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Myocardial revascularization: a rebuttal of the cooperative study
Insights
Coronary Artery Bypass Grafting (CABG) surgery at Saint Louis University Medical Center demonstrated significantly lower operative mortality and myocardial infarction rates compared to the VA study. CABG improved graft patency and long-term survival, particularly in patients with extensive coronary artery disease.
Area of Science:
- Cardiovascular Surgery
- Interventional Cardiology
- Clinical Outcomes Research
Background:
- Coronary Artery Bypass Grafting (CABG) is a critical intervention for severe coronary artery disease.
- Comparative studies are essential to evaluate surgical techniques and outcomes.
- The VA Cooperative Coronary Artery Study provides a benchmark for CABG outcomes.
Purpose of the Study:
- To compare the outcomes of CABG performed at Saint Louis University Medical Center (SLU) between 1972-1974 with those from the VA Cooperative Coronary Artery Study.
- To assess operative mortality, perioperative myocardial infarction, graft patency, angina relief, and long-term survival.
Main Methods:
- Retrospective analysis of 345 patients undergoing CABG at SLU (1972-1974).
- Comparison of SLU patient data with published data from the VA Cooperative Coronary Artery Study.
- Evaluation of key performance indicators including mortality, morbidity, graft patency, and survival rates.
Main Results:
- SLU CABG showed lower operative mortality (2.3% vs 5.6%) and perioperative myocardial infarction rates (8.4% vs 18%) compared to VA.
- Superior one-year graft patency rates at SLU (87% vs 71%).
- Significantly higher four-year survival rates for completely revascularized SLU patients (94%) versus VA groups (86%).
Conclusions:
- CABG performed at SLU during 1972-1974 yielded superior short-term and long-term outcomes compared to the VA study.
- The findings suggest CABG effectively prolongs life in patients with double and triple vessel coronary artery disease.
- Complete revascularization during CABG is associated with improved survival outcomes.
Abstract:
From January 1972 through December 1974, at Saint Louis University Medical Center (SLU), 345 patients similar to those of the VA Cooperative Coronary Artery Study received CABG. Operative mortality was SLU 2.3%, VA 5.6% (p < 0.05). Perioperative myocardial infarction rate was SLU 8.4%, VA 18% (p < 0.005). One year graft patency was SLU 87%, VA 71%; all grafts patent SLU 76%, VA 54%; at least one graft patent SLU 96%, VA 89%. SLU angina pectoris relief at five years was 90%. SLU patients free of myocardial infarction five years postoperatively was 83%. Comparative cumulative four year survivals were: [Table: see text] Cumulative four-year survival in 272 SLU patients (79%) completely revascularized was 94%, compared to SLU entire group of 95%, VA medical 86% (p < 0.002) and VA surgical 85% (p < 0.002). Comparing 1972-74 SLU results to VA medical and surgical groups, CABG prolonged life in patients with double and triple vessel disease and in those completely revascularized.