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Question 381Question →

Match each pediatric patient's clinical presentation with the most accurate developmental assessment or underlying etiology.

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Items

An 18-month-old with a vocabulary of 3 words, who points to desired objects, follows one-step verbal commands, and has normal hearing testing.
A 14-month-old who crawls efficiently and cruises along furniture but has not yet taken independent steps; neurologic examination is normal.
A 9-month-old who sits only when propped, demonstrates a persistent Moro reflex, and exhibits increased muscle tone in the lower extremities.
A 24-month-old whose weight has dropped from the 50th to the 5th percentile over 6 months, while length and head circumference remain at the 50th percentile.

Matches

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Answer

The presentations map directly to their specific assessments: the 18-month-old has an isolated expressive language delay; the 14-month-old shows a normal gross motor variation; the 9-month-old exhibits signs of upper motor neuron pathology; and the 24-month-old displays growth chart patterns characteristic of inadequate caloric intake.
Each patient presentation contains specific clues differentiating normal variations from pathology. The 18-month-old has a specific expressive language delay but normal receptive and social skills. The 14-month-old is within the normal 12-18 month window for achieving independent walking. The 9-month-old has pathologic retention of the Moro reflex, which should resolve by 4-6 months, pointing to an upper motor neuron lesion. The 24-month-old's asymmetric growth restriction (weight drops before height/head circumference) is the classic pattern for nutritional failure to thrive.

Step-by-Step Solution

1
Analyze the 18-month-old's milestones.
Identified expressive language delay (only 3 words) with preserved social (pointing) and receptive (following commands) milestones.
Differentiates an isolated speech delay from autism spectrum disorder or global developmental delay.
2
Evaluate the 14-month-old's gross motor skills.
Recognized that cruising is age-appropriate and independent walking is not considered delayed until 18 months of age.
Prevents unnecessary diagnostic testing for normal developmental variations.
3
Assess the 9-month-old's neurologic findings.
Identified delayed motor milestones (cannot sit alone) and a retained primitive reflex (Moro) with hypertonia.
Retained primitive reflexes beyond 6 months indicate upper motor neuron pathology, such as cerebral palsy, requiring further neurologic workup.
4
Interpret the 24-month-old's growth parameters.
Noted isolated weight deceleration with preserved length and head circumference.
This specific sequence (weight dropping first) is the hallmark of inadequate caloric intake (Type 1 failure to thrive).

Key Concept

Accurate assessment of normal variations, specific milestone delays, and distinct red flags in pediatric growth and development is essential for timely intervention and avoiding unnecessary testing.
Question 382Question →

Match each of the following patient clinical vignettes to the most likely specific vasculitis diagnosis.

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Items

A 35-year-old man with chronic sinusitis, hemoptysis, and acute kidney injury; testing reveals c-ANCA (PR3-ANCA) positivity.
A 40-year-old man with a history of severe adult-onset asthma and allergic rhinitis presents with a new-onset foot drop; p-ANCA (MPO-ANCA) is positive.
A 45-year-old man with postprandial abdominal pain, livedo reticularis, and a recent hepatitis B infection; ANCA testing is negative.
A 25-year-old woman presents with upper extremity claudication, absent radial pulses, and systemic constitutional symptoms; ESR is markedly elevated.
A 7-year-old boy presents with abdominal pain, diffuse arthralgia, and a palpable purpuric rash on his buttocks and lower extremities following an upper respiratory tract infection.

Matches

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Answer

The presentations match as follows: the c-ANCA positive patient with respiratory/renal disease matches Granulomatosis with polyangiitis; the p-ANCA positive asthmatic with foot drop matches Eosinophilic granulomatosis with polyangiitis; the Hepatitis B positive patient with abdominal angina matches Polyarteritis nodosa; the young pulseless woman matches Takayasu arteritis; and the child with purpura matches IgA vasculitis.
The diagnosis of systemic vasculitis relies heavily on recognizing distinct clinical syndromes. Granulomatosis with polyangiitis classically presents with upper respiratory tract disease, lower respiratory tract disease, and glomerulonephritis, alongside c-ANCA (PR3) positivity. Eosinophilic granulomatosis with polyangiitis is distinguished by asthma, allergic rhinitis, and eosinophilia, typically with p-ANCA (MPO) positivity. Polyarteritis nodosa is a medium-vessel vasculitis that typically spares the lungs, frequently involves the mesenteric and renal arteries, and has a known strong association with hepatitis B infection. Takayasu arteritis involves the aorta and its major branches, frequently causing arm claudication and absent pulses in young women. IgA vasculitis is the most common childhood vasculitis, recognized by the distinct tetrad of palpable purpura on gravity-dependent areas, arthralgia, abdominal pain, and renal involvement.

Step-by-Step Solution

1
Analyze each patient's demographic profile, organ system involvement, and serological findings.
Identified unique patterns such as c-ANCA with lung/renal involvement, p-ANCA with asthma/neuropathy, Hepatitis B association, pulseless disease in a young woman, and a pediatric lower-extremity purpuric rash.
Systemic vasculitides are categorized by vessel size and present with distinct, recognizable syndromic clusters.
2
Match the identified syndromic clusters to the established diagnostic criteria for systemic vasculitides.
The vignettes correctly pair with their respective small, medium, and large vessel vasculitic syndromes.
Accurate diagnosis based on clinical and laboratory patterns dictates the specific therapeutic intervention and prognostic counseling.

Key Concept

Clinical recognition and differentiation of systemic vasculitides based on vessel size, specific organ involvement, demographic factors, and serological markers.
Question 383Question →

A pediatrician is analyzing the growth charts and skeletal maturation data of several patients. Match each described clinical growth trajectory with its most likely underlying etiology.

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Items

Weight trajectory acutely crosses two major percentiles downward; length and head circumference track normally
Linear growth decelerates crossing percentiles downward; weight percentile continues to increase or remains stable
Height and weight consistently track along the 5th percentile since birth; bone age is equal to chronological age
Height tracks below the 3rd percentile with normal annual growth velocity; bone age is significantly delayed

Matches

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Answer

Weight drop with normal height matches Nutritional insufficiency. Height drop with normal/increased weight matches Endocrinologic abnormality. Consistently small with normal bone age matches Familial short stature. Consistently small with delayed bone age matches Constitutional growth delay.
Growth parameters provide essential clues to the etiology of abnormal growth. Weight dropping first implies insufficient calories (the body preserves bone growth over fat/muscle). Height dropping while weight is maintained or increased points to endocrine issues (loss of linear growth drive with decreased metabolism). Consistently small size with a normal bone age indicates genetic potential (familial short stature), whereas a delayed bone age with normal growth velocity indicates a delayed pubertal spurt (constitutional growth delay).

