(Circulation. 1996;94:390-397.)
© 1996 American Heart Association, Inc.
Articles |
Predictors of Atrial Fibrillation After Coronary Artery Surgery
Current Trends and Impact on Hospital Resources
the Division of Cardiac Surgery (S.F.A., D.P.S., D.H.A., R.J.R., G.S.C., J.J.C., L.H.C.), Department of Surgery, Brigham and Women's Hospital; and the Division of General Medicine (H.R.B., M.V.V.), Department of Medicine, Harvard Medical School, Boston, Mass.
Correspondence to Sary F. Aranki, MD, Division of Cardiac Surgery, Brigham and Women's Hospital, 75 Francis St, Boston, MA 02115.
Background Atrial fibrillation (AF) after coronary artery bypass surgery (CABG) is the most common sustained arrhythmia. Its pathophysiology is unclear, and its prevention and management remain suboptimal. The aim of this prospective study was to determine the current incidence of AF, identify its clinical predictors, and examine its impact on resource utilization.
Methods and Results Over a 12-month period ending July 31, 1994, a CABG procedure was performed on 570 consecutive patients (age range, 32 to 87 years; median age, 67 years; 232 [41%] were 
70 years; 175 [31%] were women; 173 [30%] were diabetics; 364 [65%] required nonelective surgery; 86 [15%] had had a prior CABG; and 86 [15%] had had prior percutaneous transluminal coronary angioplasty). AF occurred in 189 patients (33%). The median age for patients with AF was 71 years compared with 66 for patients without (P=.0001). Multivariate logistic regression analysis (odds ratio, ±95% CI, P value) was used to identify the following independent predictors of postoperative AF: increasing age (age 70 to 80 years [OR=2; CI, 1.3 to 3; P=.002], age >80 years [OR=3; CI, 1.6 to 5.8; P=.0007]), male gender (OR=1.7; CI, 1.1 to 2.7; P=.01), hypertension (OR=1.6; CI, 1.0 to 2.3; P=.03), need for an intraoperative intra-aortic balloon pump (OR=3.5; CI, 1.2 to 10.9; P=.03), postoperative pneumonia (OR=3.9; CI, 1.3 to 11.5; P=.01), ventilation for >24 hours (OR=2; CI, 1.3 to 3.2; P=.003), and return to the intensive care unit (OR=3.2; CI, 1.1 to 8.8; P=.03). The mean length of hospital stay after surgery was 15.3±28.6 days for patients with AF compared with 9.3±19.6 days for patients without AF (P=.001). The adjusted length of hospital stay attributable to AF was 4.9 days, corresponding to $10 055 in hospital charges.
Conclusions AF remains the most common complication after CABG and consequently is a drain on hospital resources. Concerted efforts to reduce the incidence of AF and the associated increased length of stay would result in substantial cost savings and decrease patient morbidity.
Key Words: atrial flutter • atrial fibrillation • coronary disease • bypass surgery
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