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Does left ventricular aneurysmectomy improve ventricular function in patients undergoing coronary bypass surgery?
Insights
Left ventricular aneurysmectomy and coronary artery bypass grafting improve exercise capacity and ventricular function in heart failure patients. While resting ejection fraction remains unchanged, symptoms like angina are significantly reduced post-surgery.
Area of Science:
- Cardiology
- Cardiac Surgery
- Nuclear Cardiology
Background:
- Patients with left ventricular aneurysm often suffer from congestive heart failure and angina pectoris.
- Surgical interventions aim to improve cardiac function and alleviate symptoms in these patients.
Purpose of the Study:
- To evaluate the impact of left ventricular aneurysmectomy combined with coronary artery bypass grafting on cardiac function and symptoms.
- To assess changes in ventricular scintigraphy at rest and during exercise before and after surgical intervention.
Main Methods:
- Multiple gated ventricular scintigraphy (rest and exercise) was performed on 14 patients before and at 6 weeks and 6 months after surgery.
- Assessment included left ventricular ejection fraction and regional wall motion score.
- Patient-reported symptoms (angina) and functional class were also monitored.
Main Results:
- Significant improvement in exercise workload and abolition of exercise-induced regional contraction abnormalities were observed 6 weeks post-surgery.
- Angina symptoms resolved in all surviving patients at 6 weeks, with improved functional class.
- Resting left ventricular ejection fraction showed no significant change, though regional wall motion scores improved.
Conclusions:
- Left ventricular aneurysmectomy and coronary artery bypass grafting can improve exercise tolerance, exercise ventricular function, and reduce angina symptoms.
- The combined surgical approach offers significant symptomatic and functional benefits, despite no improvement in resting ejection fraction.
- The distinct contributions of aneurysmectomy versus coronary artery bypass grafting to these improvements require further investigation.
Abstract:
Fourteen consecutive patients undergoing left ventricular aneurysmectomy and coronary artery bypass grafting were studied by multiple gated ventricular scintigraphy at rest and during exercise before and at six weeks and six months after surgery. All had congestive heart failure and 12 angina pectoris. Before operation left ventricular ejection fraction fell significantly with exercise, as did the regional wall motion score. Six weeks after surgery all surviving patients were free of angina, with an improvement in functional class; the total exercise workload improved significantly, but resting left ventricular ejection fraction was unchanged; the regional wall motion score improved in both the anterior and left anterior oblique projections, although extensive areas of abnormal contraction persisted. Exercise left ventricular ejection fraction improved significantly after operation at six weeks, and previous exercise induced abnormalities of regional contraction were abolished. Six months after operation angina pectoris had recurred in one patient, but there was no further change in ventricular function in the remainder. Although resting ejection fraction is not improved, symptoms, exercise workload, and exercise ventricular function can be improved by aneurysmectomy and coronary artery bypass grafting, but the respective contribution of these two procedures remains uncertain.