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Difficulty: MediumPulmonary and Critical Care

A 62-year-old woman is evaluated in the surgical intensive care unit for sudden-onset severe shortness of breath. She underwent an open abdominal hysterectomy 4 days ago. Her temperature is 37.6°C (99.7°F), blood pressure is 78/52 mm Hg, pulse is 128/min, and respirations are 32/min. Pulse oximetry shows 85% on room air. Physical examination reveals prominent jugular venous distention. The lungs are clear to auscultation bilaterally. Cardiac examination shows a regular, rapid rhythm with a loud pulmonic component of the second heart sound (P2P_2). An electrocardiogram shows sinus tachycardia with new T-wave inversions in leads V1 through V4. Arterial blood gas analysis on room air shows a pH of 7.22, a PaCO2PaCO_2 of 32 mm Hg, a PaO2PaO_2 of 54 mm Hg, and an HCO3−HCO_3^- of 13 mEq/L. Which of the following is the most appropriate next step in management?

  1. Bedside transthoracic echocardiographyAnswer
  2. B
    Computed tomography pulmonary angiography
  3. C
    Administration of intravenous furosemide
  4. D
    Administration of intravenous piperacillin-tazobactam
  5. E
    Administration of intravenous sodium bicarbonate

Answer

Bedside transthoracic echocardiography
The correct answer is bedside transthoracic echocardiography. This patient has a massive pulmonary embolism (PE) leading to obstructive shock, evidenced by sudden-onset dyspnea, severe hypotension, prominent jugular venous distention, clear lungs, and electrocardiographic evidence of acute right heart strain (T-wave inversions in leads V1-V4). In hemodynamically unstable patients with suspected PE, transporting the patient to the radiology suite for computed tomography (CT) pulmonary angiography is extremely dangerous due to the high risk of decompensation and cardiac arrest during transit. Therefore, the most appropriate next step is a bedside transthoracic echocardiogram. Demonstration of acute right ventricular dysfunction (e.g., right ventricular dilation, McConnell sign) provides sufficient evidence to justify definitive reperfusion therapy. Because this patient underwent major intra-abdominal surgery 4 days ago (an absolute contraindication to systemic thrombolysis), confirming the diagnosis at the bedside allows the critical care team to rapidly escalate to surgical embolectomy or catheter-directed therapy.

Step-by-Step Solution

1
Identify the primary clinical syndrome.
The patient presents with sudden-onset dyspnea, severe hypotension, clear lungs, jugular venous distention, and right heart strain on the electrocardiogram 4 days after major surgery.
Recognizing this classic presentation points directly to a massive pulmonary embolism causing obstructive shock and acute cor pulmonale.
2
Assess hemodynamic stability.
The patient is hemodynamically unstable, evidenced by a blood pressure of 78/52 mm Hg and signs of malperfusion (severe lactic acidosis on the blood gas).
A patient's hemodynamic status dictates the diagnostic and therapeutic algorithm for suspected pulmonary embolism.
3
Select the safest and most appropriate diagnostic modality.
Bedside transthoracic echocardiography is chosen over the standard computed tomography scan.
Transporting an unstable patient in obstructive shock poses an unacceptable risk of cardiac arrest. Bedside echocardiography rapidly identifies right ventricular dysfunction, justifying definitive reperfusion therapy.

Key Concept

In patients with suspected massive pulmonary embolism who are hemodynamically unstable, bedside transthoracic echocardiography is the most appropriate initial diagnostic step because transporting them for a definitive computed tomography scan is unsafe.
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Topics

Pulmonary and Critical Care

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