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Coronary artery bypass graft surgery: clinical decision making and cost-effectiveness analysis
Insights
Decision analysis suggests aortocoronary bypass surgery is superior to medical management for most coronary artery disease patients. The procedure offers improved quality-adjusted life expectancy, even for those with less severe disease.
Area of Science:
- Cardiology
- Decision Analysis
- Health Economics
Background:
- Coronary artery disease (CAD) presents complex treatment choices between surgical intervention and medical management.
- Evaluating these options requires integrating clinical data with patient preferences for survival and quality of life.
Purpose of the Study:
- To utilize decision-analytic techniques to compare aortocoronary bypass surgery with medical management for hypothetical CAD patients.
- To quantify treatment benefits in terms of quality-adjusted life expectancy.
Main Methods:
- A decision framework was developed incorporating key variables affecting treatment choice.
- Probability estimates were sourced from expert cardiologists and cardiac surgeons.
- Patient preferences were elicited using utility values for different health outcomes, including angina severity and survival duration.
Main Results:
- Decision analysis favored aortocoronary bypass surgery for 13 out of 14 hypothetical patients, including those with one- and two-vessel disease.
- Medical management was preferred only for a patient with mild angina, severe left ventricular dysfunction, and a generally poor prognosis.
- Results were sensitive to long-term survival probabilities but not operative mortality rates.
Conclusions:
- Aortocoronary bypass surgery is generally favored over medical management for coronary artery disease patients when considering quality-adjusted life expectancy.
- Discrepancies between clinical judgment and decision analysis highlight the need for structured decision-making tools.
- Cost-effectiveness analysis indicates significant value for surgery, with costs per quality-adjusted year of life gained ranging from $1,500 to $32,000.
Abstract:
Decision-analytic techniques were used to evaluate the choice between an aortocoronary bypass operation and medical management in a set of hypothetical patients with coronary artery disease. The decision framework incorporates variables believed to have an important bearing on the choice of treatment. Probability estimates were obtained from two cardiologists and one cardiac surgeon. Patient preferences for the trade-off between years of survival and the quality of life as reflected by the severity of angina pectoris were made explicit by assigning utility values to alternative health outcomes. The results are expressed in terms of quality-adjusted years of life expectancy. Decision analysis favored operation for 13 of the 14 hypothetical patients, including patients with one- and two-vessel disease. The one patient for whom medical treatment was preferred had mild angina pectoris, severe left ventricular dysfunction, and a poor prognosis regardless of therapeutic modality. The results are sensitive to changes in the probability of long-term survival, but not to changes in operative mortality rates. In five patients, the physicians' clinical judgments favored medical treatment, whereas their decision-analysis-derived estimates of survival favored operation. Possible explanations for these discrepancies are discussed. A simplified cost-effectiveness analysis for patients in whom surgery was the optimal treatment indicated costs ranging from $1,500 to $250,000 per year of life gained and from $1,500 to $32,000 per quality-adjusted year of life gained.