Have a look at this...
Anabolic Steroids, Growth Hormone, and Hypertrophy of the Heart
The study suggests that:
* Just like the Australians proved before, steroids are not as disastrous for the heart morphology as some agencies want you to believe;
* The combination with growth hormone does however add considerable cardiovascular risks to steroid cycles;
* The deleterious effects wear off during wash out periods.
It also suggests that grwoth hormone use was associated with enlargement of the left ventricular mass – the part of the heart that pumps oxygenated blood through the body to a significant degree.