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Difficulty: EasyPharmacologic Interventions

A 48-year-old man presents to the ambulatory care clinic with a 2-day history of right leg swelling and calf pain. He recently returned from a 12-hour international flight. His temperature is 37.1°C (98.8°F), blood pressure is 128/82 mmHg, pulse is 76/min, and respiratory rate is 14/min. Physical examination reveals pitting edema and tenderness in the right lower extremity below the knee. Point-of-care compression ultrasonography demonstrates a noncompressible right popliteal vein. Laboratory testing shows a serum creatinine of 0.9 mg/dL and normal liver function tests. The patient is hemodynamically stable, ambulatory, and has reliable access to outpatient follow-up. Which of the following is the most appropriate initial pharmacologic intervention for this patient?

  1. Oral apixabanAnswer
  2. B
    Oral warfarin
  3. C
    Oral aspirin
  4. D
    Intravenous unfractionated heparin
  5. E
    Intravenous alteplase

Answer

The most appropriate initial pharmacotherapy is oral apixaban.
The patient has an acute, uncomplicated deep vein thrombosis (DVT) and is completely stable for outpatient management. Direct oral anticoagulants (DOACs), particularly apixaban and rivaroxaban, are the preferred initial therapy. They are highly effective, carry a lower risk of major bleeding compared to vitamin K antagonists, and can be started immediately as monotherapy without the need for a parenteral bridge (like low-molecular-weight heparin) or routine laboratory monitoring.

Step-by-Step Solution

1
Diagnose the patient's acute condition based on clinical presentation and ultrasound findings.
The patient has an acute right-sided proximal deep vein thrombosis (DVT).
Unilateral leg swelling, recent prolonged immobilization, and a noncompressible popliteal vein confirm the diagnosis.
2
Assess the patient's clinical stability and risk factors to determine the appropriate disposition.
The patient is hemodynamically stable, has normal renal/hepatic function, and can be managed in the outpatient setting.
Identifying that the patient does not require hospital admission narrows the pharmacologic choices to outpatient-friendly regimens.
3
Select the guideline-concordant anticoagulant for outpatient monotherapy.
Oral apixaban is selected.
Direct oral anticoagulants (DOACs) such as apixaban and rivaroxaban are the preferred first-line agents because they do not require parenteral bridging or routine laboratory monitoring.

Key Concept

Outpatient management of uncomplicated deep vein thrombosis
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Topics

Pharmacologic Interventions

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