Hi, Whenever there is increased workload on heart with low pumping capacity, pumping further decreases and heart cannot pump adequate blood out of its left lower (left ventricle) chamber and there is back pressure on left upper chamber (left atrium), lungs, and right side chambers of heart. Which causes breathing difficulty (due to pulmonary oedema- fluid collection in lungs) and there is impaired gas (oxygen and carbondioxide) exchange in lung and there is retention of carbondioxide in blood blood. So main treatment of in such person is 1) To prevent further decrese in heart pumping - prevent further heart attack. 2) To prevent workload on heart. Avoid undue exertion, short term illnesses. So it is advisable 1) Restrict daily water intake to 1 liter. 2) Use of diuretics like Lasix which help in removing extra water from blood and keeps lungs free of water. 3) Continue blood thinning medicines that helps in prevention of future heart attack. 4) use of Medicine like Beta blocker, ACE inhibitors or ARBs that help in maintaining the pumping capacity of heart. 5) Regular check of blood pressure and keep it under control. 6) Regular check for lipid level and keep it under control using statins. 7) Diabetes control if present with medicines that can be used with low pumping capacity of heart, insulin is preferred. 8) Avoid smoking, alcohol. 9) Vaccination with pneumonia and flue vaccination that prevent frequent respiratory infections. 10) Avoid undue exertion. 11) Revascularisation of heart blood vessels which are at risk (this can be known from coronary angiography report) this help in preventing heart attacks. I think this is enough information. If you find it helpful then please do vote.