Following a physical altercation outside a local venue, a previously healthy adult male is… — USMLE Step 2 CK

Following a physical altercation outside a local venue, a previously healthy adult male is rushed to the trauma bay by bystanders. He has sustained a single penetrating injury to the left parasternal region at the level of the fourth intercostal space. Upon arrival, the patient is restless, diaphoretic, and visibly confused. Vital signs demonstrate a blood pressure of $72/45 \text{ mm Hg}$ , a heart rate of $134/\text{min}$ , and a respiratory rate of $22/\text{min}$ . Oxygen saturation is $94\%$ on ambient air. Physical examination is notable for prominent engorgement of the jugular veins. Pulmonary auscultation reveals clear breath sounds bilaterally. The cardiac point of maximal impulse is impalpable, and heart sounds are markedly muffled. His distal extremities are cool with delayed capillary refill. Which of the following is the most appropriate next step in the management of this patient?

Perform a focused assessment with sonography for trauma and prepare for operative interventionAnswer
B
Transport the patient to the radiology suite for an emergent computed tomography scan of the chest
C
Administer intravenous furosemide to manage presumed right ventricular volume overload
D
Admit the patient to the intensive care unit for continuous hemodynamic monitoring and observation
E
Initiate empiric broad-spectrum intravenous antibiotics and tetanus prophylaxis as primary therapy

Answer

Perform a focused assessment with sonography for trauma and prepare for operative intervention

The patient's clinical presentation of hypotension, tachycardia, jugular venous distention, and muffled heart sounds following a penetrating injury to the 'cardiac box' (the area bounded by the clavicles, xiphoid process, and midclavicular lines) is highly indicative of cardiac tamponade. Cardiac tamponade causes obstructive shock by restricting ventricular filling, leading to decreased cardiac output and poor peripheral perfusion. In a hemodynamically unstable patient with suspected cardiac tamponade, the most appropriate next step is to perform a bedside ultrasound to quickly confirm the presence of pericardial fluid. Once confirmed, immediate surgical intervention is required to relieve the tamponade and repair the underlying cardiac injury.

Step-by-Step Solution

Identify the critical clinical syndrome based on the physical examination and vital signs.

The patient has Beck's triad (hypotension, jugular venous distention, muffled heart sounds) after a penetrating chest injury.

Recognizing this triad is essential to diagnose cardiac tamponade and obstructive shock.

Determine the hemodynamic stability of the patient.

The patient is hemodynamically unstable, evidenced by a blood pressure of

72/45 \text{ mm Hg}

and signs of poor end-organ perfusion (confusion, cool extremities).

Stability dictates the urgency and choice of the next diagnostic or therapeutic maneuver.

Select the appropriate next step in management for an unstable patient with suspected tamponade.

Bedside ultrasonography (FAST exam) should be performed immediately, followed by emergent surgical repair (e.g., thoracotomy or sternotomy).

Unstable patients cannot be safely transported for advanced imaging (like CT) and require immediate bedside diagnosis and life-saving operative intervention.

Key Concept

Hemodynamically unstable patients with penetrating trauma to the 'cardiac box' and signs of cardiac tamponade (Beck's triad) require immediate bedside ultrasonography and emergent surgical intervention.

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