(Circulation. 1995;92:73-79.)
© 1995 American Heart Association, Inc.
Articles |
Results of Revascularization in Patients With Severe Left Ventricular Dysfunction
From the Department of Surgery, University of Toronto (Ontario), Canada.
Correspondence to Dr L. Mickleborough, EN 13-217, The Toronto Hospital, 200 Elizabeth St, Toronto, Ontario, Canada M5G 2C4.
Background In patients with coronary artery disease and poor ventricular function (ejection fraction, <20%), bypass grafting remains a surgical challenge. This study evaluates experience with isolated revascularization in such patients.
Methods and Results In 79 consecutive patients (69 men, 10 women; average age, 59±9 years), preoperative ejection fraction was 18±5%. Indications for surgery were congestive heart failure (CHF) in 5 of 79 patients (6%), CHF and angina in 19 (24%), angina in 41 (52%), ventricular arrhythmias (VAs) in 8 (10%), and critical anatomy in 6 (8%). Some patients had prior VAs (23 of 79; 29%) or mitral regurgitation (18; 23%) and required emergent surgery (25; 32%). At surgery, temperature mapping ensured adequate distribution of antegrade cold cardioplegia, with 3.6±0.7 grafts per patient, including left internal mammary artery graft in 60 of 79 (76%) and endarterectomy in 14 (18%). Hospital mortality was 3.8%. Perioperative support included intra-aortic balloon pump in 18 of 79 (23%) and drugs for VAs in 28 (35%). Morbidity included myocardial infarction in 2 of 79 (2.5%) and stroke in 2 (2.5%). During follow-up, there were 19 late deaths. Actuarial survival was 94%, 82%, and 68% at 1, 2, and 5 years, respectively, and was similar in patients with severe angina, CHF, mitral regurgitation, or VAs. Freedom from sudden death was 100%, 98%, and 91% at 1, 2, and 5 years, respectively. Among survivors, angina improved in 84% and heart failure improved in 26%.
Conclusions These data support bypass graft surgery in patients with severe LV dysfunction. With careful cardioplegic techniques, hospital mortality was low (3.8%). Long-term survival is encouraging, with good relief of symptoms in most patients. Perioperative VAs are frequent but respond to medical treatment, with only 23% of patients discharged on antiarrhythmic drugs. Five-year freedom from sudden death is 91%, with only 3 late sudden deaths in this series.
Key Words: bypass • ventricles • arrhythmia
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