A 29-year-old male is brought to the trauma bay after a high-speed motorcycle collision. U… — USMLE Step 3

A 29-year-old male is brought to the trauma bay after a high-speed motorcycle collision. Upon arrival, his blood pressure is $78/40 \text{ mm Hg}$ , heart rate is $142/\text{min}$ , and respiratory rate is $28/\text{min}$ . Intravenous crystalloid and a massive transfusion protocol are initiated. A focused assessment with sonography for trauma (FAST) reveals a large amount of free intraperitoneal fluid. The patient is immediately transported to the operating room for an exploratory laparotomy, which reveals a massive Grade V liver laceration with brisk, ongoing hemorrhage. The anesthesia team reports that the patient's core temperature has dropped to $34.1^\circ\text{C}$ ( $93.4^\circ\text{F}$ ), and an arterial blood gas shows a pH of $7.12$ with a base deficit of $14 \text{ mEq/L}$ . Diffuse microvascular bleeding is noted from all surgical surfaces. Which of the following is the most appropriate next step in surgical management?

Perform perihepatic packing, apply a temporary abdominal closure device, and transfer to the intensive care unit.Answer
B
Proceed with a formal anatomic hepatic resection and perform primary fascial closure.
C
Pause the operation to administer prothrombin complex concentrate and observe for clot formation.
D
Apply a temporary abdominal closure and transport the patient to the radiology department for a contrast-enhanced computed tomography scan.
E
Pack the liver and transport the patient directly to the interventional radiology suite for hepatic artery embolization.

Answer

The most appropriate next step is to perform perihepatic packing, apply a temporary abdominal closure device, and transfer the patient to the intensive care unit.

This patient is exhibiting the 'lethal triad' of trauma: hypothermia (

34.1^\circ\text{C}

), severe metabolic acidosis (pH

7.12

, base deficit

14 \text{ mEq/L}

), and coagulopathy (diffuse microvascular bleeding). When a patient reaches this state of physiologic exhaustion, attempting prolonged, definitive surgical repair (such as a formal hepatic lobectomy) is universally fatal. The standard of care is 'damage control surgery', which consists of three phases. Phase 1 is a truncated operation to rapidly control hemorrhage and contamination, typically involving perihepatic packing and a temporary abdominal closure to prevent abdominal compartment syndrome. Phase 2 involves immediate transfer to the intensive care unit for aggressive physiological resuscitation, including active rewarming, correction of acid-base derangements, and targeted administration of blood products. Phase 3 is a planned return to the operating room for definitive repair and fascial closure once the patient's physiology has normalized.

Step-by-Step Solution

Analyze the patient's intraoperative physiologic parameters.

The patient has a core temperature of

34.1^\circ\text{C}

(hypothermia), a pH of

7.12

(acidosis), and diffuse microvascular bleeding (coagulopathy).

Identifying these three parameters confirms the presence of the 'lethal triad' of trauma.

Determine the surgical strategy for a patient in physiological extremis.

Definitive repair is contraindicated. The priority shifts from anatomic repair to physiological preservation.

Prolonged operative time exacerbates the lethal triad, leading to irreversible shock and death.

Select the appropriate procedural sequence for damage control surgery.

The correct sequence is rapid mechanical hemostasis (packing), prevention of abdominal compartment syndrome (temporary closure), and immediate ICU transfer.

This sequence allows the ICU team to restore physiologic stability (rewarming, blood products) before returning to the OR for definitive repair.

Key Concept

In hemodynamically unstable trauma patients exhibiting the lethal triad (hypothermia, acidosis, coagulopathy), damage control surgery (rapid packing, temporary closure, and ICU resuscitation) is indicated over definitive surgical repair.

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