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Try to find a sports medicine doctor.
I have been finding that in Europe, cardiac rehab is done differently. Here in the US, it’s just 3 months of the lowest common denominator, and that’s it, take it easy for the rest of your life (just be happy with getting by). There was a study at Methodist Hospital (Houston, TX), where after the conventional rehab, some patients were taken under the wing of a cycling coach who has experience working with pro cyclists (no doping, EPO, etc). Just a basic conditioning program where after 18 months the patients would be riding the MS150 from Houston to Austin. All completed the ride. The patients were then re-evaluated, and the cardiologists were hard press to find any indication of heart damage.
The bulk of the training program was base conditioning around Zone 1/Zone 2 heart rate. Believe it or not, pro cyclist do a lot of their base training miles at this level. At that low intensity, a lot of capillarization takes place, where the increased circulation builds up muscle conditioning. Of course with the heart being a muscle, this results in a lot of tissue repair.
Keep in mind that this program was done supervised by the cardiology department at Methodist. There has been a white paper published based on this program. It has not been widely accepted mostly due to resistance in the profession.