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Difficulty: HardSurgical and Procedural Interventions

A 68-year-old man is evaluated in the intensive care unit for sudden-onset shortness of breath and right-sided pleuritic chest pain. Three days ago, he underwent a left frontotemporal craniotomy for resection of a glioblastoma. His temperature is 37.1°C (98.8°F), blood pressure is 118/76 mm Hg, pulse is 112/min, and respirations are 24/min. Pulse oximetry shows 91% on room air. Physical examination reveals a well-healing cranial incision. The lungs are clear to auscultation bilaterally. Laboratory studies show a troponin I level of 0.8 ng/mL (normal: <0.04<0.04 ng/mL). A computed tomography pulmonary angiogram demonstrates a large filling defect in the right main pulmonary artery with associated right ventricular enlargement. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Initiation of a continuous intravenous heparin infusion
  2. B
    Catheter-directed thrombolysis
  3. Placement of an inferior vena cava filterAnswer
  4. D
    Surgical pulmonary embolectomy
  5. E
    Transthoracic echocardiography

Answer

Placement of an inferior vena cava filter is the most appropriate next step for this patient, as it prevents further embolization in the setting of an absolute contraindication to therapeutic anticoagulation.
The correct answer is placement of an inferior vena cava (IVC) filter. This patient has an acute submassive pulmonary embolism (PE), as indicated by the computed tomography (CT) findings, right ventricular enlargement, and elevated troponin level. The standard first-line treatment for a submassive PE is therapeutic anticoagulation (e.g., intravenous heparin). However, this patient underwent a craniotomy 3 days ago. Recent intracranial surgery (typically within the past 2 to 3 weeks) is an absolute contraindication to therapeutic anticoagulation due to the prohibitive risk of fatal intracranial hemorrhage. When a patient has an acute venous thromboembolism and an absolute contraindication to anticoagulation, a surgical or procedural intervention is required to prevent further embolization. Placement of an IVC filter traps large emboli originating from the deep veins of the lower extremities and pelvis, effectively preventing them from reaching the pulmonary circulation while the patient recovers from surgery.

Step-by-Step Solution

1
Identify the primary diagnosis and establish the risk stratification.
The patient has an acute submassive (intermediate-risk) pulmonary embolism, evidenced by the filling defect on CT angiography, right ventricular enlargement, and an elevated troponin level.
Risk stratification dictates whether the patient requires standard anticoagulation, advanced therapies like thrombolysis, or surgical interventions.
2
Evaluate the patient's medical history for contraindications to standard pharmacologic therapy.
The patient underwent a craniotomy 3 days ago. This is an absolute contraindication to both therapeutic anticoagulation (e.g., heparin) and thrombolysis.
Administering standard-of-care anticoagulants in the immediate postoperative period of a neurosurgical procedure carries a prohibitive risk of fatal intracranial hemorrhage.
3
Determine the most appropriate alternative procedural intervention.
Placement of an inferior vena cava (IVC) filter is required.
When anticoagulation is absolutely contraindicated, an IVC filter must be placed to mechanically trap deep vein thrombi from the lower extremities before they can reach the pulmonary circulation.

Key Concept

In patients with acute venous thromboembolism who have an absolute contraindication to therapeutic anticoagulation (such as recent intracranial surgery), the placement of an inferior vena cava filter is the most appropriate next step in management.
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Topics

Surgical and Procedural Interventions

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