Jg. Jollis et al., RELATIONSHIP BETWEEN PHYSICIAN AND HOSPITAL CORONARY ANGIOPLASTY VOLUME AND OUTCOME IN ELDERLY PATIENTS, Circulation, 95(11), 1997, pp. 2485-2491
Background With the expectation that physicians who perform larger num
bers 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. Metho
ds and Results We examined in-hospital bypass surgery and death after
angioplasty according to 1992 physician and hospital Medicare procedur
e volume. In 1992, 6115 physicians performed angioplasty on 97 478 Med
icare patients at 984 hospitals. The median numbers of procedures perf
ormed per physician and per hospital were 13 (interquartile range, 5 t
o 25) and 98 (interquartile range, 40 to 181), respectively. With the
assumption that Medicare patients composed one half to one third of al
l patients undergoing angioplasty, these median values are consistent
with an overall physician volume of 26 to 39 cases per year and an ove
rall hospital volume of 196 to 294 cases per year. After adjusting for
age, sex, race, acute myocardial infarction, and comorbidity, low-vol
ume physicians were associated with higher rates of bypass surgery (P<
.001) and low-volume hospitals were associated with higher rates of by
pass surgery and death (P<.001). Improving outcomes were seen up to th
reshold values of 75 Medicare cases per physician and 200 Medicare cas
es per hospital. Conclusions More than 50% of physicians and 25% of ho
spitals performing coronary angioplasty in 1992 were unlikely to have
met the minimum volume guidelines first published in 1988, and these p
atients had worse outcomes. While more recent data are required to det
ermine whether the same relationships persist after the introduction o
f newer technologies, this study suggests that adherence to minimum vo
lume standards by physicians and hospitals will lead to better outcome
s for elderly patients undergoing coronary angioplasty.