Step-by-Step Solution

1
Analyze the relationship between weight and height trajectories.
Identify whether weight drops first (nutritional) or height drops first (endocrine).
The body prioritizes brain and linear growth over fat storage during caloric restriction, whereas endocrine signals are required for continuous bone lengthening.
2
Evaluate patients with consistently low, symmetrical growth parameters.
Differentiate based on skeletal maturation (bone age).
Both familial short stature and constitutional delay present with low percentiles and normal growth velocity, making bone age the definitive differentiating factor.
3
Match the specific bone age findings to the respective genetic or maturational pattern.
Normal bone age matches with familial short stature, while delayed bone age matches with constitutional growth delay.
Delayed bone age indicates a prolonged growth window, whereas normal bone age indicates genetic realization of a shorter final height.

Key Concept

Interpretation of pediatric growth chart trajectories and bone age to differentiate between nutritional, endocrine, familial, and constitutional causes of growth alterations.
Estimated Time:1m 30s
Question 384Question →

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

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Items

A 24-year-old woman with menorrhagia and epistaxis; laboratory studies show a normal PT, prolonged aPTT, and prolonged bleeding time.
A 6-year-old boy with a swollen, painful knee after a minor fall; laboratory studies show a normal PT, prolonged aPTT, and normal bleeding time. A mixing study with normal plasma fully corrects the aPTT.
A 65-year-old man with unprovoked, extensive soft tissue bleeding; laboratory studies show a normal PT, prolonged aPTT, and normal bleeding time. A mixing study with normal plasma fails to correct the aPTT.
A 32-year-old woman with placental abruption who develops continuous oozing from venipuncture sites; laboratory studies show prolonged PT, prolonged aPTT, thrombocytopenia, and low fibrinogen.

Matches

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Answer

The correct matches correlate von Willebrand disease with combined primary and secondary hemostasis defects, Hemophilia A with a correctable prolonged aPTT, acquired factor VIII inhibitor with an uncorrectable prolonged aPTT, and DIC with consumptive coagulopathy.
Each clinical scenario presents a distinct coagulopathy. von Willebrand disease affects both primary hemostasis and factor VIII stability. Hemophilia represents a true factor deficiency that corrects with normal plasma. Acquired inhibitors neutralize coagulation factors, resisting correction in mixing studies. DIC causes global depletion of coagulation factors, fibrinogen, and platelets.

Step-by-Step Solution

1
Analyze the bleeding pattern.
Mucocutaneous bleeding (epistaxis, menorrhagia) suggests a primary hemostatic defect, whereas deep tissue bleeding (hemarthrosis, large hematomas) suggests a secondary hemostatic (coagulation factor) defect.
Bleeding phenotype helps initially categorize the disorder.
2
Interpret the PT and aPTT.
An isolated prolonged aPTT points to the intrinsic pathway (factors VIII, IX, XI, XII). Prolongation of both PT and aPTT indicates a common pathway defect or consumptive process.
PT evaluates the extrinsic pathway, while aPTT evaluates the intrinsic pathway.
3
Evaluate the results of the mixing study for isolated prolonged aPTT.
Correction implies a factor deficiency, while failure to correct implies the presence of an inhibitor (such as an autoantibody).
Mixing studies differentiate between missing factors and neutralizing antibodies.

Key Concept

Interpretation of coagulation panels (PT, aPTT, bleeding time) and mixing studies to differentiate hemostatic disorders.
Question 385Question →

Match each immunocompromised patient scenario with the most appropriate antimicrobial prophylaxis or maintenance regimen.

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Items

A 34-year-old with HIV, CD4 count 85 cells/mm³, positive Toxoplasma gondii IgG, severe sulfonamide allergy (Stevens-Johnson syndrome), and known glucose-6-phosphate dehydrogenase (G6PD) deficiency.
A 41-year-old with HIV, CD4 count 40 cells/mm³, positive Toxoplasma gondii IgG, sulfonamide-induced anaphylaxis, and normal G6PD enzyme levels.
A 29-year-old with HIV, CD4 count 180 cells/mm³, asymptomatic, positive interferon-gamma release assay, and a clear chest radiograph.
A 38-year-old with HIV, CD4 count 80 cells/mm³, asymptomatic, who just completed 2 weeks of induction therapy with liposomal amphotericin B and flucytosine for meningoencephalitis.

Matches

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Answer

The correct pairings match Patient 1 with atovaquone monotherapy, Patient 2 with dapsone, pyrimethamine, and leucovorin, Patient 3 with isoniazid and pyridoxine, and Patient 4 with fluconazole monotherapy.
Each patient scenario is correctly matched to a regimen by assessing the pathogen targets required by the CD4 count and patient history, and then navigating the specific pharmacological contraindications (such as G6PD deficiency and severe sulfa allergies) to find the safest and most effective standard-of-care regimen.

Step-by-Step Solution

1
Analyze Patient 1's profile: CD4 85 cells/mm³ with positive Toxoplasma IgG.
The patient requires primary prophylaxis for both Pneumocystis jirovecii and Toxoplasma gondii.
Guidelines recommend PCP prophylaxis at CD4 < 200 cells/mm³ and Toxoplasma prophylaxis at CD4 < 100 cells/mm³.
2
Evaluate Patient 1's contraindications: sulfa allergy and G6PD deficiency.
Atovaquone monotherapy is selected.
Trimethoprim-sulfamethoxazole cannot be used due to sulfa allergy. Dapsone cannot be used due to the high risk of oxidative hemolytic anemia in G6PD deficiency. Atovaquone covers both pathogens and is safe in G6PD deficiency.
3
Analyze Patient 2's profile: CD4 40 cells/mm³ with positive Toxoplasma IgG, sulfa allergy, but normal G6PD levels.
Dapsone, pyrimethamine, and leucovorin are selected.
With normal G6PD, dapsone is safe to use for PCP prophylaxis. Pyrimethamine is added for Toxoplasma coverage, and leucovorin prevents bone marrow suppression caused by pyrimethamine.
4
Analyze Patient 3's profile: Positive interferon-gamma release assay (IGRA) and clear chest radiograph.
Diagnosis is latent tuberculosis infection (LTBI); isoniazid and pyridoxine are selected.
Active TB must be ruled out before treating LTBI. The clear radiograph does this, making isoniazid plus pyridoxine the standard prophylactic treatment to prevent active disease.
5
Analyze Patient 4's profile: Completed induction therapy for cryptococcal meningoencephalitis.
Fluconazole monotherapy is selected for secondary prophylaxis.
Cryptococcal infection requires prolonged consolidation and maintenance (secondary prophylaxis) therapy with fluconazole to prevent relapse until immune reconstitution occurs with antiretroviral therapy.

