A 27-year-old man is brought to the emergency department via ambulance after a high-speed … — USMLE Step 2 CK

A 27-year-old man is brought to the emergency department via ambulance after a high-speed motorcycle collision. He was found approximately $6 \text{ meters}$ ( $20 \text{ feet}$ ) from his motorcycle without a helmet. Upon arrival, the patient is unresponsive. His temperature is $36.2^\circ \text{C}$ ( $97.2^\circ \text{F}$ ), blood pressure is $72/40 \text{ mmHg}$ , heart rate is $145\text{/min}$ , and respiratory rate is $28\text{/min}$ with shallow breaths. Oxygen saturation is $92\%$ on high-flow oxygen. The patient is immediately intubated for airway protection. Physical examination reveals a large, actively bleeding scalp laceration over the right parietal area. Neurological evaluation demonstrates a Glasgow Coma Scale score of 3T. The right pupil is $8\text{ mm}$ and nonreactive to light; the left pupil is $3\text{ mm}$ and reactive. The abdomen is grossly distended and rigid. A focused assessment with sonography for trauma (FAST) exam reveals a large amount of anechoic fluid in the hepatorenal and splenorenal recesses. Arterial blood gas analysis on $100\%$ FiO2 reveals:

pH: $7.15$
PaCO2: $38\text{ mmHg}$
PaO2: $210\text{ mmHg}$
HCO3: $12\text{ mEq/L}$

What is the most appropriate next step in management?

Exploratory laparotomyAnswer
B
Immediate non-contrast CT scan of the head
C
Continued fluid resuscitation and observation in the trauma bay
D
Administration of intravenous broad-spectrum antibiotics
E
Administration of intravenous sodium bicarbonate

Answer

Exploratory laparotomy

This patient presents with a classic 'competing emergencies' scenario: profound hemorrhagic shock from intra-abdominal trauma and impending uncal herniation (unilaterally dilated pupil, GCS 3T) from a severe traumatic brain injury. According to Advanced Trauma Life Support (ATLS) protocols, restoring systemic hemodynamics (Circulation) takes absolute precedence over defining the intracranial injury (Disability). Prolonged hypotension drastically worsens secondary brain injury by decreasing cerebral perfusion pressure, and the patient will succumb to hemorrhagic shock rapidly if untreated. Therefore, the patient must be taken immediately to the operating room for an exploratory laparotomy to control the intra-abdominal hemorrhage. While neurosurgical evaluation and empirical medical management for elevated intracranial pressure (e.g., hypertonic saline, head elevation) should be initiated simultaneously, transferring a hemodynamically unstable patient to the CT scanner is strictly contraindicated.

Step-by-Step Solution

Analyze the patient's vital signs and FAST exam results.

The patient is in class IV hemorrhagic shock (BP

72/40 \text{ mmHg}

, HR

145\text{/min}

) with massive intra-abdominal bleeding confirmed by a positive FAST exam.

Identifying the source of hemodynamic instability is the first priority in trauma (Circulation).

Evaluate the neurological findings.

The patient has a GCS of 3T with a unilaterally dilated, unresponsive right pupil (

8\text{ mm}

), strongly indicating severe traumatic brain injury (TBI) and uncal herniation.

Neurological status (Disability) dictates the need for urgent neurosurgical evaluation and management.

Synthesize competing emergencies using Advanced Trauma Life Support (ATLS) algorithms.

Circulation (C) takes precedence over Disability (D). The patient must undergo exploratory laparotomy immediately.

Hypotension exacerbates secondary brain injury and will cause death before the herniation does. Neuroimaging must be delayed until the patient is hemodynamically stabilized.

Key Concept

In patients with severe traumatic brain injury and competing hemorrhagic shock, surgical hemostasis (Circulation) must precede neuroimaging (Disability) to prevent lethal secondary brain injury from prolonged hypotension.

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