(Circulation. 1996;93:27-33.)
© 1996 American Heart Association, Inc.
Articles |
Outmigration For Coronary Bypass Surgery in an Era of Public Dissemination of Clinical Outcomes
From the Division of Cardiology, Department of Medicine, University of South Carolina, Columbia, SC (N.A.O.), and the Departments of Cardiology (K.A., E.J.T.), Biostatistics (D.P.M.), Cardiothoracic Nursing (K.J.B.), and Thoracic and Cardiovascular Surgery (D.C., B.L., F.L.), Cleveland Clinic Foundation, Cleveland, Ohio.
Correspondence to Eric J. Topol, MD, Department of Cardiology, Desk F25, 9500 Euclid Ave, Cleveland, OH 44195.
Background Since 1989, New York State has disseminated comparative information on outcomes of coronary bypass surgery to the public. It has been suggested that this program played a significant role in the 41% decrease in the risk-adjusted mortality rate between 1989 and 1992. We hypothesized that some high-risk patients had migrated out of state for surgery.
Methods and Results We reviewed 9442 isolated coronary bypass operations performed from 1989 through 1993 to assess referral patterns of case-mix and outcome. Expected and risk-adjusted mortality rates were computed using logistic regression models derived from the Cleveland Clinic and New York State databases. A mortality comparison was performed using the 1980 to 1988 time period as a historical control. Patients from New York (n=482) had a higher frequency of prior open heart surgery (44.0%) than patients from Ohio (n=6046) (21.5%, P<.001), other states (n=1923) (37.4%, P=.008), and other countries (n=991) (17.3%, P<.001). They were also more likely to be in NYHA functional class III or IV (47.6% versus Ohio 42.7%, P=.037; other states, 41.2%, P=.011; other countries, 34.1%, P=.001). The expected mortality rate was thus higher than among other referral cohorts. The observed 5.2% mortality rate among these patients was significantly greater than the 2.9%, 3.1%, and 1.4% mortality rates observed for patients from Ohio (P=.004), other states (P=.028), and other countries (P<.001). These differences in outcome were not apparent between 1980 and 1988 among referrals from within the United States.
Conclusions Public dissemination of outcome data may have been associated with increased referral of high-risk patients from New York to an out-of-state regional medical center.
Key Words: mortality • bypass • coronary disease • surgery • revascularization
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