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Difficulty: Very hardCardiovascular System

While rounding in the surgical intensive care unit, a physician is called to the bedside of a 7272-year-old male who has developed abrupt respiratory distress and confusion. The patient underwent an open right hemicolectomy for colon adenocarcinoma three days prior. Until this morning, his recovery was unremarkable. Current vital signs include a temperature of 38.1∘C38.1^\circ\text{C} (100.6∘F100.6^\circ\text{F}), heart rate of 134/min, respiratory rate of 28/min, and blood pressure of 82/48 mmHg. Pulse oximetry reveals an oxygen saturation of 85% on room air.

Physical examination shows profound diaphoresis and jugular venous distention visible up to the angle of the mandible while sitting at a 45-degree angle. The surgical incision appears clean and intact with no surrounding erythema. Pulmonary ausculation yields clear breath sounds bilaterally without wheezes or crackles. Cardiac auscultation reveals a loud pulmonic component of the second heart sound (P2) and an S3 gallop best heard at the lower left sternal border.

A 12-lead electrocardiogram displays sinus tachycardia with new T-wave inversions in leads V1 through V4 and a rightward shift of the QRS axis. Which of the following is the most appropriate next step in the management of this patient?

  1. Bedside transthoracic echocardiographyAnswer
  2. B
    Computed tomography angiography of the chest
  3. C
    Intravenous administration of alteplase
  4. D
    Sputum culture and intravenous piperacillin-tazobactam
  5. E
    Nasogastric tube insertion and upright abdominal radiography

Answer

Bedside transthoracic echocardiography
The correct answer is bedside transthoracic echocardiography. This patient is presenting with obstructive shock due to a suspected massive pulmonary embolism (hypotension, hypoxia, JVD, right-sided S3, and acute RV strain on ECG). Because he is hemodynamically unstable, transporting him to the CT scanner is contraindicated. Furthermore, because he had an open abdominal surgery just 3 days prior, systemic thrombolytics (such as alteplase) are absolutely contraindicated. A bedside echocardiogram will rapidly confirm right ventricular dysfunction (e.g., McConnell's sign, D-shaped left ventricle) without moving the patient, providing the necessary diagnostic evidence to proceed directly to surgical pulmonary embolectomy or catheter-directed mechanical thrombectomy.

Step-by-Step Solution

1
Analyze the clinical presentation and vital signs.
The patient has abrupt hypoxia, tachycardia, hypotension (82/48 mmHg), clear lungs, and right-sided heart failure signs (JVD, right-sided S3).
This constellation of findings strongly suggests acute right ventricular failure secondary to a massive pulmonary embolism (obstructive shock).
2
Assess the patient's hemodynamic stability.
The patient is in cardiogenic/obstructive shock with altered mental status.
Hemodynamic instability precludes safely transporting the patient out of the ICU for cross-sectional imaging (CT angiography).
3
Identify absolute contraindications in the patient's history.
The patient had an open right hemicolectomy three days ago.
Recent major surgery is an absolute contraindication to systemic thrombolytic therapy (alteplase).
4
Determine the optimal diagnostic and management pathway.
Perform a bedside transthoracic echocardiogram.
It rapidly confirms right ventricular dysfunction (e.g., McConnell's sign) at the bedside, justifying alternative definitive treatments like mechanical thrombectomy or surgical embolectomy without risking transport or fatal hemorrhage.

Key Concept

In hemodynamically unstable patients with suspected massive pulmonary embolism and absolute contraindications to thrombolysis, bedside echocardiography is the most appropriate next step to justify catheter-directed or surgical embolectomy.
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Topics

Cardiovascular System

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