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Difficulty: MediumDiagnostic Workup and Test Sequencing

Match each acute clinical presentation with the most appropriate and urgent next diagnostic step.

  • A 62-year-old man with a history of hypertension presenting with sudden-onset "tearing" chest pain radiating to the back and asymmetric arm blood pressures.Computed tomography angiography (CTA) of the chest
  • A 24-year-old woman presenting with severe right lower quadrant abdominal pain, nausea, and a positive urine pregnancy test.Transvaginal ultrasonography
  • A 55-year-old man with known cirrhosis presenting with new-onset fever, diffuse abdominal pain, worsening ascites, and mild encephalopathy.Diagnostic paracentesis
  • A 68-year-old woman presenting to the emergency department with acute right-sided hemiparesis and global aphasia that began 45 minutes ago.Non-contrast computed tomography (CT) of the head
  • A 35-year-old intravenous drug user with fever, a new holosystolic cardiac murmur, and suspected infective endocarditis who has not yet received any antimicrobial treatment.Multiple sets of peripheral blood cultures

Answer

1 matches with CTA of the chest; 2 matches with Transvaginal ultrasonography; 3 matches with Diagnostic paracentesis; 4 matches with Non-contrast CT of the head; 5 matches with Multiple sets of peripheral blood cultures.
Each clinical presentation is matched with its most critical initial diagnostic step based on standardized medical guidelines, focusing on rapid stabilization, avoidance of harm, and accurate diagnosis.

Step-by-Step Solution

1
Evaluate the 62-year-old man for acute aortic dissection based on his tearing chest pain and asymmetric blood pressures.
Computed tomography angiography (CTA) of the chest is selected.
CTA provides rapid, definitive imaging to identify the intimal flap and classify the dissection.
2
Assess the 24-year-old pregnant woman with right lower quadrant pain.
Transvaginal ultrasonography is selected.
It is the safest imaging modality to visualize an ectopic pregnancy while avoiding radiation exposure to the fetus.
3
Analyze the 55-year-old man with cirrhosis, fever, and worsening ascites for spontaneous bacterial peritonitis (SBP).
Diagnostic paracentesis is selected.
Ascitic fluid analysis is necessary to confirm SBP (absolute neutrophil count > 250/mm³) before initiating antibiotics.
4
Review the presentation of the 68-year-old woman with acute stroke symptoms onset 45 minutes ago.
Non-contrast CT of the head is selected.
A non-contrast CT rapidly rules out intracranial hemorrhage, which is required before any thrombolytic therapy can be considered.
5
Examine the case of the 35-year-old intravenous drug user with signs of infective endocarditis.
Multiple sets of peripheral blood cultures are selected.
Cultures must be drawn prior to starting empiric antibiotics to ensure accurate pathogen identification and susceptibility testing.

Key Concept

Appropriate test sequencing in acute clinical scenarios requires prioritizing tests that rapidly identify life-threatening conditions (e.g., non-contrast CT for stroke, CTA for aortic dissection) or tests that must precede therapeutic interventions (e.g., blood cultures before antibiotics).
Estimated Time:2m 0s
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Diagnostic Workup and Test Sequencing

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