The Frequent Hemodialysis Study is one of a number of recent studies that showed an increase in access problems and infections among the more frequent dialyzers and thus people using the buttonhole technique. There have been a couple others too BUT I think in every instance I've looked into - gotten the paper and read the details - it was either in a situation where it was incenter with staff cannulating or a technique failure was identified e.g sticking the the needle in up to the hosel, picking the scabs with the same needle, not cleaning the area before removing the scabs. The studies I've seen that looked at self cannulators using the buttonhole showed improved outcomes.
Rain I know exactly what you're talking about. I have a strong, shallow fistula. I've been self cannulating since January 1991, sharps first then buttonhole needles but I did buttonhole with sharps before Medisystems came out with their dull needles. I think they came out in 2002 or 2003 and I started buttonholing n 2001 when I switched to more frequent dialysis.
When I have to use sharps to establish new buttonholes I can get sprayed, it's not pleasant. As a practical matter you could use a 4x4 gauze pad as barrier. That's not to say that a barrier is an ideal solution, the spray can and will find the gaps that you leave to see what you're doing but it helps.
A shallow entry angle seems to increase spray. I have a tendency with sharps to make the angle more like 30% instead of 40 to 45%. I visualize the needle entering the fistula only as far as getting the hole past the skin, keeping the needle at as steep an angle as I can stand and then decrease the needle to thread the rest of the way in.
Visualize putting in the needle at a steeper angle, just the short distance of the tip, pausing, and then decreasing the angle before finishing. You can get through this; it is worth getting to the other side. Meinuk coined the term "
a Carrie Moment", we've all had them but it is still better doing it yourself than having someone do it to you.