Nandrolone has been found to cause changes in heart muscle structure and electrical activity. I have some npp in my drawer that I'm tempted to use, but I think for now i'll stick with test.
Long term use of steroids does have health consequences for the heart. Which increases as you get older.
But life is always a matter of trade offs. Should your life just revolved around security and safety? Seems like there are some risks to everything we do. I mean, even weight training takes it's toll. My brother, and we were born in the same year and the closest thing I have to a clone has zero joint problems. I'm a mess (knees, elbows, shoulders, neck, back) always in some kind of pain. He has blood pressure issues and I do not and I've been on TRT since 1999 and mess with steroids off and on throughout my twenties. So you are talking decades of some kind of use.
My quality of life is vastly improve because I take 200mg/wk of Test and 300mg/wk of EQ. I am able to do things physically that my brother can't do. But I know I am eventually going to die of a heart attack as everyone in my family does. But right now I'm the only one that doesn't have heart and BP issues and all but one of my brothers are younger than me (three younger, one older) so I'm ahead of the game despite my steroid use though I do have an enlarged heart and a thickening of the left ventricle.
So I'm making that trade off of quality of life now and maybe losing some years off my life.
http://www.ergo-log.com/nandrotest.html