Key Concept

Selection of appropriate opportunistic infection prophylaxis and maintenance therapy in immunocompromised patients, tailored to specific medication allergies and enzyme deficiencies.
Question 386Question →

Match each clinical exposure scenario with the most appropriate post-exposure prophylaxis or initial preventive management strategy.

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Items

Healthcare worker with no prior vaccination sustains a needlestick injury from a patient who is HBsAg-positive.
College student who shared a dormitory room with a peer recently diagnosed with Neisseria meningitidis meningitis.
Camper who awakens to find a bat in their tent but has no visible bite marks.
Hiker in the northeastern United States who removes an engorged Ixodes scapularis tick that was attached for approximately 48 hours.

Matches

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Answer

Each specific exposure scenario must be matched with its guideline-directed post-exposure prophylaxis regimen.
Each exposure scenario carries a specific pathogen risk that mandates a targeted prophylactic strategy. Needlestick exposure to Hepatitis B in an unvaccinated host requires both passive (HBIG) and active (vaccine) immunity. Meningococcal meningitis close contacts need short-course antibiotics like ciprofloxacin to clear nasopharyngeal carriage. Bat exposures, due to the subtle nature of their bites and the fatal outcome of rabies, require both RIG and rabies vaccine. Finally, an Ixodes tick attached for greater than 36 hours in an endemic area meets the criteria for a single prophylactic dose of doxycycline.

Step-by-Step Solution

1
Analyze each clinical exposure scenario to determine the primary infectious pathogen risk.
Pathogens identified include Hepatitis B virus, Neisseria meningitidis, Rabies virus, and Borrelia burgdorferi.
Correct pathogen identification is essential for selecting the targeted prophylactic agent.
2
Recall the current evidence-based post-exposure prophylaxis protocol for each specific pathogen.
HBV requires HBIG and vaccine; Meningococcus requires ciprofloxacin/rifampin/ceftriaxone; Rabies requires RIG and vaccine; Lyme requires single-dose doxycycline.
Prophylactic strategies differ significantly, ranging from single-dose antibiotics to combination passive and active immunizations.
3
Match the clinical scenario to the appropriate prophylactic regimen.
The exact therapeutic matches are established for all four clinical scenarios.
This completes the required assessment task.

Key Concept

Post-exposure prophylaxis (PEP) protocols for common infectious disease exposures
Question 387Question →

Match each jugular venous pulse (JVP) waveform abnormality with the cardiac pathology it most specifically represents.

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Items

Intermittent cannon 'a' waves
Large, prominent 'v' waves (c-v waves)
Prominent 'x' descent with an absent or blunted 'y' descent
Rapid, steep 'y' descent (Friedreich's sign)
Prominent 'a' waves with a slow, prolonged 'y' descent

Matches

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Answer

Intermittent cannon 'a' waves match with Complete atrioventricular block; Large 'v' waves match with Severe tricuspid regurgitation; Prominent 'x' with absent 'y' descent matches with Cardiac tamponade; Rapid 'y' descent matches with Constrictive pericarditis; and Prominent 'a' waves with slow 'y' descent match with Tricuspid stenosis.
The JVP waveform directly reflects right-sided cardiac hemodynamics. The 'a' wave corresponds to atrial contraction, the 'v' wave to venous filling against a closed tricuspid valve, and the 'y' descent to early passive right ventricular filling. Specific pathologies disrupt these physiological phases to produce characteristic waveform alterations.

Step-by-Step Solution

1
Analyze the 'a' wave abnormalities
Intermittent cannon 'a' waves are matched with AV dissociation (complete heart block), while prominent, regular 'a' waves are matched with obstruction to right atrial emptying (tricuspid stenosis).
The 'a' wave represents right atrial contraction. Contraction against a closed valve produces a massive ('cannon') wave, whereas contraction against a stenotic valve produces a consistently prominent wave.
2
Analyze the 'v' wave abnormalities
Large, prominent 'v' waves are matched with severe tricuspid regurgitation.
The 'v' wave represents venous filling of the right atrium during ventricular systole. Regurgitant flow significantly augments this wave, often merging it with the 'c' wave.
3
Differentiate the 'y' descent abnormalities in pericardial diseases
An absent or blunted 'y' descent is matched with cardiac tamponade, while a rapid, steep 'y' descent is matched with constrictive pericarditis.
The 'y' descent represents early passive right ventricular filling. Tamponade restricts filling throughout diastole (blunting the 'y' descent), while constriction allows rapid early filling before an abrupt halt (steep 'y' descent).

Key Concept

Jugular venous pulse (JVP) waveform interpretation and hemodynamic correlation
Question 388Question →

Match each clinical presentation of an oncologic emergency with the most appropriate next step in management.

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Items

A patient with small cell lung cancer develops new-onset confusion and lethargy; laboratory studies reveal a serum sodium of 118118 mEq/L.
A patient undergoing induction chemotherapy for high-grade lymphoma develops acute oliguria, hyperkalemia, hyperphosphatemia, and hypocalcemia.
A patient with advanced squamous cell carcinoma of the lung presents with worsening lethargy, severe constipation, and a serum calcium level of 14.814.8 mg/dL.
A patient with non-small cell lung cancer presents with progressively worsening dyspnea, facial plethora, and prominent venous distention over the neck and chest.
A patient day 1010 post-chemotherapy presents with a temperature of 38.9∘38.9^\circ C (102.0∘102.0^\circ F) and an absolute neutrophil count of 300300/mm 3^3.

Matches

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Answer

The correct matches are: SIADH with fluid restriction and hypertonic saline; Tumor Lysis Syndrome with aggressive hydration and rasburicase or allopurinol; Hypercalcemia of malignancy with isotonic saline, calcitonin, and bisphosphonates; SVC syndrome with head elevation and radiation or stenting; and Febrile neutropenia with immediate blood cultures and broad-spectrum antibiotics.
Matching each oncologic emergency with its definitive initial management requires recognizing the underlying pathophysiology. SIADH requires sodium correction; Tumor Lysis Syndrome necessitates renal protection from uric acid and phosphate crystals; hypercalcemia demands aggressive rehydration to counter volume depletion; SVC syndrome needs mechanical or radiologic relief of venous obstruction; and febrile neutropenia requires immediate empiric antimicrobial coverage to prevent overwhelming sepsis.

