(Circulation. 1997;95:2485.)
© 1997 American Heart Association, Inc.
Articles |
Relationship Between Physician and Hospital Coronary Angioplasty Volume and Outcome in Elderly Patients
From the Outcomes Research and Assessment Group, Duke Clinical Research Institute (J.G.J., E.D.P., C.L.N., J.A.S., E.R.D., L.H.M., D.B.M.), the Department of Medicine (J.G.J., E.D.P., C.L.N., J.A.S., D.B.M.), and the Department of Surgery (L.H.M.), Duke University Medical Center, Durham, NC.
Correspondence to James G. Jollis, MD, Box 3254, Duke University Medical Center, Durham, NC 27710.
Abstract
Background With the expectation that physicians who perform larger numbers of coronary angioplasty procedures will have better outcomes, the American College of Cardiology/American Heart Association guidelines recommend minimum physician volumes of 75 procedures per year. However, there is little empirical data to support this recommendation.
Methods and Results We examined in-hospital bypass surgery and death after angioplasty according to 1992 physician and hospital Medicare procedure volume. In 1992, 6115 physicians performed angioplasty on 97 478 Medicare patients at 984 hospitals. The median numbers of procedures performed per physician and per hospital were 13 (interquartile range, 5 to 25) and 98 (interquartile range, 40 to 181), respectively. With the assumption that Medicare patients composed one half to one third of all patients undergoing angioplasty, these median values are consistent with an overall physician volume of 26 to 39 cases per year and an overall hospital volume of 196 to 294 cases per year. After adjusting for age, sex, race, acute myocardial infarction, and comorbidity, low-volume physicians were associated with higher rates of bypass surgery (P<.001) and low-volume hospitals were associated with higher rates of bypass surgery and death (P<.001). Improving outcomes were seen up to threshold values of 75 Medicare cases per physician and 200 Medicare cases per hospital.
Conclusions More than 50% of physicians and 25% of hospitals performing coronary angioplasty in 1992 were unlikely to have met the minimum volume guidelines first published in 1988, and these patients had worse outcomes. While more recent data are required to determine whether the same relationships persist after the introduction of newer technologies, this study suggests that adherence to minimum volume standards by physicians and hospitals will lead to better outcomes for elderly patients undergoing coronary angioplasty.
Key Words: angioplasty • morbidity • bypass • mortality
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