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Significance of exercise-induced ventricular arrhythmia in stable coronary artery disease: a coronary artery surgery
Insights
Exercise-induced ventricular arrhythmia did not significantly impact 5-year event-free survival in patients with stable coronary artery disease (CAD). This finding applies to both minimal and significant CAD classifications, suggesting arrhythmia is not a primary prognostic indicator in this cohort.
Area of Science:
- Cardiology
- Clinical Medicine
- Public Health
Background:
- Stable coronary artery disease (CAD) management requires understanding prognostic indicators.
- Exercise-induced ventricular arrhythmia is a potential, yet debated, marker in CAD patients.
Purpose of the Study:
- To investigate the prognostic significance of exercise-induced ventricular arrhythmia in patients with stable coronary artery disease (CAD).
- To determine if exercise-induced ventricular arrhythmia affects long-term event-free survival in CAD patients.
Main Methods:
- Retrospective analysis of 1,486 patients from the Coronary Artery Surgery Study registry (1975-1979).
- Patients classified by CAD severity (minimal vs. significant) and presence of exercise-induced ventricular arrhythmia.
- Standard Bruce exercise test and cardiac catheterization used for assessment.
- Average follow-up of 4.3 years, assessing 5-year event-free survival.
Main Results:
- No significant difference in 5-year event-free survival between patients with and without exercise-induced ventricular arrhythmia in either minimal (76% vs. 88%) or significant CAD (71% vs. 76%) groups.
- Group IIA (significant CAD with arrhythmia) showed higher prior myocardial infarction and lower ejection fraction than Group IIB (significant CAD without arrhythmia).
Conclusions:
- Exercise-induced ventricular arrhythmia does not appear to be a significant prognostic factor for 5-year event-free survival in patients with stable coronary artery disease.
- Clinical characteristics, such as ejection fraction and prior myocardial infarction, may be more influential in predicting outcomes for CAD patients with significant disease.
Abstract:
This retrospective study examines the prognostic significance of exercise-induced ventricular arrhythmia in patients with stable coronary artery disease (CAD) who were included in the multicenter patient registry of the Coronary Artery Surgery Study. The population is composed of 1,486 patients selected from 1975 to 1979 and followed an average of 4.3 years. All underwent a standard Bruce exercise test and had CAD by cardiac catheterization at entry. Patients were classified into group I or II depending on whether they had minimal or significant CAD. (Significant CAD was defined as 70% or greater diameter reduction in any major coronary artery or 50% or greater narrowing in the left main artery.) They were further subclassified into groups A or B depending on whether or not they had exercise-induced ventricular arrhythmia. Groups IA (16 patients) and IB (229 patients) had similar clinical and angiographic characteristics except for the average ejection fraction (EF), which was 50% for group IA and 64% for group IB (p less than 0.05). Group IIA (130 patients) had a higher prevalence of previous myocardial infarction, a lower mean EF and a higher proportion of patients with at least 2 coronary arteries significantly narrowed than group IIB (1,111 patients). The 5-year event-free survival was not influenced by the presence of exercise-induced ventricular arrhythmia; it was 76 and 88% in groups IA and IB, respectively (difference not significant), and 71 and 76% in groups IIA and IIB, respectively (difference not significant).(ABSTRACT TRUNCATED AT 250 WORDS)