Step-by-Step Solution

1
Analyze the clinical and laboratory findings for the patient with small cell lung cancer.
Identify SIADH presenting with severe hyponatremia.
To determine the need for careful sodium correction via fluid restriction and hypertonic saline.
2
Evaluate the metabolic derangements in the patient receiving induction chemotherapy.
Recognize the classic electrolyte pattern of Tumor Lysis Syndrome.
To direct therapy towards massive hydration and uric acid reduction.
3
Assess the severe hypercalcemia in the context of squamous cell lung cancer.
Determine the critical necessity for immediate volume expansion.
To correct dehydration and facilitate renal calcium clearance before administering targeted therapies like bisphosphonates.
4
Identify the cause of facial plethora and venous distention in the lung cancer patient.
Diagnose Superior Vena Cava (SVC) syndrome.
To prioritize obstructive relief via radiation or endovascular stenting.
5
Recognize the urgency of a fever in a severely neutropenic patient.
Identify febrile neutropenia.
To emphasize the absolute need for immediate antipseudomonal antibiotic therapy without waiting for culture results.

Key Concept

Recognition and appropriate initial management of high-yield oncologic emergencies.
Question 389Question →

Match each clinical presentation of an immunocompromised patient with HIV to the most appropriate initial targeted antimicrobial regimen.

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Items

A 32-year-old man with a CD4 count of 45 cells/mm³ presenting with decreased visual acuity, floaters, and yellow-white retinal exudates with associated hemorrhage.
A 45-year-old man with a CD4 count of 90 cells/mm³ presenting with new-onset seizures, focal left-sided weakness, and multiple ring-enhancing lesions with surrounding edema on brain MRI.
A 35-year-old man with a CD4 count of 150 cells/mm³ presenting with a 3-week history of dry cough, exertional dyspnea, hypoxemia, and bilateral ground-glass opacities on high-resolution chest CT.
A 38-year-old man with a CD4 count of 80 cells/mm³ presenting with subacute headache, fever, lethargy, and cerebrospinal fluid analysis showing an elevated opening pressure and encapsulated yeast on India ink stain.

Matches

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Answer

Cytomegalovirus retinitis is treated with valganciclovir. Toxoplasma encephalitis is treated with sulfadiazine, pyrimethamine, and leucovorin. Pneumocystis jirovecii pneumonia is treated with trimethoprim-sulfamethoxazole. Cryptococcal meningitis is treated with amphotericin B and flucytosine.
Each clinical scenario correctly aligns a classic opportunistic infection presentation with its established first-line therapeutic regimen. CMV retinitis is managed with valganciclovir. Toxoplasmosis requires sulfadiazine and pyrimethamine. PCP is effectively treated with high-dose trimethoprim-sulfamethoxazole. Cryptococcal meningitis induction mandates amphotericin B and flucytosine.

Step-by-Step Solution

1
Analyze the CD4 count and specific clinical manifestations for each patient to identify the underlying opportunistic pathogen.
Pathogens identified: Cytomegalovirus, Toxoplasma gondii, Pneumocystis jirovecii, and Cryptococcus neoformans.
Accurate identification of the specific opportunistic infection is an essential prerequisite for selecting the appropriate targeted antimicrobial therapy.
2
Determine the guideline-directed first-line pharmacological treatment for each identified infection.
Matched therapies: Valganciclovir for CMV; Sulfadiazine/pyrimethamine/leucovorin for Toxoplasma; TMP-SMX for PCP; Amphotericin B/flucytosine for Cryptococcus.
Standard of care requires these specific regimens to maximize efficacy, ensure CNS penetration where necessary, and minimize disease progression.
3
Pair each clinical vignette with its corresponding treatment regimen.
All four clinical presentations are successfully matched to their respective first-line therapies.
To synthesize the clinical diagnostic findings with the correct pharmacological management.

Key Concept

Targeted treatment of opportunistic infections in HIV/AIDS based on characteristic clinical presentations and specific CD4 count thresholds.
Question 390Question →

Match each gastrointestinal or hepatobiliary clinical scenario with the most appropriate antimicrobial stewardship strategy or treatment plan.

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Items

A 45-year-old healthy man with CT-confirmed, mild uncomplicated acute diverticulitis who is afebrile and tolerating oral intake.
A 58-year-old man with cirrhosis who completed 5 days of IV cefotaxime for an episode of spontaneous bacterial peritonitis and is now asymptomatic.
A 62-year-old woman with a percutaneously drained pyogenic liver abscess (growing Klebsiella) who is clinically stable after 5 days of IV ceftriaxone.
A 70-year-old woman with an initial, non-severe episode of Clostridioides difficile infection following clindamycin use.
A 50-year-old man with decompensated cirrhosis who is admitted to the ICU after successful endoscopic band ligation for acute variceal bleeding.

Matches

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Answer

The correct matches align each distinct clinical scenario with its evidence-based antimicrobial duration, route, and indication based on current stewardship guidelines.
Each match accurately reflects current society guidelines and antimicrobial stewardship principles: observation for mild diverticulitis, de-escalation for stable abscesses, indefinite prophylaxis for resolved SBP, enteral agents for C. difficile, and short-course IV prophylaxis for cirrhotic GI bleeding.

Step-by-Step Solution

1
Analyze the acute diverticulitis scenario.
Identify mild, uncomplicated diverticulitis in an immunocompetent patient tolerating oral intake.
Recent guidelines favor avoiding unnecessary antibiotics in these specific patients, instead utilizing supportive outpatient care.
2
Evaluate the spontaneous bacterial peritonitis (SBP) scenario.
The patient has fully recovered from an initial episode of SBP and is ready for discharge.
SBP has a high recurrence rate; indefinite secondary prophylaxis with oral antibiotics is mandated.
3
Assess the pyogenic liver abscess scenario.
The patient is clinically stable after initial IV therapy, with known culture sensitivities.
Good antimicrobial stewardship requires de-escalating to oral therapy as soon as clinically feasible to complete the prolonged 4-6 week course.
4
Determine the Clostridioides difficile treatment plan.
The patient presents with a first-time, non-severe episode of C. difficile colitis.
Standard therapy involves targeted enteral (oral) administration of fidaxomicin or vancomycin for 10 days; IV antibiotics are ineffective for this indication.
5
Review the variceal bleeding scenario.
A patient with cirrhosis is admitted with an acute gastrointestinal hemorrhage.
GI bleeding in cirrhosis severely impairs immune function. A prophylactic 7-day course of IV ceftriaxone prevents translocational infections and improves survival.

