Background Previous studies have found that hospitals at whichmore procedures, such as coronary-artery bypass grafting (CABG)and other vascular surgery, are performed have lower rates ofmortality related to these procedures than hospitals where fewersuch procedures are performed.
Methods We examined the relation between the number of percutaneoustransluminal coronary angioplasty (PTCA) procedures performedat hospitals (volume) and short-term mortality in a populationof 217,836 Medicare beneficiaries 65 years of age or older whounderwent angioplasty in the United States from 1987 through1990.
Results The unadjusted in-hospital mortality among patientswho underwent PTCA increased from 2.5 percent among the 10 percentof patients treated in hospitals with the highest volume ofsuch procedures to 3.9 percent among the 10 percent of patientstreated in hospitals with the lowest volume. The rate of bypasssurgery after PTCA also increased, from 2.8 percent among patientsin the highest-volume hospitals to 5.3 percent among those inthe lowest-volume hospitals. Higher rates of mortality and CABGpersisted in all the groups of patients treated in hospitalsthat performed fewer than 100 angioplasty procedures per yearin Medicare beneficiaries; this volume in Medicare beneficiariescan be extrapolated to an overall annual volume of 200 to 400angioplasty procedures. In a logistic-regression model, thevolume of PTCA procedures at a hospital was found to be a highlysignificant predictor of in-hospital mortality (P<0.001).These results suggest that if the hospitals with the lowestvolume had achieved the experience and technical results ofthe highest-volume hospitals, 381 fewer patients would haveundergone CABG and there would have been 300 fewer in-hospitaldeaths in the population we studied.
Conclusions Hospitals that perform more PTCA procedures havelower short-term mortality rates after the procedure. Thesedata provide evidence in support of the regionalization of angioplastyservices.
Source Information
From the Division of Cardiology, Department of Medicine (J.G.J., E.D.P., D.B.M., S.R.C., D.B.P.), and the Division of Biometry, Department of Community and Family Medicine (E.R.D., L.H.M.), Duke University Medical Center, Durham, N.C. Presented in part at the 66th Scientific Session of the American Heart Association, Atlanta, November 10, 1993.
Address reprint requests to Dr. Jollis at Box 3254, Duke University Medical Center, Durham, NC 27708-3254.
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