentiating acute (IgM) from chronic/resolved (IgG). Anti-HBs defines immunity.

Step-by-Step Solution

1
Evaluate the Hepatitis B surface antigen (HBsAg) status.
Positive HBsAg indicates active infection (acute or chronic); negative HBsAg indicates no current active infection.
HBsAg is the hallmark of active viral presence in the host.
2
Examine the Hepatitis B core antibody (Anti-HBc) profile.
IgM implies an early, acute phase. IgG implies a prolonged exposure (chronic) or a fully resolved past infection.
Core antibodies develop against the viral nucleocapsid only during natural infection, never from vaccination.
3
Determine the Hepatitis B surface antibody (Anti-HBs) status.
A positive Anti-HBs provides neutralizing immunity. If alone, it is from a vaccine. If paired with Anti-HBc IgG, it is from a cleared natural infection.
Vaccines only contain the surface antigen, whereas natural infections expose the host to the entire virus.
4
Assess the HBeAg and Anti-HBe status in HBsAg-positive profiles.
HBeAg marks high viral replication, whereas Anti-HBe marks low replication and an inactive carrier state.
HBeAg is a surrogate marker for viral load and infectivity.

Key Concept

Interpretation of Hepatitis B viral serology to determine acute infection, chronic infection, resolution, and vaccination status.
Question 1735Question →

Match each brief clinical presentation of chronic diarrhea to its most likely underlying etiology or pathogenesis.

Click a left item, then click its matching right item

Items

A 45-year-old man with voluminous, watery diarrhea, profound hypokalemia (2.2 mEq/L), and absent gastric acid secretion on testing
A 32-year-old woman with chronic diarrhea, iron deficiency anemia, and an intensely pruritic, papulovesicular rash on her elbows and knees
A 24-year-old man with intermittent bloating and watery diarrhea characterized by a high stool osmotic gap (>125 mOsm/kg) and an acidic stool pH
A 55-year-old woman with episodic facial flushing, chronic watery diarrhea, and a right-sided systolic heart murmur that increases with inspiration
A 28-year-old healthcare worker with recurrent watery diarrhea whose colonoscopy reveals dark brown discoloration of the colonic mucosa with pale patches

Matches

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Answer

The correct matches pair each specific clinical presentation of diarrhea with its exact pathophysiological mechanism: WDHA syndrome to VIPoma, dermatitis herpetiformis to celiac disease, high stool osmotic gap with acidic pH to lactase deficiency, flushing with right-sided heart murmur to carcinoid syndrome, and melanosis coli to laxative abuse.
Each clinical vignette provides pathognomonic features for a specific etiology of chronic diarrhea. VIPomas present with Watery Diarrhea, Hypokalemia, and Achlorhydria (WDHA syndrome). Celiac disease classically presents with malabsorption and dermatitis herpetiformis. Lactase deficiency causes an osmotic diarrhea characterized by a high stool osmotic gap and acidic stool pH due to bacterial fermentation of unabsorbed carbohydrates. Carcinoid syndrome typically involves episodic flushing, secretory diarrhea, and right-sided valvular lesions (like tricuspid regurgitation). Factitious diarrhea due to anthraquinone laxative abuse is classically identified by melanosis coli, a dark brown pigmentation of the colon.

Step-by-Step Solution

1
Analyze the first vignette focusing on diarrhea, profound hypokalemia, and achlorhydria.
Identified as WDHA syndrome.
These findings are the classic diagnostic triad for a VIPoma.
2
Examine the second vignette noting diarrhea, iron deficiency anemia, and a pruritic vesicular rash on extensor surfaces.
Identified as celiac disease presenting with dermatitis herpetiformis.
This rash is pathognomonic for gluten-sensitive enteropathy (autoimmune villous destruction).
3
Evaluate the third vignette noting a high stool osmotic gap and acidic stool pH.
Identified as an osmotic diarrhea due to carbohydrate malabsorption, such as lactase deficiency.
Unabsorbed lactose is fermented by gut flora into short-chain fatty acids, lowering the stool pH and increasing the osmotic gap.
4
Analyze the fourth vignette highlighting flushing, diarrhea, and a right-sided heart murmur.
Identified as carcinoid syndrome.
Excess serotonin causes right-sided valvular fibrosis (tricuspid regurgitation) and secretory diarrhea.
5
Review the fifth vignette describing a healthcare worker with dark brown colonic mucosa.
Identified as factitious diarrhea from laxative abuse.
Melanosis coli is a classic endoscopic finding of chronic anthraquinone laxative use.

