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Related Experiment Videos

Autonomic hyperactivity in patients with vasospastic angina.

K Tamada, Y Ito, H Fukuzaki

    Japanese Heart Journal
    |September 1, 1985
    PubMed
    Summary

    This study found that higher plasma catecholamine levels are linked to vasospastic angina, suggesting sympathetic nervous system overactivity contributes to this condition. Nifedipine reduced attacks but not catecholamine levels.

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    Area of Science:

    • Cardiology
    • Autonomic Nervous System Physiology

    Background:

    • Vasospastic angina (VSA) involves coronary artery spasms.
    • The role of the autonomic nervous system (ANS) in VSA is not fully understood.

    Purpose of the Study:

    • To investigate the involvement of the ANS in vasospastic angina.
    • To assess plasma catecholamine and cyclic nucleotide levels in VSA patients.

    Main Methods:

    • Measured plasma catecholamine and cyclic nucleotide levels.
    • Performed pilocarpine test in 19 VSA patients, 14 non-VSA angina patients, and 7 controls.
    • Administered nifedipine to assess its effect on anginal attacks and catecholamine levels.

    Main Results:

    • Significantly higher diurnal and nocturnal plasma catecholamines in angina patients, especially VSA patients, compared to controls.
    • Increased plasma catecholamines preceded spontaneous and pilocarpine-induced anginal attacks in VSA patients.
    • Nifedipine suppressed anginal attacks but did not normalize plasma catecholamine levels.

    Conclusions:

    • Increased sympathetic nervous system activity and responsiveness may contribute to vasospastic angina.
    • Parasympathetic hyperactivity might underlie the sympathetic overactivity observed in VSA.

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