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Difficulty: HardPulmonary and Critical Care

While rounding in the surgical recovery unit, a physician is urgently called to the bedside of a 5858-year-old male who just experienced a sudden cardiovascular collapse. The patient underwent an extensive small bowel resection for acute mesenteric ischemia 55 days prior. The nurse reports that the patient acutely developed severe breathlessness and profound diaphoresis while being repositioned in bed.

Vital signs are temperature 38.0∘C38.0^{\circ}\text{C} (100.4∘F100.4^{\circ}\text{F}), blood pressure 76/4076/40 mm Hg, heart rate 136136/min, and respirations 3434/min. Pulse oximetry displays 82%82\% on room air.

On physical examination, the patient is obtunded with cool, mottled extremities. There is marked jugular venous distension. Lung auscultation is clear bilaterally. Cardiac auscultation reveals a prominent parasternal heave, a loud P2, and a right-sided S3 gallop. The abdominal incision is intact with mild surrounding erythema but no fluctuance or purulent drainage.

Arterial blood gas reveals:
pH: 7.217.21
PaCO 2_2: 2929 mm Hg
PaO 2_2: 5252 mm Hg
HCO 3−_3^-: 1111 mEq/L

A portable bedside echocardiogram is immediately performed, demonstrating a severely enlarged right ventricle with free-wall hypokinesis and apical sparing, along with leftward bowing of the interventricular septum. Left ventricular systolic function is preserved.

Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Computed tomography pulmonary angiography
  2. Percutaneous catheter-directed embolectomyAnswer
  3. C
    Blood cultures and empiric intravenous broad-spectrum antibiotics
  4. D
    Intravenous furosemide and noninvasive positive pressure ventilation
  5. E
    Intravenous sodium bicarbonate infusion

Answer

Percutaneous catheter-directed embolectomy
The correct answer is percutaneous catheter-directed embolectomy. This patient is presenting with obstructive shock secondary to a massive pulmonary embolism (PE). This diagnosis is strongly supported by the sudden onset of severe dyspnea, hypotension, marked hypoxemia, clear lungs, jugular venous distention, and bedside echocardiographic findings of severe right ventricular dilation and McConnell's sign (right ventricular free-wall hypokinesis with apical sparing). Massive PE requires immediate reperfusion therapy to restore right ventricular output and systemic perfusion. While systemic thrombolysis (e.g., intravenous alteplase) is the standard first-line therapy for massive PE, this patient underwent major abdominal surgery 55 days ago. Recent major surgery (typically within the last 2−32-3 weeks) is an absolute contraindication to systemic thrombolytic therapy due to the unacceptably high risk of catastrophic hemorrhage. Therefore, the most appropriate alternative for definitive reperfusion is percutaneous catheter-directed embolectomy or surgical pulmonary embolectomy.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and vital signs.
The patient is in shock (blood pressure 76/4076/40 mm Hg, cool/mottled extremities, obtunded) and severely hypoxemic.
To determine the severity and primary category of the patient's acute deterioration.
2
Interpret the physical exam and bedside echocardiogram.
Clear lungs, jugular venous distention, right-sided S3, and McConnell's sign (right ventricular free-wall hypokinesis with apical sparing) indicate acute right ventricular failure.
To differentiate the etiology of the shock state (obstructive vs. distributive vs. cardiogenic).
3
Diagnose the underlying condition.
The combination of acute right heart strain and obstructive shock in a postoperative patient confirms a massive pulmonary embolism.
Massive PE is defined by hemodynamic instability and requires immediate reperfusion therapy.
4
Select the appropriate reperfusion strategy considering the patient's surgical history.
Systemic thrombolysis is generally indicated for massive PE but is absolutely contraindicated here due to major abdominal surgery 55 days ago. Catheter-directed embolectomy or surgical embolectomy is the next best step.
To relieve the pulmonary obstruction while minimizing the risk of fatal surgical site hemorrhage.

Key Concept

Management of massive pulmonary embolism in patients with absolute contraindications to systemic thrombolysis involves prompt percutaneous catheter-directed embolectomy or surgical pulmonary embolectomy.
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Topics

Pulmonary and Critical Care

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