Thanks for your query.
There in no available method or medicine to increase the LVEF (ejection fraction
) of the heart but with yoga
annd walking he will be able to maintain it.The LVEF decreases with growing age,diseases like heart attack
,congestive cardiac failure..The ejection fraction of 43% if it is at present it is perfectly fine and should not cause any problem to your father.
You can discuss it in detail with your Cardiologist and he shall guide you.