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Difficulty: HardDiagnostic Workup and Test Sequencing

Evaluate the following clinical scenarios of patients with suspected pulmonary embolism. What is the most appropriate next step in the diagnostic workup for each patient? Match each clinical presentation to its guideline-indicated diagnostic test.

  • A 28-year-old woman is evaluated for sudden pleuritic chest pain; she is hemodynamically stable, her Wells score is 6.5 (high probability), and she has normal renal function.Computed tomography (CT) pulmonary angiography
  • A 55-year-old man is assessed in the resuscitation bay for acute severe dyspnea; his blood pressure is 75/45 mm Hg, heart rate is 125/min, and he is deemed too unstable for safe transport.Bedside transthoracic echocardiography
  • A 40-year-old woman is seen for atypical chest pain; her Wells score is 1.0 (low probability), heart rate is 88/min, oxygen saturation is 98%, and she has no history of exogenous estrogen use, prior thromboembolism, or recent surgery.No further diagnostic testing for pulmonary embolism
  • A 71-year-old man is evaluated for acute dyspnea and tachycardia; his Wells score is 5.0 (moderate probability); laboratory results show an estimated glomerular filtration rate (eGFR) of 22 mL/min/1.73 m2, and his chest radiograph is clear.Ventilation-perfusion (V/Q) scan

Answer

The correct pairings match each clinical vignette to its guideline-directed diagnostic step based on hemodynamic status, pre-test probability, and contraindications.
The correct pairings strictly align with established clinical guidelines for the diagnostic algorithm of pulmonary embolism, successfully balancing pre-test probability, hemodynamic stability, and patient-specific contraindications to medical imaging.

Step-by-Step Solution

1
Assess hemodynamic stability.
The 55-year-old man is unstable (blood pressure 75/45 mm Hg).
Hemodynamic instability dictates immediate bedside evaluation over transport for definitive imaging.
2
Calculate pre-test probability for the hemodynamically stable patients.
The 28-year-old woman has high probability (Wells 6.5); the 40-year-old woman has low probability (Wells 1.0); the 71-year-old man has moderate probability (Wells 5.0).
Pre-test probability determines if advanced imaging, D-dimer testing, or clinical rule-out is appropriate.
3
Apply rule-out criteria for the low probability patient.
The 40-year-old woman meets all Pulmonary Embolism Rule-Out Criteria (PERC), ruling out pulmonary embolism without further testing.
PERC is designed to safely prevent over-testing in low-risk populations.
4
Evaluate for contraindications to CT pulmonary angiography in moderate or high probability patients.
The 71-year-old man has severe chronic kidney disease (eGFR 22), precluding intravenous contrast. The 28-year-old woman has no contraindications.
Patient-specific factors like renal failure or severe contrast allergy necessitate alternative imaging such as a V/Q scan.

Key Concept

Diagnostic algorithm and test sequencing for suspected pulmonary embolism.
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Topics

Diagnostic Workup and Test Sequencing

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