Key Concept

Evidence-based antimicrobial stewardship and management in gastrointestinal and hepatobiliary infections
Estimated Time:2m 30s
Question 391Question →

Match each clinical presentation of an acute abdominal condition with its most appropriate initial definitive management step.

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Items

A 45-year-old patient with a history of open appendectomy presents with crampy abdominal pain and dilated small bowel loops, but has normal vital signs and a soft, non-peritonitic abdomen.
A 68-year-old patient with prior pelvic surgery presents with obstipation, feculent emesis, and new-onset focal abdominal guarding, fever, and leukocytosis.
A 61-year-old patient experiences sudden, severe, diffuse abdominal pain, presenting with a rigid, board-like abdomen and subdiaphragmatic free air on upright radiograph.
A 58-year-old patient presents with fever and progressive left lower quadrant pain; imaging demonstrates a 4.5-cm rim-enhancing fluid collection adjacent to the sigmoid colon.

Matches

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Answer

The correct matches align the underlying surgical pathology to the standard of care: uncomplicated bowel obstruction to conservative management, strangulated obstruction to surgical adhesiolysis, perforated viscus to omental patch repair, and diverticular abscess to percutaneous drainage.
Each clinical scenario maps directly to its evidence-based surgical or interventional treatment guideline. Uncomplicated obstructions safely undergo a trial of non-operative management, whereas signs of strangulation or perforation mandate immediate laparotomy. Large localized abscesses in diverticulitis are drained percutaneously to minimize surgical morbidity.

Step-by-Step Solution

1
Evaluate the clinical status of the patient with a history of prior surgery and dilated bowel loops.
The absence of peritonitis or systemic toxicity indicates an uncomplicated small bowel obstruction.
Differentiating uncomplicated from complicated obstruction determines if conservative management is safe.
2
Assess the patient presenting with obstipation, feculent emesis, and focal guarding.
The presence of fever, leukocytosis, and localized peritonitis points to a strangulated small bowel obstruction.
Strangulation implies bowel ischemia, which is an absolute indication for emergent surgical exploration.
3
Identify the pathology causing a rigid abdomen and subdiaphragmatic free air.
These findings are classic for a perforated viscus, such as a peptic ulcer.
A perforated ulcer leaks gastrointestinal contents into the peritoneum, requiring immediate washout and omental patch repair.
4
Determine the management for a 4.5-cm pericolic fluid collection in the setting of left lower quadrant pain.
The fluid collection represents a diverticular abscess.
Abscesses larger than 3 cm are best managed initially with percutaneous drainage to resolve the acute infection and avoid urgent colostomy.

Key Concept

Triage and definitive management of acute abdominal emergencies based on hemodynamic status and specific pathologic findings.
Question 392Question →

Match each pediatric patient scenario with the most appropriate specific preventive care or immunization recommendation.

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Items

A 4-year-old boy with sickle cell anemia who is otherwise healthy.
A 15-month-old girl receiving daily tacrolimus following a liver transplant.
A 6-month-old boy born prematurely at 28 weeks gestation with no chronic medical conditions.
A 12-year-old girl recently diagnosed with a terminal complement component (C5-C9) deficiency.

Matches

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Answer

Sickle cell anemia pairs with daily prophylactic penicillin V. Liver transplant on tacrolimus pairs with contraindication to live-attenuated vaccines. The preterm infant pairs with routine childhood immunizations according to chronological age. Terminal complement deficiency pairs with both MenACWY and MenB vaccines.
Each listed high-risk pediatric condition demands tailored preventive care. Sickle cell disease causes early functional asplenia, heavily relying on penicillin prophylaxis. Immunosuppression for solid organ transplants creates profound cellular immunodeficiency, strongly contraindicating live vaccines. Prematurity requires standard, prompt vaccination by chronological age to close vulnerability windows. Finally, terminal complement deficiency uniquely impairs the membrane attack complex, necessitating broad and aggressive meningococcal vaccination coverage.

Step-by-Step Solution

1
Analyze the preventive needs for the patient with sickle cell disease.
Identified a severe risk of functional asplenia.
Functional asplenia requires rigorous pneumococcal vaccination and prophylactic penicillin V until 5 years of age.
2
Evaluate the immune status of the liver transplant recipient.
Identified severe iatrogenic immunosuppression.
Maintenance immunosuppressive medications like tacrolimus strictly contraindicate the administration of live-attenuated vaccines.
3
Determine the optimal vaccination protocol for the premature infant.
Identified standard chronological age scheduling.
Premature infants should not be subjected to delayed schedules; they must receive vaccines based strictly on their chronological age.
4
Identify the primary infectious risk associated with a terminal complement deficiency.
Identified an isolated, profound susceptibility to encapsulated organisms, particularly Neisseria meningitidis.
The inability to form the membrane attack complex explicitly requires targeted and comprehensive meningococcal vaccination (MenACWY and MenB).

Key Concept

Tailored immunization and preventive care protocols for high-risk pediatric populations (functional asplenia, severe immunosuppression, prematurity, and specific immunodeficiencies).
Question 393Question →

Match each classic auscultatory finding with its most likely underlying valvular pathology.

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Items

Harsh crescendo-decrescendo systolic murmur at the right upper sternal border radiating to the carotids
Holosystolic, high-pitched blowing murmur at the apex radiating to the axilla
Mid-diastolic, low-pitched rumbling murmur with a preceding opening snap heard best at the apex
Early diastolic, high-pitched decrescendo murmur heard best at the left sternal border while the patient is leaning forward

Matches

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Answer

The auscultatory findings map to their respective valvular lesions based on murmur timing, character, location of maximal intensity, and typical radiation patterns.
Each auscultatory finding corresponds to a specific hemodynamic derangement. Aortic stenosis creates an ejection murmur due to a narrowed valve orifice. Mitral regurgitation allows systolic backflow, creating a holosystolic murmur. Mitral stenosis obstructs diastolic ventricular filling, yielding a rumble and an opening snap. Aortic regurgitation permits diastolic backflow, producing a decrescendo murmur.

Step-by-Step Solution

1
Analyze the timing and location of the crescendo-decrescendo systolic murmur.
The murmur is at the right upper sternal border with carotid radiation, mapping to aortic valve stenosis.
Turbulent blood flow across a narrowed aortic valve during ventricular systole creates this classic ejection murmur.
2
Evaluate the holosystolic apical murmur.
The murmur radiates to the axilla, mapping to mitral valve regurgitation.
Retrograde blood flow from the left ventricle into the left atrium throughout the entirety of systole produces a blowing holosystolic murmur.
3
Assess the diastolic murmur with an opening snap.
The opening snap and mid-diastolic rumble at the apex map to mitral valve stenosis.
The sudden tensing of the fibrotic mitral valve leaflets causes the snap, followed by turbulent flow into the ventricle during diastole.
4
Examine the early diastolic decrescendo murmur.
Heard at the left sternal border, especially while leaning forward, this maps to aortic valve regurgitation.
Backflow from the higher-pressure aorta into the left ventricle during diastole creates this high-pitched decrescendo murmur.

