 CHD is caused by a narrowing of the small blood vessels that supply blood and oxygen to the heart. It usually results from atherosclerosis, a condition in which deposits of fat, cholesterol, and other substances build up along the inner walls of arteries. Risk factors for CHD include tobacco use, high blood pressure, diabetes, and obesity. Visceral fat, the type of fat found in the abdomen and surrounding vital organs, is considered a greater risk factor for CHD than subcutaneous fat, the type of fat found directly below the skin. Pericardial fat, the fat surrounding the heart, is similar to visceral fat, and may be particularly damaging because of its lipotoxicity effects and its ability to trigger inflammation in the coronary arteries. Increased amounts of pericardial fat may therefore accelerate the development of atherosclerosis and CHD. The purpose of this study is to evaluate the relationship between pericardial fat and the development of CHD. 