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Sinus arrest in acute myocardial infarction.

R Rokseth, L Hatle

    British Heart Journal
    |September 1, 1971
    PubMed
    Summary

    Sinus arrest, a heart rhythm issue, occurred in 32 patients with acute myocardial infarction. Most cases involved inferior infarction, with treatments including isoprenaline and pacemakers.

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    Area of Science:

    • Cardiology
    • Clinical Electrophysiology

    Background:

    • Sinus arrest is a cardiac arrhythmia where the heart's natural pacemaker fails to generate electrical impulses.
    • Its occurrence and clinical significance in acute myocardial infarction (AMI) patients require further investigation.

    Purpose of the Study:

    • To prospectively investigate the incidence, clinical presentation, and management of sinus arrest in patients experiencing AMI.
    • To analyze the association between sinus arrest and specific infarction locations and other arrhythmias.

    Main Methods:

    • A 4-year prospective study involving 1665 patients with acute myocardial infarction.
    • Continuous cardiac monitoring to detect arrhythmias, including sinus arrest.
    • Clinical data collection on patient demographics, infarction type, co-existing arrhythmias, and treatment outcomes.

    Main Results:

    • Sinus arrest was detected in 32 (1.9%) of 1665 AMI patients, with detection rates increasing over the study period.
    • Inferior infarction was the predominant type (31 of 32 patients).
    • Associated conditions included paroxysmal atrial fibrillation (12 patients), syncope (7 patients), and hypotension (19 patients).

    Conclusions:

    • Sinus arrest is an uncommon but significant arrhythmia in acute myocardial infarction, particularly with inferior wall involvement.
    • Intravenous isoprenaline is often effective for management, but pacemaker implantation may be necessary in select cases.
    • Increased monitoring capabilities enhance the detection rate of sinus arrest in AMI patients.

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