Key Concept

Valvular Heart Disease Auscultation
Estimated Time:1m 0s
Question 394Question →

Match each patient's adrenal and pituitary laboratory profile with the most likely underlying pathophysiologic diagnosis.

Click a left item, then click its matching right item

Items

Low 88 AM serum cortisol, elevated plasma ACTH, hyponatremia, hyperkalemia, and elevated plasma renin activity
Low 88 AM serum cortisol, inappropriately normal or low plasma ACTH, normal serum electrolytes, and normal plasma renin activity
Elevated 2424-hour urine free cortisol, suppressed plasma ACTH, and lack of cortisol suppression with low-dose dexamethasone
Elevated 2424-hour urine free cortisol, elevated plasma ACTH, and >50%>50\% suppression of serum cortisol following a high-dose dexamethasone suppression test

Matches

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Answer

The profiles match as follows: primary adrenal insufficiency shows pan-cortical failure (high ACTH, high renin, abnormal electrolytes); secondary adrenal insufficiency shows isolated glucocorticoid failure (low ACTH, normal renin/electrolytes); ACTH-independent Cushing syndrome shows high cortisol with suppressed ACTH; and pituitary Cushing disease shows high cortisol, high ACTH, and suppression with high-dose dexamethasone.
Correct matching requires applying principles of endocrine feedback loops. Primary gland failures (adrenal insufficiency, adrenal adenoma) show an inverse relationship between the stimulating hormone (ACTH) and the peripheral hormone (cortisol). Central defects (pituitary failure, Cushing disease) show concordant changes. Furthermore, the functional independence of the zona glomerulosa (aldosterone) from ACTH allows distinction between primary and secondary adrenal insufficiency, while the relative feedback resistance of pituitary adenomas allows distinction from ectopic ACTH syndromes.

Step-by-Step Solution

1
Analyze the relationship between cortisol and ACTH to determine the primary defect.
Inverse relationships (e.g., low cortisol/high ACTH or high cortisol/low ACTH) indicate primary adrenal pathology. Direct relationships (e.g., low cortisol/low ACTH or high cortisol/high ACTH) indicate central (pituitary or ectopic) pathology.
The hypothalamic-pituitary-adrenal axis uses negative feedback, making paired hormone evaluation essential for localization.
2
Evaluate mineralocorticoid function via serum electrolytes and plasma renin activity in cases of adrenal insufficiency.
Hyponatremia, hyperkalemia, and high renin distinguish primary adrenal failure from secondary (pituitary) failure, where these parameters remain normal.
Aldosterone secretion is primarily regulated by the renin-angiotensin system and serum potassium levels, functioning independently of pituitary ACTH.
3
Differentiate the source of ACTH-dependent hypercortisolism using the high-dose dexamethasone suppression test.
Suppression of cortisol greater than 50%50\% points to a pituitary adenoma (Cushing disease), whereas lack of suppression suggests an ectopic ACTH source.
Pituitary corticotroph adenomas retain partial sensitivity to glucocorticoid negative feedback, which is overwhelmed only by high doses of dexamethasone.

Key Concept

The diagnostic approach to adrenal axis disorders relies on paired hormone testing (Cortisol/ACTH) to localize the defect and assessing parallel pathways (renin-aldosterone) or feedback sensitivity (dexamethasone suppression) to determine the exact etiology.
Question 395Question →

Match each clinical scenario involving confidentiality, public health, or mandatory reporting with the most appropriate legally required next step in management.

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Items

A 35-year-old patient newly diagnosed with sputum-smear-positive pulmonary tuberculosis who refuses treatment and states they will board a commercial flight tomorrow.
A 29-year-old competent adult who presents with defensive bruises, admits their romantic partner inflicted them, and explicitly forbids the physician from contacting authorities.
A 21-year-old patient presenting with a gunshot wound to the calf, who insists it was a cleaning accident and demands complete confidentiality to avoid losing their firearms license.
A 78-year-old patient with severe Alzheimer dementia presenting with unexplained cigarette burns, whose full-time caregiver claims the patient injured themselves by wandering.

Matches

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Answer

Tuberculosis flight risk matches Public Health notification. Competent adult intimate partner violence matches maintaining confidentiality. Accidental gunshot wound matches Law Enforcement notification. Vulnerable adult with unexplained burns matches Adult Protective Services.
Each scenario tests a specific legal boundary of confidentiality. Tuberculosis is a reportable communicable disease handled by public health departments to prevent outbreaks. Competent adult intimate partner violence requires maintaining confidentiality while empowering the patient with resources. Gunshot wounds automatically trigger law enforcement reporting due to strict state laws. Abuse in a vulnerable adult with dementia triggers immediate Adult Protective Services reporting.

Step-by-Step Solution

1
Evaluate the autonomy and vulnerability of the patient in the scenario.
Competent adults retain autonomy; vulnerable populations (e.g., elders with severe dementia) require state protection.
Determines if protective agency reporting (Adult Protective Services) is legally warranted over patient consent.
2
Assess for statutory exceptions to confidentiality regarding specific mechanisms of injury.
Gunshot wounds carry blanket statutory reporting requirements to law enforcement.
Legal mandates for weapons-related injuries strictly supersede the standard duty of medical confidentiality.
3
Determine the communicable risk to the general public.
Highly transmissible diseases combined with high-risk behavior (e.g., active tuberculosis and impending air travel) constitute an imminent public health threat.
The duty to protect public health requires involving the department of public health for potential intervention, such as a travel ban or quarantine.

Key Concept

The ethical and legal boundaries of patient confidentiality, including mandatory reporting of specific infectious diseases, vulnerable population abuse, and weapon-related injuries.
Estimated Time:1m 30s
Question 396Question →

For each of the following patient encounters, select the most appropriate legally required reporting action or agency according to standard United States medical-legal guidelines.

Click a left item, then click its matching right item

Items

A 4-year-old girl is brought to the emergency department with patterned contact burns, and the caregiver provides an injury mechanism that is incompatible with the physical findings.
A 32-year-old man receives a confirmed positive nucleic acid amplification test result for Neisseria gonorrhoeae during a routine screening.
A 55-year-old competent woman presents with a fractured radius resulting from domestic violence, explicitly stating she does not want law enforcement involved.
A surgical resident observes that the attending surgeon has constricted pupils, slurred speech, and is acting erratically just before starting an operation.
An 82-year-old man with advanced dementia is transferred from a residential care facility with severe, unexplained malnutrition and multiple stage IV pressure ulcers.

