Examkin

Question

Difficulty: MediumCardiovascular System

An emergency medical services team brings a 2828-year-old male to the trauma bay following a high-speed motor vehicle collision. The patient was the unrestrained driver and struck his chest forcefully against the steering wheel. He is diaphoretic, agitated, and confused. Upon arrival, his temperature is 36.8∘C36.8^\circ\text{C} (98.2∘F98.2^\circ\text{F}), blood pressure is 75/40 mm Hg75/40\text{ mm Hg}, pulse is 135/min135/\text{min}, and respiratory rate is 26/min26/\text{min}. Pulse oximetry indicates an oxygen saturation of 94%94\% on a non-rebreather mask. Physical examination reveals pronounced engorgement of the jugular veins and a noticeable contusion over the central sternum. Lung fields are clear to auscultation bilaterally. Cardiac auscultation reveals distant, muffled heart sounds. An arterial blood gas analysis demonstrates a pH of 7.287.28, PaCO 2_2 of 32 mm Hg32\text{ mm Hg}, and HCO 3−_3^- of 15 mEq/L15\text{ mEq/L}, with an elevated serum lactate level. Which of the following is the most appropriate next step in the management of this patient?

  1. Immediate bedside echocardiographyAnswer
  2. B
    Transfer to the radiology suite for a computed tomography scan of the chest
  3. C
    Intravenous administration of sodium bicarbonate
  4. D
    Inhaled albuterol and intravenous corticosteroids
  5. E
    Intravenous piperacillin-tazobactam and vancomycin

Answer

Immediate bedside echocardiography
The correct management for this patient is immediate bedside echocardiography. The patient is presenting with classic signs of acute cardiac tamponade following blunt chest trauma, characterized by Beck's triad: hypotension, jugular venous distention, and distant or muffled heart sounds. The accumulation of blood in the pericardial space severely restricts right heart filling, leading to decreased cardiac output and obstructive shock. Because the patient is hemodynamically unstable, diagnosis must be confirmed rapidly at the bedside. Echocardiography (or a Focused Assessment with Sonography for Trauma - FAST) can immediately identify the pericardial effusion and diastolic collapse of the right ventricle, prompting urgent therapeutic pericardiocentesis or surgical exploration.

Step-by-Step Solution

1
Analyze the patient's history and presenting vital signs.
The patient has experienced high-speed blunt chest trauma and presents in a state of shock (hypotension, marked tachycardia).
Establishing the mechanism of injury and hemodynamic status prioritizes the differential diagnosis of shock in a trauma setting.
2
Evaluate the physical examination findings.
The patient exhibits Beck's triad: hypotension, elevated jugular venous pressure (engorged jugular veins), and muffled heart sounds.
These classic signs point directly to cardiac tamponade, causing obstructive shock.
3
Determine the most appropriate initial management step.
Bedside echocardiography (often performed as part of the FAST exam).
In an unstable patient, bedside imaging rapidly confirms the presence of pericardial fluid and right ventricular collapse without requiring transport, enabling immediate life-saving pericardiocentesis or thoracotomy.

Key Concept

Diagnosis and management of acute cardiac tamponade in blunt trauma
Rate this question

Topics

Cardiovascular System

More questions from this topic