Racial Disparities in Arteriovenous Fistula Use Among Hemodialysis Patients: The Role of Surgeon Supply

Abstract

IntroductionFactors contributing to racial disparities in arteriovenous fistula (AVF) use among hemodialysis (HD) patients remain poorly defined. We evaluated whether the Black/White race disparity in AVF use is affected by vascular access surgeon supply.MethodsUsing Consolidated Renal Operations in a Web-Enabled Network (CROWNWeb) and Medicare claims data from the US Renal Data System (USRDS), competing risk analyses of all US patients initiating HD with a central venous catheter (CVC) from 2016 to 2017 (n = 100,227) were performed. The likelihood of successful AVF use was compared between Black and White patients after adjusting for vascular access surgeon supply.ResultsCompared with the first (lowest) quartile of surgeon supply, higher supply levels were associated with modestly increased adjusted likelihoods of overall AVF use: 4% (95% CI 1.4%–7.2%), 4% (95% CI 1.4%–7.1%), and 3% (0.0%–6.1%) for second, third, and fourth quartiles, respectively. Although areas with lower surgeon supply had a higher proportion of Black patients, residing in areas with a greater surgeon supply was not significantly associated with a mitigation in racial disparity. Specifically, compared with White patients, Black patients were 10% (95% CI 7%–13%) and 8% (95% CI 5%–11%) less likely to have successful AVF use in lower and higher surgeon supply areas, respectively.ConclusionRegions with lower surgeon supply had a higher proportion of Black dialysis patients. However, racial disparities in AVF use among patients initiating HD with a CVC were similar in regions with a high and low surgeon supply. Other patient, provider, and practice factors should be evaluated toward mitigating lower rates of AVF use among Black HD patients.