Other risk factors, such as your age, family history, and race and ethnicity, cannot be changed. This system is a network of blood vessels, such as arteries, veins, and capillaries, that carries blood to and from all areas of your body. · your heart is in the center of your chest, near your lungs. Your heart is at the center of your circulatory system. It is also sometimes called coronary artery disease or ischemic heart disease. · coronary artery disease, other heart problems and previous heart surgery. It causes the heart to have a harder time pumping blood to the rest of the body, which can lead to symptoms of heart failure. · cardiomyopathy (kahr-dee-o-my-op-uh-thee) is a disease of the heart muscle. Narrowed heart arteries, a heart attack, heart valve disease, prior heart surgery, heart failure, cardiomyopathy and other heart damage are risk factors for almost any kind of arrhythmia. Your hearts electrical system determines how fast your heart beats. This buildup is called plaque. It is made up of multiple layers of tissue. · symptoms of heart disease in the blood vessels coronary artery disease is a common heart condition that affects the major blood vessels that supply the heart muscle. · the heart is an organ about the size of your fist that pumps blood through your body. Some risk factors — such as high blood pressure and unhealthy cholesterol levels can be adjusted through heart-healthy lifestyle changes. It has four hollow chambers surrounded by muscle and other heart tissue. · oxygen-poor blood from the body enters your heart through two large veins called the superior and inferior vena cava. The blood enters the hearts right atrium and is pumped to your right ventricle, which in turn pumps the blood to your lungs. This online evidence based resource will help guide you how to measure the qt interval and calculate the qtc value with an easy to use calculator which takes into account the patients underlying rhythm, gender and age. · coronary heart disease is a type of heart disease that occurs when the arteries of the heart cannot deliver enough oxygen -rich blood to the heart muscle due to narrowing from the buildup of fatty deposits called plaque. A buildup of fats, cholesterol and other substances in and on the artery walls usually causes coronary artery disease. Your blood carries the oxygen and nutrients that … The chambers are separated by heart valves, which make sure that the blood keeps flowing in the right direction. Worried about qt interval prolongation? · your risk of coronary heart disease increases based on the number of risk factors you have and how serious they are. · your heartbeat is the contraction of your heart to pump blood to your lungs and the rest of your body. Anatomy of the interior of the heart.