Examkin

Soru

Zorluk: OrtaNeurosurgery

A 7474-year-old woman is brought to the emergency department via ambulance after her daughter found her unresponsive at home. The daughter mentions that the patient slipped and struck the right side of her head against a doorframe two weeks prior, but did not seek medical care at the time. Her medical history includes paroxysmal atrial fibrillation, for which she is prescribed apixaban. On arrival, her blood pressure is 185/105185/105 mmHg, heart rate is 5252/min, and respiratory rate is 1010/min with an irregular pattern. Her Glasgow Coma Scale score is 66 (eye opening 11, verbal response 11, motor response 44). Neurological examination is notable for a right pupil that measures 77 mm and does not react to light, while the left pupil is 33 mm and briskly reactive. Painful stimuli elicit decerebrate posturing of the left upper and lower extremities. She is immediately intubated for airway protection. Which of the following is the most appropriate next step to acutely manage her neurological deterioration prior to surgical intervention?

  1. Intravenous hypertonic salineCevap
  2. B
    Lumbar puncture
  3. C
    Intravenous dexamethasone
  4. D
    Hyperventilation to a PaCO 2_2 of 2222 mmHg
  5. E
    Enteral nimodipine

Cevap

Intravenous hypertonic saline
The correct answer is intravenous hypertonic saline. This patient's presentation of hypertension, bradycardia, and irregular respirations (Cushing's triad), combined with an ipsilateral dilated pupil and contralateral decerebrate posturing, indicates impending uncal (transtentorial) herniation. Given her history of a fall while taking an anticoagulant, she most likely has an expanding subdural hematoma causing severe mass effect. While definitive treatment requires emergent neurosurgical decompression (e.g., burr holes or craniotomy), immediate temporizing measures must be employed to acutely lower the intracranial pressure (ICP). Osmotic therapy, utilizing either intravenous hypertonic saline or mannitol, creates an intravascular osmotic gradient that draws free water out of the brain parenchyma. This rapidly reduces cerebral edema and ICP, mitigating the herniation syndrome and preventing permanent brainstem damage while the operating room is prepared.

Adım Adım Çözüm

1
Identify the primary clinical syndrome from the vital signs and neurological exam.
The patient has Cushing's triad (hypertension, bradycardia, irregular respirations) and a blown right pupil with contralateral posturing.
These findings are classic for severely elevated intracranial pressure leading to ipsilateral uncal (transtentorial) herniation.
2
Determine the most likely underlying etiology based on the history.
Recent head trauma in an elderly patient on anticoagulation strongly points to an acute-on-chronic subdural hematoma.
Bridging veins are highly susceptible to tearing in elderly patients, and anticoagulation exacerbates the bleeding, leading to significant mass effect.
3
Select the appropriate temporizing medical intervention for acute brain herniation.
Osmotic therapy with intravenous hypertonic saline or mannitol is required.
Osmotic agents rapidly draw water out of the brain parenchyma into the vascular space, acutely lowering intracranial pressure and buying time for definitive surgical decompression.

Anahtar Kavram

Acute management of elevated intracranial pressure and uncal herniation.
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Konular

Neurosurgery

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