Matches

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Answer

The correct matches align each clinical scenario with its statutory reporting requirement: child abuse to Child Protective Services, reportable communicable diseases to the Department of Public Health, competent adult intimate partner violence to maintaining confidentiality, physician impairment to the State Medical Board or Physician Health Program, and elder abuse to Adult Protective Services.
Mandatory reporting laws are designed to protect vulnerable populations and public health while balancing patient autonomy. Suspected child abuse (incompatible injuries in a minor) and elder abuse (severe neglect in a patient with dementia) must be reported to protective services. Gonorrhea is a classic reportable communicable disease requiring health department notification for epidemiological tracking. An impaired physician poses an immediate threat to patient safety and must be reported to the appropriate regulatory body. Conversely, competent adults experiencing intimate partner violence retain their right to confidentiality, and physicians should offer support and safety planning rather than reporting to law enforcement against their will.

Step-by-Step Solution

1
Identify the vulnerable population or public health risk present in each scenario.
Determined that the scenarios involve a minor (child abuse), a reportable STI (public health), a competent adult (intimate partner violence), an impaired colleague (patient safety), and an elderly patient with dementia (elder neglect).
Different categories of patients and risks trigger different legal and ethical obligations.
2
Apply specific mandatory reporting laws for minors, vulnerable adults, communicable diseases, and impaired professionals.
Matched the child, the elderly patient, the STI, and the impaired physician to their respective required reporting bodies.
Statutory mandates override standard patient confidentiality in these specific high-risk populations.
3
Recognize the exception for competent adults experiencing domestic violence.
Matched the intimate partner violence scenario to maintaining confidentiality and offering resources.
Without the involvement of a deadly weapon, competent adults have the right to refuse law enforcement involvement, and their autonomy must be respected.

Key Concept

Physicians must differentiate between mandatory reporting situations (child/elder abuse, certain infectious diseases, impaired colleagues) and situations where patient confidentiality must be maintained (competent victims of intimate partner violence).
Question 397Question →

Match each patient's clinical presentation and cerebrospinal fluid (CSF) analysis findings with the most appropriate targeted or empiric treatment regimen.

Click a left item, then click its matching right item

Items

A 22-year-old college student presents with fever, severe headache, nuchal rigidity, and a petechial rash. CSF reveals 1200 WBCs/µL (90% neutrophils), glucose 25 mg/dL, and protein 150 mg/dL.
A 65-year-old man presents with acute fever, confusion, and new-onset focal seizures. CSF reveals 150 WBCs/µL (95% lymphocytes), glucose 65 mg/dL, protein 80 mg/dL, and numerous erythrocytes.
A 45-year-old woman with advanced HIV (CD4 count = 30 cells/mm³) presents with subacute headache and lethargy. CSF reveals an opening pressure of 350 mm H2O, 50 WBCs/µL (90% lymphocytes), glucose 30 mg/dL, and protein 100 mg/dL.
A 30-year-old man recently emigrated from a highly endemic region presents with a 3-week history of low-grade fever, weight loss, and cranial nerve VI palsy. CSF reveals 300 WBCs/µL (predominantly lymphocytes), glucose 20 mg/dL, and protein 250 mg/dL.

Matches

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Answer

The correct pairings match each central nervous system infection's classic clinical phenotype and cerebrospinal fluid profile to its definitive or empiric antimicrobial therapy (bacterial to ceftriaxone/vancomycin, viral HSV to acyclovir, fungal cryptococcal to amphotericin/flucytosine, and mycobacterial to RIPE+steroids).
Each matching pair requires recognizing the classic clinical phenotype and CSF profile of a specific CNS infection to select the correct corresponding antimicrobial therapy. Bacterial meningitis presents with neutrophilic pleocytosis and hypoglycorrhachia. HSV encephalitis typically causes temporal lobe necrosis leading to RBCs in the CSF with a lymphocytic pleocytosis. Cryptococcal meningitis is associated with high opening pressures in immunocompromised hosts. TB meningitis typically presents subacutely with cranial nerve palsies, profound hypoglycorrhachia, and extremely high protein.

Step-by-Step Solution

1
Analyze the CSF profile and clinical presentation for the 22-year-old student.
Identification of a neutrophilic pleocytosis with low glucose and petechial rash, indicative of bacterial meningitis.
This classical presentation dictates immediate empiric therapy with broad-spectrum antibacterials covering S. pneumoniae and N. meningitidis.
2
Evaluate the 65-year-old man with confusion, seizures, and CSF erythrocytes.
Diagnosis of suspected HSV encephalitis, which requires empiric intravenous acyclovir.
Erythrocytes in a lymphocytic, normal-glucose CSF profile strongly suggest the hemorrhagic temporal lobe necrosis typical of HSV.
3
Assess the HIV-positive patient with an extremely high CSF opening pressure.
Diagnosis of cryptococcal meningitis, necessitating induction therapy with amphotericin B and flucytosine.
Cryptococcus uniquely causes severe intracranial hypertension with a mild lymphocytic pleocytosis in immunocompromised hosts.
4
Review the subacute presentation of cranial nerve palsy and highly elevated CSF protein in the immigrant patient.
Diagnosis of tuberculous meningitis, requiring RIPE therapy and dexamethasone.
Basilar exudates causing cranial neuropathies alongside subacute lymphocytic meningitis are the hallmark of CNS tuberculosis.

Key Concept

Cerebrospinal fluid (CSF) analysis interpretation and appropriate empiric therapy for central nervous system infections
Question 398Question →

Match each clinical presentation with its most likely underlying pathophysiological mechanism.

Click a left item, then click its matching right item

Items

A 35-year-old woman with fever, confusion, schistocytes on peripheral smear, and normal coagulation times
A 65-year-old man with massive splenomegaly, fatigue, and teardrop red blood cells on peripheral smear
A 70-year-old man with painless cervical lymphadenopathy, marked lymphocytosis, and smudge cells on smear
A 28-year-old man developing jaundice and dark urine after trimethoprim-sulfamethoxazole use, with bite cells
A 45-year-old woman with recurrent deep vein thromboses, pregnancy losses, and a prolonged PTT

Matches

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Answer

Each clinical presentation is matched to its corresponding pathognomonic mechanism.
Each clinical vignette provides pathognomonic clues for a specific hematologic disorder. TTP is caused by ADAMTS13 deficiency; Primary Myelofibrosis involves marrow fibrosis from abnormal megakaryocytes; CLL is a CD5+ B cell neoplasm; G6PD deficiency involves defective generation of reduced glutathione; and Antiphospholipid Syndrome is driven by autoantibodies against phospholipid-binding proteins.

