A Diagram (IMAGE) Johns Hopkins Medicine Caption A diagram showing how kidney dialysis is conducted after an arteriovenous (AV) fistula surgery has provided access to the circulatory system. A new Johns Hopkins Medicine study reveals that many physicians are still performing a different, riskier procedure with a prosthetic graft for gaining access. Credit National Institute of Diabetes and Digestive and Kidney Diseases/National Institutes of Health Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.