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Functional capabilities following coronary bypass surgery.

P K Wilson, C M Maresh, J W Edgett

    Medicine and Science in Sports
    |January 1, 1977
    PubMed
    Summary
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    Coronary bypass surgery (CBS) improved patients' functional capacity, increasing oxygen uptake and exercise tolerance. Graded exercise tests (GXT) effectively evaluated these improvements post-surgery, with many patients experiencing relief from angina pectoris symptoms.

    Area of Science:

    • Cardiology
    • Cardiovascular Surgery
    • Exercise Physiology

    Background:

    • Angina pectoris (AP) significantly limits functional capacity.
    • Coronary bypass surgery (CBS) aims to restore myocardial oxygen supply.
    • Objective evaluation of CBS effectiveness is crucial for patient management.

    Purpose of the Study:

    • To evaluate changes in myocardial oxygen supply and functional capacity after CBS.
    • To assess the role of graded exercise testing (GXT) in objectively measuring CBS outcomes.
    • To determine the correlation between pre-operative arterial occlusion and post-operative functional status.

    Main Methods:

    • 19 patients with AP underwent symptom-limited maximal GXT before and after CBS.
    • Patients participated in a 10-week "at home" exercise program post-surgery.

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  • Key parameters measured included predicted oxygen uptake, workload, rate pressure product, terminal heart rate, and ST segment depression.

    • Main Results:

    • Significant increases in predicted oxygen uptake (p < .002) and workload (p < .002) were observed post-CBS.
    • Rate pressure product also increased significantly (p < .02), suggesting enhanced myocardial blood flow.
    • 10 out of 16 patients with pre-operative ST depression and AP experienced complete symptom relief.

    Conclusions:

    • CBS effectively improves functional capacity and exercise tolerance in patients with angina pectoris.
    • Non-invasive functional GXT is a valuable tool for objectively evaluating the effectiveness of CBS.
    • While CBS provides significant benefits, correlations with pre-operative occlusion severity or graft number were not significant in this cohort.