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Indications for coronary artery bypass surgery in patients with chronic angina pectoris: implications of the
Insights
Coronary artery bypass surgery improves survival for most patients with left main coronary artery stenosis. For three-vessel disease, surgery benefits those with left ventricular dysfunction, while medical management may suffice for others.
Area of Science:
- Cardiology
- Cardiovascular Surgery
- Clinical Trials
Background:
- Major randomized trials compare medical vs. surgical therapy for coronary artery disease (CAD).
- These studies significantly impact CAD patient management.
- Previous research provided concordant data on surgical outcomes for asymptomatic/mildly symptomatic patients.
Purpose of the Study:
- To analyze the impact of medical vs. surgical therapy on survival in patients with coronary artery disease.
- To resolve discrepancies in surgical recommendations for three-vessel disease.
- To clarify the role of inducible ischemia in risk stratification for patients with three-vessel disease and preserved left ventricular function.
Main Methods:
- Analysis of data from three major randomized clinical trials comparing medical and surgical interventions for CAD.
- Long-term follow-up of patient cohorts, including the Veterans Administration Cooperative Study and the Coronary Artery Surgery Study (CASS).
- Evaluation of left ventricular function and inducible ischemia as predictors of outcomes.
Main Results:
- Coronary artery bypass surgery (CABS) improves survival in left main coronary artery stenosis.
- CABS does not enhance survival in mildly symptomatic patients with one- or two-vessel disease.
- Long-term data show improved survival with CABS in three-vessel disease plus left ventricular dysfunction.
Conclusions:
- CABS is recommended for most left main coronary artery stenosis patients, with exceptions for low-risk subgroups.
- Surgical management improves survival in three-vessel disease patients with left ventricular dysfunction.
- Inducible ischemia may identify high-risk patients with three-vessel disease and preserved left ventricular function, potentially explaining trial result discrepancies.
Abstract:
The three major randomized studies of medical vs surgical therapy in patients with coronary artery disease have had a major impact in the management of patients with this disease. For the most part, these multicenter trials have provided concordant information regarding the influence of surgery on survival in asymptomatic or mildly symptomatic patients. It has been demonstrated that coronary artery bypass surgery improves survival in patients with stenosis of the left main coronary artery. Bypass surgery probably should be performed in most patients with this lesion, although studies have identified low-risk subgroups in whom surgery may not improve survival. There are also concordant data that survival is not enhanced by surgery in mildly symptomatic patients with either one- or two-vessel disease. The important discrepancies regarding the role of surgery in three-vessel disease have been resolved to a major extent. Long-term follow-up studies in the Veterans Administration Cooperative Study and the Coronary Artery Surgery Study (CASS) demonstrate improved survival with surgical management in patients with three-vessel disease and left ventricular dysfunction. The remaining controversy regards management of patients with three-vessel disease and normal left ventricular function; this may be resolved by studies indicating that inducible left ventricular ischemia in patients with three-vessel disease and preserved left ventricular function at rest identifies patients at higher risk during medical management. Different proportions of such patients entered into the multicenter studies may explain the discordant results in three-vessel disease and normal left ventricular function reported by the European trial and CASS.(ABSTRACT TRUNCATED AT 250 WORDS)