Hello, and welcome to Healthcare Magic! Your father has had some rather abnormal test results. I will try to explain them as best I can. The human heart is essentially a muscle. Ischemic heart disease means that part of the heart muscle is receiving less blood flow than it needs. Most often this is caused by narrowing of the coronary arteries (blood vessels whose job it is to bring blood to the heart muscle). This condition is called coronary artery disease, or CAD. CAD can be caused by high cholesterol, blood pressure, smoking, diabetes, family history, and other causes. Reduced LV function means that the most important of the four chambers of the heart is not squeezing as well as it should. The ejection fraction (or EF) should be 60-65%. 47% would be considered by most cardiologists to be mildly decreased from normal, meaning he has mild systolic congestive heart failure . As for what you should do: first he needs to be regularly seen by a doctor. He can prevent further damage to his heart and even reverse some of the current damage by stopping smoking, lowering his cholesterol, losing weight, lowering his blood pressure, avoiding ilicit drugs like cocaine and methamphetamine, decreasing alcohol consumption, etc. Here is a very helpful website where you can read more about this complicated, broad topic: http://www.emedicinehealth.com/coronary_artery_disease-health/article_em.htm His doctor will recommend a number of medicines to help with the above problems. One that he can begin taking right now is a baby aspirin (81mg) daily. Aspirin helps thin the blood and keep clots from forming in the coronary arteries. If your father has a history of a stomach ulcer or blood in his stools he should wait and talk to the doctor about whether or not the aspirin is a good idea. I hope I have provided you with helpful information, and I wish you the best of health. Sincerely, Dr. Kinney