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Zorluk: KolayDiagnostic Workup and Test Sequencing

A 55-year-old man is evaluated in the emergency department for left leg pain and swelling that began 24 hours ago. He has a history of colon cancer and is currently undergoing active chemotherapy. His temperature is 37.1 C (98.8 F), blood pressure is 130/80 mm Hg, heart rate is 88/min, and respiratory rate is 14/min. Physical examination reveals a visibly swollen, tense, and erythematous left lower extremity. The left calf circumference is 5 cm larger than the right calf. There is no chest pain or shortness of breath. Which of the following is the most appropriate next step in the diagnostic workup for this patient?

  1. Compression ultrasonography of the lower extremityCevap
  2. B
    Serum D-dimer assay
  3. C
    Computed tomography venography of the lower extremities
  4. D
    Contrast venography
  5. E
    Measurement of prothrombin time and partial thromboplastin time

Cevap

Compression ultrasonography of the lower extremity
The correct approach for a patient with suspected deep vein thrombosis begins with risk stratification using the Wells criteria. This patient has multiple risk factors (active cancer, massive unilateral swelling, and calf asymmetry >3 cm), placing him in the high-probability category. For high-probability patients, the diagnostic algorithm dictates proceeding directly to non-invasive imaging with compression ultrasonography. D-dimer testing is skipped because a negative result would not be sufficient to rule out a thrombus in this high-risk scenario.

Adım Adım Çözüm

1
Assess the pretest probability of deep vein thrombosis using the Wells criteria.
The patient scores points for active cancer, unilateral entire leg swelling, and calf swelling greater than 3 cm, indicating a high pretest probability.
Diagnostic algorithms for deep vein thrombosis depend heavily on clinical risk stratification to determine the appropriate first test.
2
Determine the appropriate initial diagnostic test based on the high risk score.
Compression ultrasonography is selected as the initial test.
In high-probability patients, the risk of disease is significant enough that a D-dimer cannot safely rule it out; direct visualization via non-invasive imaging is required.

Anahtar Kavram

In patients with a high pretest probability of deep vein thrombosis, compression ultrasonography is the most appropriate initial diagnostic test, bypassing the D-dimer assay.
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Diagnostic Workup and Test Sequencing

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