Myocardial revascularization for unstable angina pectoris
G C Kaiser1, H V Schaff, T Killip
1Department of Surgery, St. Louis University, Missouri.
Insights
Coronary artery bypass grafting (CABG) for unstable angina pectoris shows similar outcomes to stable angina, but requires better preoperative management and myocardial preservation to reduce risks.
Area of Science:
- Cardiology
- Cardiac Surgery
- Vascular Surgery
Background:
- Unstable angina pectoris presents a significant challenge in cardiac surgery.
- Coronary artery bypass grafting (CABG) is a primary treatment modality.
- Outcomes and risk factors require detailed analysis.
Purpose of the Study:
- To evaluate the efficacy and safety of CABG in patients with unstable angina pectoris.
- To identify risk factors associated with morbidity and mortality.
- To compare outcomes with those of patients with chronic stable angina.
Main Methods:
- Systematic review of 14 reports published between 1978 and 1988.
- Inclusion of 6,136 patients undergoing CABG for unstable angina pectoris.
- Analysis of operative mortality, perioperative myocardial infarction, and postoperative low cardiac output.
Main Results:
- Mean operative mortality was 3.7%, perioperative myocardial infarction 9.9%, and low cardiac output 16%.
- No distinct risk factors for morbidity or mortality were identified compared to chronic stable angina.
- Outcomes including angina relief, survival, and late myocardial infarction were comparable to chronic stable angina.
Conclusions:
- CABG offers comparable benefits for unstable angina to stable angina.
- Subgroup analysis reveals varied prognoses within unstable angina.
- Improved preoperative management and myocardial preservation are crucial for reducing CABG-related complications.
Abstract:
We reviewed 14 reports from 1978 to 1988 of 6,136 patients with unstable angina pectoris treated by coronary artery bypass grafting (CABG). The mean age was 56.8 years, and 23% were female. Mean operative mortality in the 14 reports was 3.7% (1.2-8.5%). The mean incidence of perioperative myocardial infarction was 9.9% (3.8-17%). The mean incidence of postoperative low cardiac output was 16% (8-35%). No risk factors for morbidity or mortality different from those observed in patients with chronic stable angina were identified. Clinical subgroups of the heterogeneous group of patients with unstable angina pectoris are associated with different prognoses and treatment results. Variable pathological changes are associated with these subgroups. Reductions in morbidity and mortality of those patients undergoing CABG may require better preoperative management of the underlying pathological process and improved myocardial preservation at the time of CABG. Angina relief, improved survival, and reduction in late nonfatal myocardial infarction is similar to that observed in patients with chronic stable angina after CABG.
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