With care, it would be possible for your husband to heal his heart completely. Nutrition is an important part of it. The Indian diet has many characteristics that are beneficial to the heart such as the spices we use. Turmeric is a blood purifier. Red pepper prevents blood clots, and when they are eaten together the negative effects of red pepper are nullified.
Coriander lowers blood pressure.
Onion and garlic are very good in lowering blood pressure and promoting circulation too. On the other hand, the recent craze for white flour nan has harmed the Indian diet. Fiber is very good for the heart. If you don't have time to make whole wheat chapatis, one can buy them even in health food stores and just heat them at home. As far as rice is concerned, I would recommend sticking to Basmati rice.