Related Experiment Videos
[Coronary artery bypass surgery in patients with poor left ventricular function]
1Department of Thoracic and Cardiovascular Surgery, St Mary's Hospital, Kurume, Japan.
Insights
Coronary artery bypass grafting (CABG) can yield excellent results for patients with poor left ventricular function, especially when myocardial viability is confirmed. This study shows significant improvement in cardiac function and exercise tolerance post-CABG.
Area of Science:
- Cardiovascular Surgery
- Cardiac Function Assessment
- Myocardial Viability Studies
Context:
- Indications for coronary artery bypass grafting (CABG) in patients with severely impaired left ventricular function are not well-established.
- Poor left ventricular function, defined as ejection fraction < 0.3, presents unique challenges for surgical intervention.
- Left main trunk or equivalent stenosis necessitates aggressive revascularization strategies.
Purpose:
- To evaluate the outcomes of CABG in a cohort of patients with poor left ventricular function.
- To assess the impact of CABG on cardiac function and exercise tolerance in this high-risk group.
- To determine the feasibility and efficacy of CABG in selected patients with compromised ejection fraction.
Summary:
- A retrospective review of 7 patients with ejection fraction < 0.3 who underwent CABG.
- All patients had significant coronary artery disease, including left main stenosis.
- Post-CABG, 6 out of 7 patients demonstrated marked improvement in left ventricular function and exercise capacity, with one early mortality.
Impact:
- CABG can be a successful revascularization strategy for carefully selected patients with poor left ventricular function.
- Confirmation of myocardial viability is crucial for optimizing outcomes in these patients.
- The study suggests that CABG can significantly improve quality of life and functional capacity in this challenging patient population.
Abstract:
As the indications for coronary artery bypass grafting (CABG) among patients with poor left ventricular function remain incompletely defined, We undertook the study to assess the results of CABG surgery for a group of such patients. We retrospectively reviewed the clinical features and outcome for 7 patients with poor left ventricular function defined as an ejection fraction below 0.3 who underwent CABG. The mean age of the patients was 63 years (range, 38 to 78 years), and 4 were 70 years of age or older. All patients had history of previous myocardial infarction, and all had left main trunk stenosis or left main equivalent stenosis. The patients underwent CABG with three to six distal anastomoses (mean, 4.3/patient), the internal thoracic artery could be used in all patients, for one or two distal anastomoses (mean, 1.6/patient). Combined coronary endarterectomy was performed in 2 patients. With the exception of one 78-year-old patient with renal failure who died during the early postoperative period, all patients showed marked postoperative improvement in cardiac function. Cardiac catheterization and exercise stress test studies revealed significant improvement in left ventricular function and exercise tolerance in these six patients. These results suggest that excellent results can be obtained with CABG surgery in patients with poor left ventricular function when the viability of the myocardium in the bypassed area has been confirmed.