I have had 2 different procedures carried out on my heart...the first (to carry out an ablation) went in throught my groin. I was awake and it did not hurt at all...oh except when they zapped my heart a couple of times. I hade an angiogram a year later. This time they went in through my wrist. This one was not pleasant but didn't take long so not too bad. I believe that there is a small risk but was comforted by the fact if my heart decided to argue then it could do that when I did not have fully qualified cardiac doctors and nurses around so I was in the best place! Possibly not the abswers that you need but I have had the experience...
a) It is quite natural to worry....no medical procedures are "nothing."
b) Slight risk of complications.
c) No, but they may involve the renal artery in the investigation of hypertension.
d)A dose that is not tissue damaging.
e) Yes.......many people....including sqad.
So , it sounds as if it is being carried out , because high blood pressure can have an effect on the renal arteries , which carry blood from the heart to the kidneys .