Ahhh… the fistulagram.
No, this is not when a large blood-vessel shows up at your doorstep to deliver some candy and a friendly message from a friend.
Instead, it is a procedure in which your fistula is “checked out” from the inside.
Why Do One?
Normally this test is done to see if there are any problems inside the fistula, affecting its flow. For example, perhaps there is a stenosis (narrowing) of the vessel constricting the flow. Normally this happens further up the arm, as the blood is on its way back to the heart.
So What Do They Do?
Don’t let them fool you, it’s a surgical procedure.
Not very painful, but because of the surgical surroundings, it is a tad uncomfortable. You change into the hospital gown, sign the papers (the normal ‘I/my family will not sue you if I die right now’) and head into the room. In front of you is a large table with all sorts of goodies spread out on it.
I kept thinking to myself “wait, they said this was just going to be some X-Rays of my arm with die in it!” It was - it’s just that they like to freak you out a bit with tools, assistants, blue-paper wrapping everything, and oxygen pumped into your nose. “Why are they trying to calm me down with O2″ I thought to myself. “Is this going to be more invasive than I thought?”
Well, yes, and no. It was a surgical procedure, but I would have no problem doing it again (if I absolutely had to).
The reason they set it up this way is so that they can take care of any problems they may run into right then and there (narrowing, clotting, etc.).
So basically they thread a catheter into the fistula. The needle used isn’t any bigger than what’s used during dialysis procedure - so no real discomfort there. This catheter then dispenses iodine into the vessel, which is then bombarded with x-rays. I don’t know what sort of FPS this machine was capable of, but it seemed like it was probably taking at least 5 pictures a second. So you’re sort of watching x-ray video of the inside of your arm - followed by a rush of dark liquid which you see flow through your vessels, and through the fistula.
Awesome!
Well, yeah, but it would’ve been much more intriguing if I were watching someone else’s fistulagram take place. As it was there were a lot of Our Father’s going on.
What Did They Find?
Awww - the meat of this post.
My basic beef with much of the medical community for the last nine years has been their lack of sensitivity regarding almost everything they do. Doctors have become so preoccupied with quantity of life, that they have forgotten that their goal is quality of life. So it’s not uncommon to have an entire team of physicians chasing something in you that doesn’t exist - or is posing no real problem.
This test was ordered because my KT/V value was a bit low, and my potassium was a bit high. Both out of the acceptable range, but not by a large margin. Rather than re-draw the tests, an invasive procedure seemed the logical answer. When I questioned this the answer was essentially “well, you’ve never had a fistulagram.” As in, it almost felt like “why not?”
Yes, it was explained to me that low KT/V and high potassium were definite indications of lowered blood flow through the fistula - but rather than re-draw these two simple tests, it was decided that there was no reason not to do one.
The best was being told beforehand that they didn’t think they would find anything wrong. Was that said solely to comfort me? Why the lies? Obviously you think there’s something wrong or why am I going through this in the first place?
For the most part the test went alright, until they decided to take a look at the arterial side of the fistula. The Dr. inserted a new catheter in a new site going in the opposite direction towards the arterial anastomosis. Explaining what buttonhole technique was and why they should avoid these two particular sites was hilarious.
Nurse to surgical assistant after I requested that I be able to show the Dr. where to stick:
“He needs to show the Dr. his buttons, they’re a great access.”
*me rolling eyes*
“Uh - no … ‘buttonhole technique’ is the method I use to cannulate, it’s also called constant-site tech…. you know what? never mind - the point is, he needs to be at least one inch AWAY from these sites either proximally or distally, they are NOT accesses for him to use!”
So with the new catheter threaded in and going towards my wrist, they tried to create some back flow into the artery by partially occluding the fistula and squirting in some iodine. The thinking was that without the blood pulsing through the fistula, it would back flow into the artery, at which point they would see it entering the fistula, and check for blockage.
It didn’t work.
For the next hour, they tried over and over to occlude the fistula and squirt in more iodine. For some reason they couldn’t see the radial artery, or my arterial anastomosis (point of connection between the vein and artery).
After a bit of confusion as to how my fistula must have been created, they spoke with the surgeon who created it. His first question to me: “Why are you here?”
“Good question” was my reply.
So after a couple hours of poking and prodding, two very educated doctors decided that there was really nothing to be seen on this day. Both seemed to think - “Leave well enough alone”.
The trick will be convincing my doctors that this is the best course of action. I can practically hearing them now telling me why I need an arteriogram to assure them that there’s no problem with my fistula’s in-flow.
For those non-medical types, the arteriogram is much like my fistula gram, only they feed the die in from the arterial side. Meaning that they must thread a catheter from my femoral artery (in the groin) aaaaaalll the way to my arm.
Needless to say I’m not going to be advocating for that particular test - nor will I be doing it unless there is some other evidence that it is needed.
I understand the need to catch things before they get out of hand. But are we perhaps being a bit over sensitive here?
Every time my KT/V has been lower they have wanted to do a fistulagram. For four years, I have said “No. Re-draw the lab.” And every time, the new KT/V value has been better.
Why would you use this one test if it varies so much? And why does it vary so much?
For one, time is factored into it - time dialyzed. So having a picky machine alarm all night greatly affects the accuracy of the KT/V. Or how long the tube sits in the back of the nurses station before being spun down. There are tons of factors - all of which can affect the accuracy of KT/V. Why then would you rely solely on this value?
“But your potassium was also high.”
Great, potassium - another test that’s very picky. Perhaps my potassium was high due to the extra helping of potato salad I had the night before you drew that lab? Potassium can build up VERY quickly in the blood stream, so having a slightly higher than normal potassium reading could be due to just having eaten something containing some potassium.
I should make it clear that there may indeed be a problem. I might be writing in two weeks time about my arteriogram, how painless it was, and how thankful I am we caught this so quickly.
I’m not always right (pretty much always though).
If these tests and procedures are really indicated, I have no problem going through with it.
I just can’t help but feel used on this one though. I felt it wasn’t necessary in the beginning, and now after a very uncomfortable day for my wife and I, we have no more information than we did before, and two doctors asking us why we even came in.
Forgive me if this is more venting than educational - I hope this information can help someone to ask “do I really need to do this-or-that test?”
As patients we have the right to do (or not do) whatever we feel is necessary. It is very important for you to fully understand what you’re going through, and not just follow along blindly.
Otherwise, at the end of it all you look back and realize there were many things you went through that you did not need to.
I know.