I’m 77 years old should I do a cardiac catheterization angiogram, need second opinion?

I am a 77 year old man with one kidney I was recently hospitalized they think that I had a silent heart attack but it’s now been 2 months I’ve been out everything is improve the doctor say by kidneys doing better my blood pressure is good my livers good everything looks like it’s improving but now they’re telling me they want to do a cardiac catheterization angiogram and I just feel like maybe it’s not necessary because I’m older and I don’t know if I should be doing that and I’m making improvements so why do I need to do that procedure