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Related Experiment Videos

Silent myocardial ischemia during mastication.

M J Shea, J E Deanfield, R A Wilson

    The American Journal of Medicine
    |February 1, 1987
    PubMed
    Summary

    Ambulatory monitoring reveals most myocardial ischemia episodes are silent, lacking symptoms. Everyday activities like stress or cold can trigger these silent ischemia events, confirmed by imaging.

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    Area of Science:

    • Cardiology
    • Diagnostic Imaging
    • Ischemic Heart Disease

    Background:

    • Ambulatory outpatient monitoring offers new insights into myocardial ischemia compared to traditional in-hospital tests.
    • Silent myocardial ischemia, characterized by ST segment depression without symptoms, is increasingly recognized.

    Observation:

    • Multiple episodes of ST segment depression were observed during ambulatory monitoring.
    • The majority of these ST segment changes were asymptomatic, highlighting 'silent' ischemia.

    Findings:

    • Positron emission tomography with rubidium 82 confirmed the ischemic nature of asymptomatic ST changes.
    • Everyday activities, including mental stress and cold exposure, can provoke both symptomatic and asymptomatic ischemia.
    • An unusual case of silent myocardial ischemia was observed during the act of chewing food.

    Implications:

    • These findings challenge conventional views of myocardial ischemia, emphasizing the prevalence of asymptomatic episodes.
    • Understanding triggers for silent ischemia is crucial for comprehensive patient management.
    • Further research into the mechanisms and management of silent ischemia is warranted.

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