Where do I cannulate?

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I'm not a new nurse but I'm new to dialysis. It's the one thing I do not understand and I've asked my preceptor for advice but not getting a clear answer.

I understand AV graft and fistula, and how to assess them. What I don't get is where to cannulate the access? Is it where I feel the thrill?

My preceptor told me to follow the track marks but it's not always obvious. I notice that when others cannulate the access site, they usually go where there is bumpy areas. But from what I've learned it's not the best place to cannulate. Any advice?

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