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Acute ST elevation myocardial infarction with angiographically normal coronary arteries: causes and outcomes

Walid Ahmar, Jeffrey Lefkovits

    International Journal of Cardiology
    |August 11, 2007
    PubMed

    Insights

    A small percentage of ST-elevation myocardial infarction (STEMI) patients show normal coronary arteries. Most cases remain cryptogenic, but long-term prognosis for these STEMI patients appears favorable.

    Area of Science:

    • Cardiology
    • Internal Medicine

    Background:

    • Investigates the incidence, etiology, and prognosis of ST-elevation myocardial infarction (STEMI) in patients with angiographically normal coronary arteries.
    • Retrospective analysis of 714 STEMI patients over a decade (1995-2005) identified 41 cases (5.7%) with normal coronary arteries.

    Discussion:

    • Identified specific causes in 32% of cases, including peri-myocarditis (11/41) and Takotsubo cardiomyopathy (2/41).
    • The majority of cryptogenic acute myocardial infarction (AMI) cases lacked a definitive diagnosis.
    • Mean patient age was 44±15 years, with a predominantly male demographic.

    Key Insights:

    • STEMI with normal coronary arteries is a distinct clinical entity with a low incidence.
    • Peri-myocarditis and Takotsubo cardiomyopathy are potential, though uncommon, causes.
    • Long-term follow-up (mean 44±30 months) revealed favorable outcomes, with only one non-cardiovascular death and one patient requiring pacing.

    Outlook:

    • Further research is needed to elucidate the underlying mechanisms of cryptogenic STEMI with normal coronary arteries.
    • Improved diagnostic tools may help identify etiologies in a larger proportion of these patients.
    • Continued monitoring is essential to confirm the long-term favorable prognosis in this subgroup.

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