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Difficulty: MediumSurgical and Procedural Interventions

A 28-year-old man is brought to the emergency department by emergency medical services 15 minutes after sustaining a stab wound to the left chest during an altercation. The wound is located at the left 5th intercostal space, just medial to the midclavicular line. On arrival, he is lethargic but responsive to painful stimuli. His temperature is 36.8°C (98.2°F), blood pressure is 76/40 mmHg, pulse is 132/min, and respirations are 26/min. Physical examination reveals distended jugular veins. The trachea is midline, and breath sounds are clear and equal bilaterally. Heart sounds are muffled. Which of the following procedural and management interventions are immediately indicated for this patient? (Select all that apply)

  1. Performance of a bedside focused assessment with sonography in trauma (FAST) examinationAnswer
  2. Immediate transfer to the operating room for surgical explorationAnswer
  3. C
    Endotracheal intubation with initiation of positive pressure ventilation
  4. D
    Computed tomography (CT) angiography of the chest
  5. E
    Placement of a left-sided tube thoracostomy

Answer

The indicated interventions are performing a bedside focused assessment with sonography in trauma (FAST) examination and immediately transferring the patient to the operating room for surgical exploration.
The correct interventions focus on rapid, non-invasive confirmation of the diagnosis and definitive surgical repair. A bedside FAST examination is the standard of care for rapidly identifying pericardial effusion in an unstable trauma patient. Once tamponade is confirmed in the setting of penetrating trauma, immediate surgical exploration (usually via sternotomy or thoracotomy) is mandatory to evacuate the blood and repair the myocardial defect.

Step-by-Step Solution

1
Analyze the patient's mechanism of injury and vital signs.
The patient has a penetrating injury in the 'cardiac box' and is hemodynamically unstable (hypotensive, tachycardic).
Identifying the severity of shock guides the urgency of interventions and rules out time-consuming diagnostic tests.
2
Correlate physical examination findings to formulate the primary diagnosis.
The presence of Beck's triad (hypotension, distended jugular veins, muffled heart sounds) alongside equal breath sounds and a midline trachea points to acute cardiac tamponade, not a tension pneumothorax.
Accurate clinical diagnosis differentiates between competing life-threatening thoracic emergencies.
3
Determine the appropriate diagnostic and therapeutic interventions.
A bedside FAST exam should be performed immediately to confirm pericardial fluid, followed by urgent transfer to the operating room for definitive surgical repair.
Unstable patients require interventions that can be performed at the bedside (FAST) and definitive anatomical correction (surgery).
4
Identify and avoid contraindicated actions.
Do not intubate with positive pressure before decompression, and do not send the patient to the CT scanner.
Positive pressure ventilation severely impairs right heart filling in tamponade, and CT imaging delays life-saving surgery in an unstable patient.

Key Concept

The immediate management of penetrating cardiac trauma with tamponade requires rapid bedside diagnosis via a FAST exam and definitive surgical exploration, while strictly avoiding interventions that decrease venous return (like positive pressure ventilation) or delay definitive care (like CT imaging).
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Topics

Surgical and Procedural Interventions

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