Because of myocardial infarction your uncles heart has become weak as compared to normal humans, the main problem is its inability to maintain normal fluid balance, medical management is what I would help you. Fluid restriction less than 1 lt a day max Low salt Drugs like beta blockers, eg. Carvedilol, metoprol, ace inhibitors like ramipril, diuretic furosemide with aldactone, statin, aspirin may be titrated as per his bp(which is low) heart rate and other vitals Digoxin may be considered Lastly look for dyssynchrony, if present CRT, dual pacemaker like think may help improve pumping Sir the question you asked required detailed discussion after reviewing all available reports and treatment he is already. For further information email Priyankmody86@gmail.com