Examkin

Question

Difficulty: Very hardInitial Stabilization and Triage

Emergency medical services bring a 64-year-old man to the emergency department after he collapsed at his workplace. Prior to losing consciousness, he complained of an agonizing, tearing pain radiating to his interscapular region. Upon arrival, he is lethargic and pale. Vital signs are temperature 36.8°C (98.2°F), blood pressure 75/40 mmHg in the right arm and 60/35 mmHg in the left arm, heart rate 132/min, and respiratory rate 26/min. Oxygen saturation is 96% on room air. Physical examination reveals prominently distended neck veins. The lungs are clear to auscultation bilaterally. Cardiac auscultation reveals distant heart sounds and a high-pitched, decrescendo diastolic murmur heard most loudly at the right upper sternal border. Radial pulses are markedly weaker on the left compared to the right. A point-of-care ultrasound of the heart demonstrates a large pericardial effusion with right ventricular collapse during diastole. Which of the following is the most appropriate immediate next step in the management of this patient?

  1. A
    Emergent bedside pericardiocentesis
  2. B
    Administration of intravenous labetalol
  3. C
    Computed tomography angiography of the chest
  4. Immediate cardiothoracic surgery consultation and cautious intravenous fluid administrationAnswer
  5. E
    Admission to the intensive care unit for continuous hemodynamic monitoring

Answer

Immediate cardiothoracic surgery consultation and cautious intravenous fluid administration
This patient presents with classic signs of an acute Type A aortic dissection (tearing back pain, blood pressure differential, new aortic regurgitation murmur) complicated by cardiac tamponade (hypotension, elevated jugular venous pressure, muffled heart sounds, and right ventricular diastolic collapse on ultrasound). The combination of these two life-threatening conditions creates a complex stabilization scenario. While cardiac tamponade is typically managed with emergent pericardiocentesis, doing so in the setting of an aortic dissection is contraindicated. Relieving the pericardial pressure removes the tamponading effect that is partially containing the aortic rupture, often leading to a sudden, fatal exsanguination. The most appropriate immediate step is to obtain an emergent cardiothoracic surgery consultation for definitive operative repair. Concurrently, cautious intravenous fluid administration is indicated to augment right-sided filling pressures and maintain cardiac output while preparing for the operating room.

Step-by-Step Solution

1
Analyze the clinical presentation and physical examination findings.
The patient has tearing back pain, a pulse differential, and a new diastolic murmur, strongly indicating an acute Type A aortic dissection.
Identifying the primary etiology is essential before interpreting the secondary complications.
2
Evaluate the hemodynamic instability and point-of-care ultrasound findings.
Hypotension, elevated jugular venous pressure, muffled heart sounds, and right ventricular diastolic collapse confirm cardiac tamponade.
Cardiac tamponade is a known, life-threatening complication of retrograde aortic dissection into the pericardial space.
3
Determine the appropriate initial stabilization strategy for dissection-related tamponade.
Pericardiocentesis is contraindicated due to the risk of exsanguination; the patient must go to the operating room immediately.
Relieving the pericardial pressure removes the tamponading effect that is temporarily limiting the aortic bleeding.
4
Select the most appropriate next step from the given options.
Immediate cardiothoracic surgery consultation and cautious intravenous fluid administration is the correct choice.
Fluids help maintain right-sided filling pressures against the tamponade while awaiting emergent definitive surgical repair.

Key Concept

Management of cardiac tamponade complicating acute Type A aortic dissection
Rate this question

Topics

Initial Stabilization and Triage

More questions from this topic