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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

Prevalence and prognosis of electrocardiographic findings in middle-aged men

G Rose, P J Baxter, D D Reid

    British Heart Journal
    |June 1, 1978
    PubMed

    Insights

    Screening electrocardiograms identified specific heart abnormalities like Q waves and ST depression, predicting future coronary heart disease risk. However, some ECG findings showed little association with increased mortality in this male civil servant cohort.

    Area of Science:

    • Cardiology
    • Preventive Medicine
    • Epidemiology

    Background:

    • Electrocardiograms (ECGs) are crucial for assessing cardiovascular health.
    • The prognostic significance of ECG findings identified during screening may differ from those found in clinical practice.
    • Understanding the predictive value of specific ECG patterns in asymptomatic individuals is essential for early risk stratification.

    Purpose of the Study:

    • To evaluate the association between electrocardiographic findings from a screening examination and subsequent coronary heart disease (CHD) in middle-aged men.
    • To compare the prognostic implications of specific ECG abnormalities detected at screening versus those identified during routine clinical care.
    • To assess the relationship between ECG patterns, age trends, symptomatic history, and five-year CHD mortality rates.

    Main Methods:

    • A large-scale screening examination was conducted on 18,403 male civil servants aged 40-64.
    • Electrocardiograms (limb leads only) were meticulously coded using the Minnesota Code with rigorous quality control.
    • The association of ECG findings with CHD was analyzed concerning age, symptoms, and five-year mortality.

    Main Results:

    • Positive associations with CHD were observed for Q waves, left axis deviation, ST depression, T wave changes, ventricular conduction defects, and atrial fibrillation.
    • ECG findings such as increased R amplitude, altered PR or QT intervals, premature beats, and extreme heart rates showed generally unimpressive associations with CHD.
    • Men with screening ECG patterns suggesting ischemia had a CHD mortality rate of just over 1% per year, which was even lower in asymptomatic individuals.

    Conclusions:

    • Specific electrocardiographic abnormalities identified during screening have a distinct prognostic value for coronary heart disease compared to clinical practice.
    • Screening ECGs can identify individuals at risk for future CHD, although the absolute risk in this cohort was relatively low.
    • The findings underscore the importance of interpreting screening ECGs within the context of the individual's overall health status and symptoms.

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