Key Concept

Differential diagnosis of chronic diarrhea based on specific clinical and laboratory findings
Question 1736Question →

Select the most appropriate first-line antimicrobial therapy for each of the following patient presentations.

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Items

During a routine obstetric visit, a woman at 10 weeks gestation is evaluated for an 8-cm expanding annular erythematous rash with central clearing. She recently returned from a camping trip in New York.
An adult male seeks evaluation at a sexual health clinic for a single, painless, indurated penile ulcer with a clean base. His rapid plasma reagin testing returns reactive.
While undergoing induction chemotherapy for acute myeloid leukemia, a hospitalized patient develops a fever of 38.9°C (102.0°F). Laboratory testing shows an absolute neutrophil count of 200/mm³.
An untreated patient with advanced HIV (CD4 count 35/mm³) reports progressive blurring of vision and floaters. Ophthalmic examination reveals perivascular yellow-white retinal exudates with associated hemorrhages.
A patient with HIV (CD4 count 80/mm³) complains of worsening retrosternal pain upon swallowing. Physical examination reveals removable white plaques on the buccal mucosa.

Matches

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Answer

The clinical scenarios correctly match with their targeted antimicrobial therapies: early Lyme disease in pregnancy with oral amoxicillin, primary syphilis with intramuscular penicillin G benzathine, febrile neutropenia with intravenous cefepime, CMV retinitis with oral valganciclovir, and esophageal candidiasis with oral fluconazole.
Each specific clinical syndrome corresponds to a singular first-line, evidence-based antimicrobial therapy. Amoxicillin prevents teratogenic complications in pregnant patients with Lyme disease. Intramuscular penicillin G benzathine is the only proven reliable curative agent for primary syphilis. Intravenous cefepime provides the necessary empiric antipseudomonal coverage for febrile neutropenia. Oral valganciclovir offers targeted cytomegalovirus inhibition for CMV retinitis. Oral fluconazole provides systemic coverage necessary for esophageal candidiasis.

Step-by-Step Solution

1
Analyze the pregnant patient with an annular rash following a camping trip in an endemic region.
Diagnosis is early localized Lyme disease. The preferred treatment in pregnancy is oral amoxicillin.
Standard doxycycline therapy is contraindicated in pregnancy due to risks to fetal bone and teeth development.
2
Evaluate the patient with a painless penile ulcer and reactive RPR.
Diagnosis is primary syphilis, which is definitively treated with intramuscular penicillin G benzathine.
This depot formulation provides the sustained treponemicidal levels necessary for cure.
3
Assess the chemotherapy patient presenting with fever and an absolute neutrophil count < 500/mm³.
Diagnosis is high-risk febrile neutropenia, necessitating intravenous cefepime.
Immediate empiric broad-spectrum coverage with antipseudomonal activity is required to prevent rapid clinical deterioration.
4
Examine the advanced HIV patient with floaters, retinal hemorrhages, and exudates.
Diagnosis is CMV retinitis, treated specifically with oral valganciclovir.
Targeted anti-CMV therapy is required to prevent blindness.
5
Identify the cause of odynophagia in the HIV patient with concurrent oral thrush.
Diagnosis is esophageal candidiasis, which responds effectively to oral fluconazole.
Topical antifungals are insufficient for esophageal involvement; systemic therapy is required.

Key Concept

Targeted Antimicrobial Selection for Common Infectious Syndromes
Question 1737Question →

A 2nd-year internal medicine resident is preparing a presentation on inherited and acquired renal tubular disorders. Match each of the following tubulopathies with its primary pathophysiological defect or defining molecular characteristic.

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Items

Fanconi syndrome
Bartter syndrome
Gitelman syndrome
Liddle syndrome
Syndrome of apparent mineralocorticoid excess

Matches

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Answer

Fanconi syndrome matches with the generalized proximal tubule defect; Bartter syndrome matches with the Na+-K+-2Cl- cotransporter defect; Gitelman syndrome matches with the Na+-Cl- cotransporter defect; Liddle syndrome matches with the ENaC gain-of-function mutation; Syndrome of apparent mineralocorticoid excess matches with the 11-beta-hydroxysteroid dehydrogenase type 2 enzyme deficiency.
Renal tubulopathies are characterized by specific transporter or enzymatic defects along the nephron. Fanconi syndrome causes global proximal tubular dysfunction. Bartter syndrome affects the NKCC2 transporter in the thick ascending limb. Gitelman syndrome involves the NCC transporter in the distal convoluted tubule. Liddle syndrome is driven by an overactive ENaC in the collecting duct. Finally, the syndrome of apparent mineralocorticoid excess results from a deficiency in 11-beta-hydroxysteroid dehydrogenase type 2, which normally prevents circulating cortisol from acting on mineralocorticoid receptors in the kidney.

