What is a buttonhole used for in dialysis?

A buttonhole is used in dialysis primarily to facilitate easy and consistent access to an arteriovenous (AV) fistula. This technique involves creating a series of small, repeated punctures in the same location of the fistula, where a healed tract or "buttonhole" develops over time. This practice not only enhances the accessibility of the fistula but also helps in minimizing the trauma to the surrounding tissue.

By using a buttonhole approach, healthcare providers can reduce the stress on the access site, which can lead to better long-term outcomes, such as prolonged use of the fistula. The technique is designed to make the needle insertion process more straightforward for dialysis sessions, thereby contributing to the overall effectiveness and comfort of treatment for patients. Additionally, since the same spot is used repeatedly, it often leads to less pain and skin damage compared to other methods of access.