@strawCake - My friends dad had a cardiac catheterization done, and they did warn him of the risks. He decided the possible benefits of the procedure outweighed the risks.
However, he was getting a cardiac catheterization done as a treatment for something. This procedure is also sometimes used for medical imaging. In that case, I might opt to have a different type of imagine done knowing the risks. However, in the case of my friends father, his decision made sense.