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Which sedative agent is preferred during AVM surgery for neuroprotection? A. Propofol B. Diazepam C. Thiopental sodium D. Ketamine

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The textbook confirms propofol's role clearly. Here is the complete answer:

Answer: A. Propofol

Propofol is the preferred sedative/anesthetic agent for neuroprotection during AVM (arteriovenous malformation) surgery.

Why Propofol?

Propofol is favored for neuroprotection in neurovascular surgery due to several mechanisms and practical advantages:
  1. Burst Suppression: Propofol can be titrated to induce EEG burst suppression, which reduces the cerebral metabolic rate (CMRO2). This decreased metabolic demand is believed to offer brain protection during ischemic episodes.
  2. Practical Protocol: During planned regional ischemia (e.g., temporary clipping of cerebral vessels during aneurysm or AVM surgery), propofol is given as a large bolus (1-2 mg/kg) followed by a high-dose infusion (~150 mcg/kg/min), titrated to achieve burst suppression prior to the planned ischemic event.
    • Barash, Cullen, and Stoelting's Clinical Anesthesia, 9e, p. 3090
  3. Total Intravenous Anesthesia (TIVA): Propofol-based TIVA has been reported in cerebral aneurysm and AVM surgery precisely for its burst suppression capability and cerebral protection profile (Ravussin & de Tribolet, Neurosurgery, 1993, reporting 42 patients).
    • Miller's Anesthesia, 10e

Why Not the Others?

AgentReason Not Preferred
B. DiazepamBenzodiazepine - long acting, no reliable burst suppression, not titratable for neuroprotection
C. Thiopental sodiumBarbiturate with neuroprotective properties but largely replaced by propofol in practice due to prolonged sedation, cardiovascular depression, and slower recovery
D. KetamineNMDA antagonist - actually increases CMRO2 and ICP, making it contraindicated in most neurovascular surgeries

Key Concept

Propofol's ability to be rapidly titrated to burst suppression, its short half-life allowing for quick neurological assessment post-operatively, and its favorable cerebral hemodynamic profile (reduces CMRO2 and CBF while maintaining cerebrovascular autoregulation) make it the standard of care for neuroprotection in AVM surgery.
The answer is A. Propofol.
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