I think the moral of the story should be more in the fact to not skip on cardio. I have ran stress test on a ton of people and every one that has heart problems has a relatively low aerobic capacity. It goes hand in hand, yet everyone thinks they will lose muscle if they do cardio. It just doesnt happen like that. Cardio keeps the heart healthy.

The doctor is only giving you half the story, heavy weight lifting can cause LVH. But the more likely pathological factor is increased peripheral vascular resistance. Cardio will help reduce this tremendously, the heart is only under load from weight lifting for a very brief period of time. The heart is under load from increased vascular resistance 100% of the time.

Good luck to you and hope all turns out well.

And everyone else reading this, do your cardio!!!!!!!