Step-by-Step Solution

1
Analyze the first presentation (fever, confusion, schistocytes, normal PT/PTT)
Diagnose Thrombotic Thrombocytopenic Purpura (TTP)
The combination of microangiopathic hemolytic anemia and thrombocytopenia with normal coagulation parameters points to ADAMTS13 deficiency.
2
Analyze the second presentation (splenomegaly, teardrop cells)
Diagnose Primary Myelofibrosis
Teardrop cells form as red blood cells squeeze through a fibrotic marrow space.
3
Analyze the third presentation (elderly patient, lymphadenopathy, smudge cells)
Diagnose Chronic Lymphocytic Leukemia (CLL)
Smudge cells are fragile neoplastic B cells that rupture easily during blood smear preparation.
4
Analyze the fourth presentation (hemolysis after sulfa drug exposure, bite cells)
Diagnose Glucose-6-Phosphate Dehydrogenase (G6PD) deficiency
Oxidative damage precipitates hemoglobin (Heinz bodies), which splenic macrophages 'bite' out, leading to hemolysis.
5
Analyze the fifth presentation (thrombosis, miscarriages, prolonged PTT)
Diagnose Antiphospholipid Syndrome
Lupus anticoagulant falsely prolongs PTT in vitro, but causes hypercoagulability and thrombosis in vivo.

Key Concept

Pathophysiological mechanisms of classic hematologic and oncologic disorders based on their peripheral smear and clinical presentations.
Question 399Question →

Evaluate the following patient presentations, all of whom are found to have a non-anion gap metabolic acidosis. Match each patient's clinical and laboratory profile with the primary underlying pathophysiologic mechanism responsible for their condition.

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Items

A 35-year-old woman with recurrent calcium phosphate nephrolithiasis, a serum K+K^+ of 2.82.8 mEq/L, and a urine pH of 6.56.5.
A 42-year-old man with multiple myeloma, a serum K+K^+ of 3.13.1 mEq/L, a urine pH of 5.25.2, and isolated glycosuria.
A 68-year-old man with advanced diabetic nephropathy, a serum K+K^+ of 5.65.6 mEq/L, and a urine pH of 5.35.3.
A 24-year-old woman with chronic generalized weakness, a serum K+K^+ of 2.52.5 mEq/L, a urine pH of 5.05.0, and a negative urine anion gap.

Matches

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Answer

The correct pairings align the patient with nephrolithiasis and high urine pH to Type 1 RTA; the patient with myeloma and glycosuria to Type 2 RTA; the diabetic patient with hyperkalemia to Type 4 RTA; and the patient with a negative urine anion gap to gastrointestinal bicarbonate loss.
Each clinical vignette provides specific physiologic markers that pinpoint the source of the non-anion gap metabolic acidosis. Hyperkalemia isolates Type 4 RTA. Among the hypokalemic etiologies, an alkaline urine pH isolates Type 1 RTA. For the remaining hypokalemic and aciduric patients, a negative urine anion gap identifies extrarenal (GI) loss, while signs of Fanconi syndrome isolate Type 2 RTA.

Step-by-Step Solution

1
Analyze the potassium levels for each presentation of non-anion gap metabolic acidosis.
Three patients are hypokalemic, while the diabetic man is hyperkalemic.
Hyperkalemia in the setting of a non-anion gap metabolic acidosis is diagnostic of Type 4 RTA, separating it immediately from the other causes.
2
Evaluate the urine pH in the hypokalemic patients.
The woman with nephrolithiasis has a urine pH of 6.5, whereas the others have a urine pH < 5.5.
A persistently elevated urine pH (> 5.5) in the face of systemic acidosis indicates a failure of distal acidification, which is the mechanism of Type 1 RTA.
3
Assess the remaining two hypokalemic patients using additional diagnostic clues (urine anion gap and associated tubular defects).
The woman has a negative urine anion gap (indicating appropriate renal response to GI loss), while the man with myeloma has isolated glycosuria (indicating Fanconi syndrome / proximal tubule defect).
A negative urine anion gap confirms extrarenal bicarbonate loss. Generalized proximal tubule dysfunction (glycosuria, phosphaturia) confirms Type 2 RTA.

Key Concept

Differentiation of non-anion gap metabolic acidosis requires sequential evaluation of serum potassium, urine pH, and the urine anion gap to distinguish between gastrointestinal losses and the three main types of renal tubular acidosis.
Question 400Question →

Match each classic physical examination finding or auscultatory feature with the most likely associated pediatric congenital heart defect.

Click a left item, then click its matching right item

Items

Continuous 'machine-like' murmur heard best at the left infraclavicular area
Fixed, widely split S2 with a systolic ejection murmur at the left upper sternal border
Harsh holosystolic murmur heard best at the left lower sternal border
Upper extremity hypertension with weak, delayed, or absent femoral pulses

Matches

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Answer

The correct matches are: Continuous machine-like murmur with Patent ductus arteriosus; Fixed, widely split S2 with Atrial septal defect; Harsh holosystolic murmur with Ventricular septal defect; and Upper extremity hypertension with delayed femoral pulses with Coarctation of the aorta.
Each listed congenital heart defect produces distinct, classic hemodynamic changes that manifest as pathognomonic physical exam findings. PDA creates continuous aorta-to-pulmonary flow. ASD creates right heart volume overload leading to a fixed split S2. VSD causes high-velocity systolic flow between ventricles. Coarctation physically restricts distal aortic flow, leading to a pressure differential between the upper and lower extremities.

Step-by-Step Solution

1
Analyze each physical examination finding to determine the underlying hemodynamic abnormality.
Identified continuous flow (left 1), right heart volume overload (left 2), systolic interventricular flow (left 3), and distal aortic obstruction (left 4).
Connecting clinical signs to pathophysiology is essential for diagnosing congenital heart defects.
2
Match the hemodynamic abnormality to the corresponding anatomical defect.
Aorta-to-pulmonary artery connection matches PDA. Interatrial connection matches ASD. Interventricular connection matches VSD. Aortic narrowing matches Coarctation.
Each structural defect predictably produces specific, pathognomonic physical findings.

Key Concept

Classic clinical presentations of major acyanotic congenital heart defects
Estimated Time:45s
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