I stumbled across this and I found it very informative. I had a heart attack mid cycle last February (500ml test-e ew). No blockages were found nor real health related causes got it were found either. The cardiologist said my blood was pumping slow like molasses. Turns out that polycythemia is a condition that can be caused by high level steroid use and its symptoms are exactly the same as what I experienced which lead to what they called a "minor heart attack". My cardiologist told me that my testosterone use was not likely the contributor yet I find this evidence that proves otherwise and describes my symptoms to a T, and that the likely cause may have been this condition completely overlooked by my cardiologist. Anyway, there is alot of good info this guy writes to look into if you have any heart issues or other concerns related to your TRT or bodybuilding steroid use.
http://thinksteroids.com/articles/monitoring-testosterone-replacement-therapy/
http://thinksteroids.com/articles/monitoring-testosterone-replacement-therapy/