I believe he/she should discuss this with the cardiologist. There is no way anyone on this site can even begin to guess the severity of his/her condition or the level of activity he/she can tolerate. Ischemic heart disease is a serious problem caused by inadequate circulation of blood to the heart muscle. Blood flow to the heart is blocked by obstructions of heart arteries by cholesterol deposits. Ischemic heart disease is the underlying disorder for sudden episodes such as heart attack and sudden death as well as the chronic condition of angina pectoris. Ischemic heart disease is also called coronary artery disease or coronary heart disease.