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Related Experiment Videos

Myocardial infarct imaging after cardiac surgery.

D Panetta, C C Wong, L M Dugdale

    The Australian and New Zealand Journal of Surgery
    |April 1, 1979
    PubMed
    Summary

    Postoperative myocardial imaging revealed a 23% incidence of myocardial infarction in cardiac surgery patients. This suggests conventional electrocardiogram and enzyme criteria may underestimate the true incidence of perioperative myocardial infarction.

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    Area of Science:

    • Cardiology
    • Nuclear Medicine
    • Cardiovascular Surgery

    Background:

    • Cardiac surgery, including coronary artery bypass grafting (CABG) and valve replacement, carries a risk of perioperative myocardial infarction.
    • Conventional diagnostic methods like electrocardiography (ECG) and cardiac enzyme levels may not fully capture infarction events occurring during or after surgery.

    Purpose of the Study:

    • To assess the incidence of perioperative myocardial infarction using technetium pyrophosphate scintigraphy in patients undergoing cardiac surgery.
    • To compare scintigraphic findings with conventional ECG and cardiac enzyme criteria for diagnosing myocardial infarction.

    Main Methods:

    • One hundred nineteen patients undergoing cardiac surgery were evaluated with postoperative technetium pyrophosphate myocardial imaging.

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  • Data on surgical procedures (CABG, other cardiac surgery), intraoperative variables, and diagnostic criteria (ECG, enzymes) were collected.

    • Main Results:

    • Overall, 23% of patients exhibited positive myocardial scintigrams, indicating infarction.
    • Patients undergoing CABG alone had a 23% positive scintigram rate, while those with CABG and other procedures had a 46% rate.
    • Cardiac enzyme levels were higher in patients with positive scintigrams, though not consistently statistically significant. Intraoperative factors like vent use or bypass time did not correlate with positive scans.

    Conclusions:

    • Technetium pyrophosphate scintigraphy indicates a higher incidence of perioperative myocardial infarction (23%) after cardiac surgery than suggested by traditional ECG and enzyme markers.
    • Myocardial imaging may be a more sensitive tool for detecting infarction in the context of cardiac surgery.