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Difficulty: MediumNeurosurgery

A 38-year-old man is transported to the trauma center by helicopter emergency medical services following a high-speed motorcycle crash. He was intubated at the scene due to a Glasgow Coma Scale score of 66. Upon arrival, his blood pressure is 78/4078/40 mmHg, and his heart rate is 135135/min. Physical examination reveals a rigid, distended abdomen and a large boggy hematoma over the left temporal region. A Focused Assessment with Sonography for Trauma (FAST) examination reveals a large volume of free fluid in the hepatorenal recess and pelvis. While the trauma team is administering a transfusion of uncrossmatched type O-negative blood, the patient's left pupil becomes fixed and dilated at 88 mm, and he develops extensor posturing of the right upper and lower extremities in response to painful stimuli. Which of the following is the most appropriate next step in the management of this patient?

  1. Administer hypertonic saline intravenously and immediately transfer to the operating room for an exploratory laparotomyAnswer
  2. B
    Transport to the radiology suite for an emergent non-contrast CT scan of the head and abdomen
  3. C
    Administer mannitol intravenously and immediately transfer to the operating room for an exploratory laparotomy
  4. D
    Adjust the mechanical ventilator settings to forcefully reduce the PaCO2 to 18 mmHg
  5. E
    Transfer to the surgical intensive care unit for aggressive blood product resuscitation and intracranial pressure monitoring

Answer

Administer hypertonic saline intravenously and immediately transfer to the operating room for an exploratory laparotomy.
The correct action is to administer hypertonic saline intravenously and immediately transfer the patient to the operating room for an exploratory laparotomy. This patient presents with two simultaneous, life-threatening emergencies: uncal herniation (evidenced by the ipsilateral fixed/dilated pupil and contralateral decerebrate posturing) and class III/IV hemorrhagic shock from intra-abdominal bleeding (evidenced by hypotension, tachycardia, and a positive FAST exam). In a hemodynamically unstable patient, hypertonic saline is the preferred hyperosmolar agent for lowering intracranial pressure because it acts as an intravascular volume expander, unlike mannitol, which causes osmotic diuresis and worsens hypovolemia. Concurrently, the patient must be taken directly to the operating room for laparotomy to obtain definitive source control of the hemorrhage. The neurosurgical team can perform a concurrent decompression (e.g., burr hole or craniotomy) while the trauma surgeons arrest the abdominal bleeding.

Step-by-Step Solution

1
Identify the primary physiological derangements.
The patient is in severe hypovolemic shock (BP 78/4078/40 mmHg, positive FAST) and is simultaneously experiencing left uncal herniation (blown left pupil, right-sided extensor posturing).
Recognizing competing life-threatening emergencies dictates the prioritization of interventions.
2
Determine the optimal medical therapy for the impending brain herniation.
Hypertonic saline is selected over mannitol.
Mannitol induces osmotic diuresis, which would further deplete intravascular volume and worsen the patient's profound hemorrhagic shock. Hypertonic saline effectively draws fluid out of the cerebral parenchyma while simultaneously expanding intravascular volume.
3
Determine the next definitive intervention in the trauma pathway.
Immediate transfer to the operating room for an exploratory laparotomy.
A hemodynamically unstable patient with a positive FAST exam requires immediate surgical exploration to arrest active intra-abdominal bleeding. A concurrent neurosurgical procedure (such as a craniotomy) can be performed in the operating room once the patient is undergoing laparotomy.

Key Concept

Management of acute brain herniation in the setting of severe hemorrhagic shock.
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Topics

Neurosurgery

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