Step-by-Step Solution

1
Identify the primary defect location for Fanconi syndrome.
It involves the proximal tubule.
This leads to a failure in reabsorbing essential filtered solutes, resulting in glycosuria, phosphaturia, and aminoaciduria.
2
Differentiate Bartter and Gitelman syndromes based on their respective transporters.
Bartter syndrome affects the thick ascending limb (NKCC2), while Gitelman syndrome affects the distal convoluted tubule (NCC).
Bartter mimics the effects of loop diuretics; Gitelman mimics the effects of thiazide diuretics.
3
Determine the mechanism behind Liddle syndrome.
Constitutive activation of ENaC in the collecting duct.
This causes unregulated sodium retention, severe hypertension, and hypokalemia, while suppressing endogenous aldosterone.
4
Identify the pathophysiology of the Syndrome of apparent mineralocorticoid excess (SAME).
Deficiency in the 11-beta-HSD2 enzyme.
Cortisol is not converted to inactive cortisone and instead binds to and over-activates the mineralocorticoid receptor.

Key Concept

Understanding the specific anatomical and molecular defects of renal tubulopathies is essential for predicting their clinical and laboratory manifestations.
Question 1738Question →

Match each clinical presentation of a patient with a suspected hereditary gastrointestinal syndrome to the most accurate diagnosis.

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Items

A 22-year-old patient presents with multiple hamartomatous polyps in the jejunum, dark macules on the buccal mucosa, and a family history of pancreatic cancer.
A 34-year-old patient undergoes colonoscopy revealing over 100 adenomatous polyps. Physical examination is notable for an osteoma of the mandible and epidermoid cysts.
A 45-year-old patient is diagnosed with proximal colon cancer. Tumor analysis shows high microsatellite instability and loss of MSH2 protein expression.
A 19-year-old patient is found to have dozens of colonic adenomas shortly after undergoing surgical resection for a primary medulloblastoma.
A 40-year-old patient presents with 30-40 colonic adenomas. Genetic testing reveals a biallelic autosomal recessive mutation affecting DNA base excision repair, with a normal APC gene.

Matches

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Answer

The presentations map respectively to Peutz-Jeghers syndrome (hamartomas and pigmentation), Gardner syndrome (adenomas and osteoma), Lynch syndrome (mismatch repair defect and proximal cancer), Turcot syndrome (adenomas and medulloblastoma), and MUTYH-associated polyposis (base excision repair defect).
Each genetic syndrome possesses highly specific phenotypic and genotypic markers required for accurate diagnosis: Peutz-Jeghers features hamartomas and pigmentation; Gardner features osteomas; Lynch features mismatch repair defects without extensive polyposis; Turcot features CNS tumors; and MAP features base excision repair defects with an attenuated polyposis phenotype.

Step-by-Step Solution

1
Analyze the presentation with hamartomatous polyps and mucocutaneous lesions.
Identifies Peutz-Jeghers syndrome.
STK11 mutations cause characteristic perioral hyperpigmentation and hamartomas.
2
Identify the syndrome featuring classic adenomatous polyposis plus bone/soft tissue tumors.
Identifies Gardner syndrome.
Gardner is an FAP variant with prominent extracolonic manifestations like osteomas and epidermoid cysts.
3
Evaluate the patient with mismatch repair deficiency and right-sided colon cancer.
Identifies Lynch syndrome.
Loss of MSH2 is a classic DNA mismatch repair defect causing Lynch syndrome.
4
Identify the correlation between colonic polyposis and a central nervous system tumor.
Identifies Turcot syndrome.
Turcot syndrome is specifically defined by the concurrence of CNS tumors and colonic polyposis.
5
Assess the case with autosomal recessive inheritance and defective base excision repair.
Identifies MUTYH-associated polyposis.
MAP is recessively inherited and caused by failures in base excision repair, distinguishing it from FAP which is an autosomal dominant APC mutation.

Key Concept

Hereditary gastrointestinal polyposis and neoplastic syndromes are differentiated by their distinct polyp histology, specific extracolonic manifestations, and underlying genetic mechanisms.
Question 1739Question →

A 6565-year-old male is evaluated in the cardiac intensive care unit for undifferentiated shock. A pulmonary artery catheter is placed to obtain precise hemodynamic measurements. Match the following cardiac conditions with their most characteristic right heart catheterization hemodynamic profile.

