Coronary Artery Bypass Grafting(CABG) The Human Heart This is a four-chambered muscular organ, shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline. The heart is located between the lungs, in the middle compartment of the chest. This pumps blood through the blood vessels of the circulatory system. Blood provides the body with oxygen and nutrients, as well as assisting in the removal of metabolic wastes. Coronary Heart Disease & Symptoms Coronary heart disease (CHD) is a narrowing of the blood vessels that supply blood and oxygen to the heart. The most common symptom of coronary artery disease is angina, or chest pain. Angina can be described as a discomfort, heaviness, pressure, aching, burning, fullness, squeezing, or painful feeling in your chest. It can be mistaken for indigestion or heartburn. Angina may also be felt in the shoulders, arms, neck, throat, jaw, or back. Some other symptoms of coronary artery disea...