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Zorluk: ZorDiagnostic Workup and Test Sequencing

A 31-year-old woman, G1P0 at 28 weeks gestation, is brought to the emergency department reporting sudden-onset shortness of breath and right-sided pleuritic chest pain that began two hours ago. She has no significant past medical history. Vital signs are temperature 37.1°C (98.8°F), blood pressure 118/76 mmHg, pulse 112/min, and respirations 22/min. Oxygen saturation is 94% on room air. Physical examination reveals clear lung fields bilaterally and a normal cardiac examination. Her right calf is mildly swollen and tender compared to the left. The physician suspects a pulmonary embolism. Which of the following investigations should be ordered concurrently as the most appropriate initial diagnostic steps? (Select exactly 2 options)

  1. Compression ultrasonography of the lower extremitiesCevap
  2. Chest radiographCevap
  3. C
    Computed tomography pulmonary angiography
  4. D
    Measurement of plasma D-dimer
  5. E
    Ventilation-perfusion scan

Cevap

The correct initial tests are compression ultrasonography of the lower extremities and a chest radiograph.
In a pregnant patient with suspected pulmonary embolism and symptoms of deep vein thrombosis, the diagnostic workup must balance clinical urgency with radiation stewardship. The most appropriate initial concurrent steps are bilateral compression ultrasonography of the lower extremities and a chest radiograph. Ultrasonography is completely non-invasive; if it proves positive for deep vein thrombosis, therapeutic anticoagulation is indicated, which is identical to the treatment for pulmonary embolism, thus averting the need for radiation-based imaging entirely. Concurrently, a chest radiograph is essential because it involves negligible fetal radiation, evaluates for alternative respiratory diagnoses, and crucially dictates the subsequent imaging pathway—a ventilation-perfusion scan is preferred if the radiograph is normal, whereas computed tomography pulmonary angiography is required if the radiograph is abnormal and the ultrasound was negative.

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1
Evaluate the patient's clinical presentation and hemodynamic status.
The patient is a stable pregnant woman presenting with classic signs of pulmonary embolism as well as concurrent deep vein thrombosis symptoms (calf swelling and tenderness).
Pregnancy alters the standard diagnostic algorithm for pulmonary embolism to minimize unnecessary radiation exposure to both the fetus and maternal breast tissue.
2
Select the first-line imaging modality for suspected deep vein thrombosis in pregnancy.
Compression ultrasonography of the lower extremities is selected.
It is non-invasive and lacks radiation. If it confirms deep vein thrombosis, therapeutic anticoagulation is initiated, and further potentially harmful thoracic imaging to confirm pulmonary embolism can be avoided entirely.
3
Determine the necessary concurrent initial thoracic imaging.
A chest radiograph is ordered simultaneously.
It delivers negligible fetal radiation, rapidly rules out alternative causes of acute dyspnea (e.g., pneumonia, pneumothorax), and dictates the required next step in imaging (ventilation-perfusion scan if normal, or computed tomography pulmonary angiography if abnormal) should the ultrasound return negative.

Anahtar Kavram

Diagnostic sequencing for suspected pulmonary embolism in pregnant patients involves concurrent lower extremity ultrasonography and chest radiography to minimize unnecessary radiation.
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Diagnostic Workup and Test Sequencing

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