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Related Experiment Videos

Decrease in bradycardic effect of AQ-A 39 and alinidine in guinea-pig sinoatrial node depolarized by high external

C Lillie, W Kobinger

    Naunyn-Schmiedeberg'S Archives of Pharmacology
    |December 1, 1984
    PubMed
    Summary

    Two bradycardic agents, AQ-A 39 and alinidine, showed reduced effects on guinea-pig heart rate in high potassium conditions. Their mechanism differs from calcium antagonists like verapamil.

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    Area of Science:

    • Pharmacology
    • Cardiovascular Physiology

    Background:

    • The sinus node's spontaneous electrical activity regulates heart rate.
    • Bradycardic agents slow heart rate, but their precise mechanisms can vary.
    • Calcium antagonists are known to affect cardiac electrical activity.

    Purpose of the Study:

    • To investigate the effects of AQ-A 39 and alinidine on guinea-pig sinus node electrical discharge rate.
    • To compare the mechanism of action of AQ-A 39 and alinidine with calcium antagonists.

    Main Methods:

    • Studied intact guinea-pig sinus node preparations.
    • Applied varying external potassium concentrations (10.8 and 16.2 mmol/l).
    • Administered AQ-A 39, alinidine, and verapamil.

    Main Results:

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    • High external potassium diminished or abolished the bradycardic effects of AQ-A 39 and alinidine.
    • The negative chronotropic effect of verapamil was enhanced under high potassium conditions.
    • Bradycardic effects of AQ-A 39 and alinidine were reduced in depolarized preparations.

    Conclusions:

    • The mechanism of action for AQ-A 39 and alinidine is unlikely to be the same as calcium antagonists.
    • Bradycardic effects of AQ-A 39 and alinidine are dependent on the sinus node's membrane potential.
    • Further research is needed to elucidate the specific mechanisms of AQ-A 39 and alinidine.