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Related Experiment Videos

Narcotics decrease heart rate during inhalational anesthesia.

M K Cahalan, F W Lurz, E I Eger

    Anesthesia and Analgesia
    |February 1, 1987
    PubMed
    Summary
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    Inhalational anesthetics like enflurane, halothane, and isoflurane do not significantly increase heart rate. However, premedication with morphine or administration of fentanyl can significantly decrease heart rate during surgery.

    Area of Science:

    • Anesthesiology
    • Cardiovascular Physiology

    Background:

    • Understanding the cardiovascular effects of anesthetic agents is crucial for patient safety.
    • Inhalational anesthetics and narcotics can influence heart rate (HR) through various mechanisms.

    Purpose of the Study:

    • To determine the heart rate (HR) response to enflurane, halothane, and isoflurane.
    • To investigate the effects of morphine and fentanyl on HR during anesthesia.

    Main Methods:

    • 81 healthy patients undergoing elective surgery were randomized into six groups.
    • Groups received one of three inhalational anesthetics (enflurane, halothane, isoflurane) with or without morphine premedication or fentanyl administration.
    • Heart rate was monitored throughout anesthesia and early surgery.

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    Main Results:

    • No significant HR increase was observed with any inhalational anesthetic alone.
    • Morphine premedication tended to decrease HR, while its absence tended to increase HR.
    • Fentanyl administration significantly decreased HR across all anesthetic groups. Halothane with morphine resulted in the lowest HR.

    Conclusions:

    • Inhalational anesthetics, at the doses used, do not significantly increase heart rate.
    • Morphine and fentanyl administration can significantly decrease heart rate during surgical anesthesia.