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Enhanced late survival following coronary artery bypass graft operation for unstable versus chronic angina
Insights
Late survival after coronary artery bypass surgery improved by 1974. This study found that patients with unstable angina and good left ventricular function had the best long-term survival rates, despite initial presentation urgency.
Area of Science:
- Cardiology
- Cardiac Surgery
- Clinical Outcomes Research
Background:
- Late survival after coronary artery bypass surgery (CABS) demonstrates time-dependent improvements, notably by 1974.
- Subsets of patients undergoing CABS between 1974 and mid-1982 exhibited further enhanced survival.
- The urgency of clinical presentation as a determinant of survival post-CABS warrants examination.
Purpose of the Study:
- To investigate the urgency of clinical presentation as a determinant of late survival in patients undergoing coronary artery bypass surgery.
- To analyze the impact of ventricular function on long-term survival across different angina severities.
Main Methods:
- A retrospective study of 3,575 patients who underwent coronary artery bypass surgery.
- Analysis of survival rates based on clinical presentation urgency (chronic, progressive, unstable angina).
- Evaluation of left ventricular (LV) function as a prognostic factor in relation to angina severity and survival.
Main Results:
- Survival rates at 1 month, 5 years, and 8 years varied by angina type: chronic (98.3%, 88%, 79%), progressive (97.8%, 90%, 80%), and unstable (98.3%, 92%, 89%).
- Patients with unstable angina demonstrated the best long-term survival outcomes.
- Left ventricular function significantly impacted survival in chronic and progressive angina groups (p < 0.001) but not in the unstable angina group (p = 0.803).
Conclusions:
- The urgency of clinical presentation in coronary artery bypass surgery patients is paradoxically associated with survival outcomes.
- Good left ventricular function is a critical predictor of enhanced long-term survival, particularly in patients with chronic and progressive angina.
- Patients presenting with unstable angina, especially those with preserved left ventricular function, achieve superior long-term survival post-coronary artery bypass surgery.
Abstract:
Late survival following coronary artery bypass operation is time-frame dependent, with a major improvement occurring by 1974. In the cohort of patients undergoing operation between 1974 and mid-1982, subsets were present with further enhanced survival. In this study of 3,575 patients, the urgency of clinical presentation is examined as a survival determinant, and the results are seemingly paradoxical. Among the 1,404 patients with chronic angina, survival at 1 month was 98.3%; at 5 years, 88%; and at 8 years, 79%. Among the 1,008 patients with progressive angina, survival at 1 month was 97.8%; at 5 years, 90%; and at 8 years, 80%. Among the 1,163 patients with unstable angina, 1-month survival was 98.3%; 5-year survival, 92%; and 8-year survival, 89%. The best long-term results were obtained in patients with an acute clinical presentation. Ventricular function was an important determinant of late survival for the groups with chronic (p less than 0.001) and progressive (p less than 0.001) angina, but it had no effect in the group with unstable angina (p = 0.803). For the patients with chronic angina and good left ventricular (LV) function, survival was 99.5% at 1 month; 92% at 5 years; and 86% at 8 years. For those with poor LV function, the respective survival was 96%, 84%, and 71%. For the patients with progressive angina and good LV function, 1-month survival was 98.9%; 5-year survival, 94%; and 8-year survival, 83%. For those with poor LV function, the respective figures were 96.3%, 85%, and 76%. For the patients with unstable angina and good LV function, survival at 1 month was 97.8%; at 5 years, 92%; and at 8 years, 89%.(ABSTRACT TRUNCATED AT 250 WORDS)