Yoga covers a wide field from the predominantly physical like hata yoga to the purely spiritual like Kundalini yoga. Likewise, heart disease covers a whole lot of conditions like: angima, myocardial infarction, coronary artery disease, septal defects, valve defects, cardiomyopathy, arrhythmia, palpitations and more. Doing the wromg yogic practice for the wrong condition can make things worse than they are. First thing is to get a proper assessment of the cardiac condition. Then get an opinion from a yoga expert. After which get the cardiologists opinion on whether the suggested yoga is suitable. Finally, a decision based on one s own study of all info.