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Deliberate hypotension.

M W Ewards, D C Flemming

    The Surgical Clinics of North America
    |August 11, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Deliberate hypotension, a surgical technique, reduces blood loss and improves surgical outcomes. Careful monitoring is essential to mitigate risks of inadequate organ perfusion, especially in hypertensive patients.

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    Area of Science:

    • Anesthesiology
    • Surgical Techniques
    • Cardiovascular Physiology

    Background:

    • Deliberate hypotension is a surgical strategy to minimize blood loss and enhance surgical field visibility.
    • It can also prevent dangerous intraoperative and postoperative hypertension.
    • Potential risks include inadequate organ perfusion, particularly to the brain, heart, and kidneys.

    Purpose of the Study:

    • To evaluate the safety and efficacy of deliberate hypotension in surgical procedures.
    • To define safe pressure thresholds for normotensive and hypertensive patients.
    • To outline appropriate monitoring and management strategies.

    Main Methods:

    • Induction of hypotension using agents like sodium nitroprusside or trimethaphan camsylate after stable anesthesia (halothane/enflurane).

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  • Close monitoring of intra-arterial pressure, electroencephalogram, electrocardiogram, and arterial blood gas tensions.
  • Postoperative observation is crucial.

    • Main Results:

    • In normotensive patients, risks are minimal when systolic pressure remains above 80 torr; mean pressure of 50-60 torr may be acceptable.
    • Hypertensive patients are at risk of cerebral ischemia at higher pressures and should generally avoid deliberate hypotension.
    • Severe hypertension can be avoided using hypotensive agents.

    Conclusions:

    • Deliberate hypotension is a safe and effective technique for reducing blood loss and facilitating complex surgeries when carefully prepared and monitored.
    • Risk-benefit analysis is crucial, especially considering patient's pre-existing conditions like hypertension.
    • Continuous monitoring and close postoperative care are paramount for patient safety.