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(Circulation. 1999;100:II-119.)
© 1999 American Heart Association, Inc.

Surgery for Coronary Artery Disease

Risk Stratification for Coronary Bypass Surgery in Patients With Left Ventricular Dysfunction

Analysis of the Coronary Artery Bypass Grafting Patch Trial Database

Michael Argenziano, MD; Henry M. Spotnitz, MD; William Whang, MD; J. T. Bigger, Jr, MD; Michael Parides, PhD; Eric A. Rose, MD

From the Departments of Surgery (M.A., H.M.S., E.A.R.) and Medicine (W.W., J.T.B., M.P.), Columbia University College of Physicians and Surgeons, New York, NY.

Correspondence to Michael Argenziano, MD, c/o Eric A. Rose, MD, Division of Cardiothoracic Surgery, Milstein Hospital, Room 7-435, 177 Fort Washington Ave, New York, NY 10032. E-mail ma66{at}columbia.edu

Background—Preoperative characteristics may influence morbidity and mortality in patients undergoing coronary artery bypass grafting (CABG). The CABG Patch Trial was designed to assess the impact of prophylactic insertion of an implantable cardioverter-defibrillator in patients undergoing high-risk CABG. This database was used to investigate the influence of symptomatic congestive heart failure (CHF) and angina on morbidity and mortality in CABG patients with ventricular dysfunction.

Methods and Results—Data were analyzed for 900 randomized patients with an ejection fraction 35% and an abnormal signal-averaged ECG. Single-variable and stepwise multiple logistic regression analyses were used for mortality and length-of-stay (LOS) data. Severity of CHF and angina was graded by the New York Heart Association (NYHA) and Canadian Cardiovascular Society (CCS) classifications, respectively. Perioperative mortality was 3.5% in 454 patients without clinical signs of heart failure versus 7.7% in 443 patients with NYHA class I to IV heart failure (P=0.018). By multiple logistic regression analysis, mortality was significantly higher in patients with preoperative symptomatic (NYHA class I to IV) heart failure (odds ratio, 2.4; P=0.01) or reoperation (odds ratio, 3.8; P<0.0001). Mortality was not significantly influenced by age, sex, the presence or severity of angina, hypertension, left main coronary artery disease, pulmonary disease, or severity of CHF (although LOS was increased 0.7 days per NYHA class). Patients with a history of stroke had a higher rate of perioperative stroke (16.4% versus 3.6%, P=0.001) and an increased LOS (by 3.5 days).

Conclusions—Symptomatic heart failure and reoperation are predictors of increased operative mortality in patients with ventricular dysfunction and a positive signal-averaged ECG. Conversely, patients without heart failure symptoms may undergo CABG with relatively low mortality despite low ejection fraction. LOS is prolonged significantly by advanced age, history of stroke, and the presence and severity of heart failure.

Key Words: heart failure • angina • mortality • coronary artery bypass surgery