I had one many years ago. It wasn't painful and nowhere near as bad as I feared. The only hicup I had was at the end when they lifted me from the treatment couch back to my ward bed....the tube snagged and got yanked from my groin. It took some time to stop the bleeding but it was no big deal. I believe they no longer use an artery in the groin to insert the catheter but somewhere in the arm instead.
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