Heres a quick read i found about that could be related to your heart. It was related to the death of Caminiti. Hope it helps:
"One, steroid use raises blood pressure," she said. "Two, it can also alter your sugar metabolism, so you have an increased risk of diabetes. Three, it makes the arteries vulnerable since, because of elevated cholesterol, you get cholesterol plaque buildup."
Steroid abuse can also cause a dangerous thickening of heart muscle called hypertrophy --- the same kind of heart-muscle enlargement seen in patients with congestive heart failure, experts warn.
"By revving the heart up with steroids, making it grow bigger, and then taking those steroids away, you end up with a heart muscle that's enlarging and then contracting. It's like putting [pitching great] Roger Clemens' arm in a sling and then telling him to pitch," explained Dr. Eric Braverman, a New York City doctor