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Related Experiment Videos

Coronary hypertonia and angina.

Y Choquet, J Proulx, R Primeau

    Canadian Medical Association Journal
    |July 20, 1974
    PubMed
    Summary
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    Coronary artery spasm, a condition causing unstable angina, was identified in a patient. Atrial pacing reproduced symptoms, confirming left coronary artery hypertonia as the cause of variant angina and ischemia.

    Area of Science:

    • Cardiology
    • Vascular Physiology

    Background:

    • Unstable angina can be associated with coronary artery abnormalities.
    • Coronary artery spasm is a potential cause of ischemic events.

    Purpose of the Study:

    • To investigate the role of coronary hypertonia in a patient presenting with unstable angina.
    • To elucidate the mechanism of variant angina in the presented case.

    Main Methods:

    • Clinical observation of a patient with unstable angina.
    • Reproduction of symptoms including electrocardiographic changes and lactate production via atrial pacing.
    • Coronary arteriography before and after nitroglycerin administration.

    Main Results:

    • Coronary hypertonia was observed in the patient.

    Related Experiment Videos

  • Atrial pacing successfully reproduced the clinical picture, electrocardiographic changes, lactate production, and coronary hypertonia.
  • Coronary arteriogram showed diffuse spasm relieved by nitroglycerin, indicating normal coronary arteries without spasm after treatment.

    • Conclusions:

    • Left coronary artery hypertonia (spasm) was identified as the cause of variant angina and subendocardial ischemia in this patient.
    • The study highlights the importance of identifying coronary artery spasm in the etiological diagnosis of angina.
    • Pharmacological management with nitroglycerin effectively relieved the coronary spasm.