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Medical therapy or coronary artery bypass graft surgery for chronic stable angina: an update using decision analysis
Y S Kwok1, C Kim, P A Heidenreich
1Division of General Internal Medicine, University of Washington Medical Center, Seattle, Washington 98105-6920, USA.
Insights
Advances in medical and surgical treatments for chronic stable angina have improved survival rates for both approaches. Current therapies offer similar survival gains, maintaining the original conclusions of bypass surgery trials.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Clinical Trial Analysis
Background:
- Early trials in the 1980s compared medical and surgical treatments for chronic stable angina.
- Contemporary therapies have significantly reduced mortality and myocardial infarction rates in coronary artery disease.
- Current treatment guidelines incorporate advancements in managing stable angina.
Purpose of the Study:
- To simulate a comparative trial of coronary artery bypass graft surgery versus medical therapy for chronic stable angina.
- To evaluate outcomes using decision analysis and current treatment recommendations.
- To assess the impact of modern therapies on survival rates in angina patients.
Main Methods:
- A Markov decision analysis model was employed to compare 5- and 10-year outcomes.
- Baseline data were derived from a meta-analysis of existing treatment trials.
- Contemporary risk reduction data were sourced from randomized trials and meta-analyses.
Main Results:
- All patient subgroups showed modest survival gains with current therapies.
- At 5 years, survival was 90% for medical therapy and 94% for bypass surgery.
- Patients with triple-vessel disease and low ejection fraction also demonstrated improved survival with surgery.
Conclusions:
- Modern treatments have enhanced outcomes for both medical and surgical management of chronic stable angina.
- The magnitude of survival improvement was comparable between the two treatment groups.
- The fundamental conclusions from earlier bypass surgery trials remain valid.
Purpose:
Randomized trials comparing medical and surgical therapies for the treatment of chronic stable angina were completed in the early 1980s. Therapies developed since then have decreased mortality and myocardial infarction rates from coronary artery disease. Using decision analysis and incorporating current recommendations for treatment, we simulated a trial comparing coronary artery bypass graft surgery and medical therapy.
Methods:
A Markov decision analysis model was constructed to compare the 5-year and 10-year outcomes of a simulated trial of medical therapy versus bypass surgery for stable chronic angina. Baseline data were obtained from a meta-analysis of trials comparing the two treatments. Data on risk reduction from contemporary therapies were obtained from randomized trials and meta-analyses.
Results:
All subgroups experienced modest gains in survival with current therapies. At 5 years, the survival rate was 90% in the medical group (an absolute gain of 6%) and 94% in the surgical group (an absolute gain of 4%). Similar results were obtained for patients with triple-vessel disease. Among patients with a low ejection fraction, the 5-year survival rate was 85% for medical patients and 92% for surgical patients. Sensitivity analyses did not substantially affect the conclusions.
Conclusion:
Advances in the treatment of chronic stable angina have improved the outcome both for patients treated initially with surgery and for those treated initially with medical therapy. The improvements were of similar magnitude in both groups, so the fundamental conclusions of the bypass trials are unchanged.