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Zorluk: ZorDiagnostic Workup and Test Sequencing

An obstetric patient at 26 weeks gestation presents to the emergency triage area with abrupt-onset right-sided pleuritic chest discomfort and dyspnea. She has no significant past medical history and takes only prenatal vitamins. Vital signs reveal a temperature of 37.1°C (98.8°F), heart rate of 118/min, respiratory rate of 26/min, blood pressure of 112/70 mmHg, and oxygen saturation of 94% on ambient air. Physical examination is notable for an asymmetrically swollen and tender left calf with palpable cord-like induration. Auscultation of the lungs is clear bilaterally, and cardiovascular examination reveals sinus tachycardia without murmurs. Which of the following represent the most appropriate concurrent initial diagnostic studies for this patient? (Select exactly 2 answers)

  1. Compression ultrasonography of the proximal venous system of the lower extremitiesCevap
  2. Plain chest radiography with appropriate pelvic shieldingCevap
  3. C
    Plasma quantitative D-dimer assay
  4. D
    Computed tomography pulmonary angiography (CTPA)
  5. E
    Ventilation-perfusion (V/Q) scintigraphy

Cevap

The most appropriate concurrent initial steps are compression ultrasonography of the lower extremities and a plain chest radiograph with shielding.
In pregnant patients with suspected pulmonary embolism (PE), especially those with concurrent signs of deep vein thrombosis (DVT), the diagnostic algorithm prioritizes fetal safety. Bilateral lower extremity compression ultrasonography is the preferred initial test because confirming a DVT provides sufficient grounds for full therapeutic anticoagulation, thereby bypassing the need for maternal and fetal radiation exposure. Concurrently, a chest radiograph (with proper abdominal/pelvic shielding) is indicated as a fundamental initial step to evaluate for other causes of chest pain and dyspnea. If the ultrasound is negative, the results of the chest radiograph dictate the next sequencing step: a normal radiograph prompts a V/Q scan, whereas an abnormal radiograph prompts computed tomography pulmonary angiography (CTPA).

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1
Analyze the clinical presentation and vital signs.
The patient is a pregnant female presenting with classic signs of pulmonary embolism (pleuritic chest pain, dyspnea, tachycardia, hypoxia) alongside clinical evidence of a deep vein thrombosis (swollen, tender calf).
Identifying the dual presentation of deep vein thrombosis and pulmonary embolism is crucial for determining the safest diagnostic pathway.
2
Determine the safest imaging modality to confirm venous thromboembolism in pregnancy.
Compression ultrasonography of the legs is selected as the primary initial imaging modality.
If ultrasonography confirms a deep vein thrombosis, full therapeutic anticoagulation is indicated, bypassing the need for potentially harmful advanced pulmonary imaging (CTPA or V/Q scan) that involves ionizing radiation.
3
Select the appropriate concurrent baseline evaluation for the chest symptoms.
A chest radiograph with shielding is selected.
A chest radiograph rapidly evaluates for alternative causes of symptoms (such as pneumonia) with negligible fetal radiation. Furthermore, if the leg ultrasound is negative, the radiograph results will dictate the next step (V/Q scan if normal, CTPA if abnormal).

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Diagnostic algorithm and test sequencing for suspected pulmonary embolism in pregnancy.
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Diagnostic Workup and Test Sequencing

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