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[Surgical treatment of coronary circulation disorders]
Insights
Aorto-coronary bypass surgery effectively relieves angina and improves exercise capacity. While controversial for life expectancy, it significantly benefits patients with left main or three-vessel disease.
Area of Science:
- Cardiovascular Surgery
- Interventional Cardiology
- Clinical Outcomes Research
Context:
- Coronary artery disease management remains a significant clinical challenge.
- The long-term impact of aorto-coronary bypass (ACB) on patient survival is debated.
- Advances in surgical techniques and perioperative care have evolved.
Purpose:
- To evaluate the objectives and outcomes of aorto-coronary bypass surgery.
- To assess the influence of ACB on angina, exercise tolerance, and life expectancy.
- To identify patient subgroups who benefit most from ACB.
Summary:
- ACB surgery aims to alleviate angina, enhance exercise performance, and prolong life.
- Prospective trials indicate improved survival in patients with left main and three-vessel disease.
- Graft patency rates are high (85-90% at 1 year), with low annual occlusion rates (<3%).
- Indications include refractory angina and high-risk anatomical subsets (left main, three-vessel disease).
Impact:
- ACB surgery offers significant benefits for specific patient populations with coronary artery disease.
- Improved surgical outcomes and graft patency contribute to better patient prognoses.
- Key determinants of success include complete revascularization and ventricular function.
Abstract:
The objectives of aorto-coronary bypass surgery are threefold: relief of angina pectoris, increase in exercise performance and prolongation of life. The effect of surgery on ischemic pain and exercise tolerance is widely accepted, but the influence of bypass grafting on life expectancy is still controversial. Recent results of prospective randomized trials, however, have shown significantly better survival for surgically treated patients with specific anatomic characteristics such as left main disease and three-vessel disease. Among the operative risks, hospital mortality (1% in our experience) and incidence of perioperative myocardial infarction (around 5%, usually asymptomatic clinical course) have decreased with growing surgical practice and application of cold cardioplegia. Postoperative angiographic studies reveal 85% to 90% graft patency rate at one year; later the mean annual occlusion rate is reported to be less than 3%. The aorto-coronary bypass operation is indicated mainly for the following two groups of patients: 1. those in whom angina or drug therapy results in a restriction of working capacity or an undesirable change in lifestyle despite appropriate medical treatment; 2. the two subsets of patients being exposed to a particularly high risk of myocardial infarction or sudden death: patients with left main disease and patients with three-vessel disease. The benefits of coronary bypass surgery depend on several conditions: major determinants are completeness of revascularization, suitability of distal coronary segments for bypass grafting, and degree of ventricular impairment.