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Related Experiment Videos

Systemic hypotension in neurosurgery.

D Yashon, Magness, W M Vise

    Journal of Neurosurgery
    |November 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Elective hypotension during surgery reduces bleeding and aids aneurysm repair. Careful monitoring is crucial to prevent brain damage from reduced blood flow, with electroencephalogram potentially offering early detection.

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    Area of Science:

    • Neurosurgery
    • Anesthesiology
    • Cerebrovascular Surgery

    Background:

    • Intraoperative hypotension is used to manage hemorrhage and improve surgical conditions during aneurysm repair.
    • The optimal agents and techniques for inducing hypotension are still debated.
    • Reduced cerebral blood flow can lead to significant biochemical and histological brain alterations.

    Purpose of the Study:

    • To review the benefits and risks of elective intraoperative hypotension in aneurysm surgery.
    • To discuss agents and techniques for inducing controlled hypotension.
    • To highlight methods for monitoring and preventing cerebral injury during hypotensive anesthesia.

    Main Methods:

    • Review of existing literature on intraoperative hypotension for aneurysm surgery.

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  • Discussion of anesthetic agents like trimethaphan, sodium nitroprusside, and halothane.
  • Analysis of biochemical markers and histological changes associated with cerebral hypoperfusion.

    • Main Results:

    • Trimethaphan, sodium nitroprusside, and halothane are effective hypotensive agents.
    • Prolonged hypotension can cause astrocyte swelling and endothelial cell damage due to altered brain metabolism (reduced ATP, elevated lactate).
    • Hypothermia may be beneficial for longer hypotensive periods, but is deemed unnecessary for short durations.

    Conclusions:

    • Elective hypotension is valuable for aneurysm surgery, but requires careful management to avoid cerebral ischemia.
    • Halothane may offer neuroprotection by reducing cerebral oxygen consumption, but is contraindicated in elevated intracranial pressure.
    • Electroencephalogram monitoring may provide early detection of brain vulnerability during prolonged hypotension.