Monday, September 14, 2009

Secondary AV Fistulas

Since I'm presently trying to make it through the most recent ish of NephSAP--their first-ever issue of "Interventional Nephrology"--I'll do another access-related post.

A "secondary AV fistula" refers to a fistula created after a pre-existing graft or fistula has either outright failed or been determined to be suboptimal for continued dialysis. The creation of secondary fistulas represents an important way in which nephrologists might increase their overall percentage of patients dialyzing via AV fistula (see "Fistula First Campaign") rather than simply targeting incident CKD patients initiating dialysis.

From a terminology perspective, a "Type I secondary AV fistula" refers to when the outflow vein of a pre-existing AVF or AVG is able to be used as a target for a new "converted" AVF; the advantage of Type I AVFs are that they can often be used shortly after placement, not requiring lengthy maturation times and potentially avoiding the use of a transient dialysis catheter altogether. In contrast, a "Type II secondary AV fistula" refers to an entirely new AVF, which can occur either on the ipsilateral or contralateral side with reference to the failed fistula.

How well do secondary AVF perform? In one 2002 report by Ascher et al, 71 secondary fistulas demonstrated a 1-year and 2-year primary patency rate of 58% and 22%, respectively. These results are not suprisingly worse than the primary patency rates for primary AVFs (75% and 61%, respectively), but nonetheless demonstrate that in a few dialysis patients, the creation of a secondary AVF can give successful, long-term dialysis access. Hopefully, a better understanding of the process by which AV fistula fail could eventually lead to medications or surgical breakthroughs which might prolong the longevity of secondary access attempts.

3 comments:

Dr. Roger Smith MBBS, DM. said...

Hello. I have recently started blogging on kidney disease and got your blog from the big list at bills blog. I would appreciate if you would link to my blog which is all about the treatment of kidney disease the URL is allkidney.com

I work in jamaica as a nephrologist we dont have many transplant patients so i mostly blog on dialysis and treatment of kidney disease. In fact we have a fair amount of lupus nephritis usually class IV and severe. But anyway give my blog a look and if you like it please link to me from your blog.
In fact i have a post on new drugs in lupus the information is geared more towards patient education. However I have a Journal Search and RSS section which is a work in progress. I do all of the HTML myself as i learn it anyway, started out knowing none.
you can search nephrology journals at www.allkidney.com

nathanhellman said...

Nice layout on your blog. I will post your blog as a link on my page. Happy blogging!

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