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Vasodilators during cerebral aneurysm surgery

K Abe1

  • 1Department of Anaesthesia, Osaka Police Hospital, Japan.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|August 1, 1993
PubMed
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This review examines anesthetic implications of vasoactive drugs on cerebral circulation, crucial for managing cerebral aneurysm surgery and subarachnoid hemorrhage complications like vasospasm and ischemia.

Area of Science:

  • Anesthesiology
  • Cerebrovascular Medicine
  • Pharmacology

Background:

  • Subarachnoid hemorrhage (SAH) can lead to reduced cerebral blood flow, disturbed vasoreactivity, and cerebral arterial vasospasm, increasing the risk of ischemic brain damage.
  • Intraoperative hypertension during cerebral aneurysm surgery is a dangerous complication, potentially exacerbated by SAH-related vasospasm.
  • The use of induced hypotension has decreased but remains valuable for specific aneurysm surgeries.

Purpose of the Study:

  • To review the anesthetic implications of vasoactive compounds on cerebral circulation.
  • To discuss the clinical importance of these agents for practicing anesthesiologists.
  • To evaluate vasodilating agents for managing intraoperative hypertension and hypotension during neurosurgery.

Main Methods:

Related Experiment Videos

  • Literature review focusing on validity and clinical applicability.
  • Inclusion of animal studies only when human data were lacking.
  • Analysis of various vasodilating agents, including prostaglandin E1, sodium nitroprusside, nitroglycerin, trimetaphan, adenosine, calcium antagonists, and inhalational anesthetics.

Main Results:

  • Sodium nitroprusside, nitroglycerin, and isoflurane are recommended for induced hypotension.
  • Prostaglandin E1, nicardipine, and nitroglycerin do not significantly alter carbon dioxide reactivity.
  • Nitroglycerin increases local cerebral blood flow, trimetaphan decreases it, and prostaglandin E1 has no significant effect.

Conclusions:

  • Understanding the cerebral vascular effects of vasodilators is crucial for managing blood pressure during neurosurgery.
  • Prompt treatment of intraoperative hypertension is essential to minimize rebleeding and rupture risks.
  • Vasoactive drug selection requires careful consideration of their impact on cerebral circulation, especially in SAH patients.