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By Vivian Ho, Douglas Wirthlin, Huifeng Yun and Jeroan Allison
Objective: To test whether availability of vascular surgeons and cardiologists in a region affects revascularization and amputation rates for patients with peripheral arterial disease (PAD).
Design and Subjects: We identified all patients with PAD in the Medicare claims data in 1994 and tracked their claims through 1999. We aggregated risk-adjusted data on the 143,202 patients who survived through 1999 by Hospital Referral Region and merged this data with information on local physician supply and other regional characteristics. Instrumental variables analysis was used to account for unobserved illness severity.
Main Outcome Measures: Risk-adjusted rates of lower extremity bypass surgery, angioplasty, and amputation by region.
Results: Increasing vascular surgeon supply in a region by approximately one standard deviation (.30 per 10,000 Medicare beneficiaries) is associated with a 1.0 percentage point increase in bypass surgery rates and a 1.4 percentage point reduction in amputation rates. We find no evidence that greater availability of cardiologists increases angioplasty rates and weak evidence that greater cardiologist supply reduces amputation rates. Factors reflecting regional attractiveness, such as the rating of a region based on climate, recreation, crime, and other attributes, were strong independent predictors of the number of vascular surgeons and cardiologists in an area.
Conclusions: Availability of vascular surgeons affects outcomes for PAD patients. Regional variability in specialists who treat PAD is influenced by factors other than regional medical needs. Policies aimed at increasing the supply of vascular surgeons and their provision of bypass surgery in underserved areas may help to reduce regional disparities in amputation.
Published in Journal of Vascular Surgery.