Click a left item, then click its matching right item

Items

Constrictive pericarditis
Cardiac tamponade
Acute severe mitral regurgitation
Acute ventricular septal defect
Restrictive cardiomyopathy

Matches

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Answer

Constrictive pericarditis matches with discordant pressure changes and prominent x/yx/y descents; Cardiac tamponade matches with a blunted yy descent; Acute mitral regurgitation matches with giant vv waves; Acute ventricular septal defect matches with an oxygen step-up; Restrictive cardiomyopathy matches with concordant pressure changes and left ventricular end-diastolic pressure > right ventricular end-diastolic pressure.
Each condition produces a distinct and pathognomonic right heart catheterization profile based on its underlying pathophysiology, ranging from external cardiac compression to intracardiac shunting or valvular incompetence.

Step-by-Step Solution

1
Analyze the hemodynamic profiles of pericardial diseases.
Both tamponade and constriction cause equalization of diastolic pressures, but tamponade lacks a yy descent while constriction has prominent xx and yy descents with discordant respiratory variation.
Differentiates cardiac tamponade from constrictive pericarditis.
2
Differentiate constrictive pericarditis from restrictive cardiomyopathy.
Restrictive cardiomyopathy has concordant respiratory changes and left ventricular end-diastolic pressure significantly greater than right ventricular end-diastolic pressure.
Both present with prominent xx and yy descents and right heart failure, requiring differentiation by respiratory variation and pressure differences.
3
Analyze the hemodynamic profiles of mechanical complications of myocardial infarction.
Acute mitral regurgitation produces giant vv waves on the pulmonary capillary wedge pressure tracing, while an acute ventricular septal defect causes an oxygen step-up from the right atrium to the right ventricle.
Distinguishes between two common causes of cardiogenic shock presenting with a new holosystolic murmur.

Key Concept

Hemodynamic profiling via right heart catheterization is essential for differentiating shock states and complex cardiac pathologies, such as pericardial versus restrictive diseases and mechanical complications of myocardial infarction.
Question 1740Question →

Match the following clinical and laboratory descriptions with the most likely underlying hematologic disorder.

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Items

Massive splenomegaly, 'dry tap' on bone marrow aspiration, and teardrop cells on peripheral smear
Episodic epistaxis, heavy menses, normal PT and aPTT, but prolonged bleeding time
Recurrent deep vein thromboses, normal PT and aPTT, and lack of aPTT prolongation upon addition of activated protein C
Bone pain, renal insufficiency, hypercalcemia, and peripheral smear demonstrating erythrocytes stacked like coins
Petechiae, mucosal bleeding, isolated severe thrombocytopenia, and normal PT and aPTT

Matches

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Answer

1 matches Primary Myelofibrosis, 2 matches von Willebrand Disease, 3 matches Factor V Leiden, 4 matches Multiple Myeloma, 5 matches Immune Thrombocytopenic Purpura
The matching correctly pairs distinct clinical vignettes and pathognomonic laboratory or peripheral smear findings with their definitive underlying hematologic diagnoses based on established pathophysiology.

Step-by-Step Solution

1
Analyze the hematologic features associated with bone marrow fibrosis.
Identify that teardrop cells and a dry tap indicate Primary Myelofibrosis.
Fibrotic marrow forces red blood cells to squeeze out, forming teardrop shapes (dacrocytes).
2
Evaluate the bleeding disorder characterized by mucosal bleeding and prolonged bleeding time with normal coagulation times.
Match these symptoms with von Willebrand Disease.
Deficiency in von Willebrand factor impairs platelet adhesion, prolonging bleeding time without necessarily affecting PT or aPTT.
3
Examine the hypercoagulable state resistant to activated protein C.
Identify this as Factor V Leiden.
A genetic mutation in Factor V makes it resistant to cleavage by activated protein C, leading to thrombosis.
4
Review the triad of bone pain, hypercalcemia, and rouleaux formation.
Correlate these findings with Multiple Myeloma.
Excess monoclonal proteins cause RBCs to stack (rouleaux), while plasma cell proliferation causes lytic bone lesions and hypercalcemia.
5
Assess the presentation of isolated thrombocytopenia with normal coagulation studies.
Diagnose Immune Thrombocytopenic Purpura.
Autoantibody destruction of platelets leads to thrombocytopenia without affecting the coagulation cascade.

Key Concept

Clinical and laboratory diagnosis of common hematologic and oncologic disorders.
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