Myocardium
The muscular wall of the heart. It contracts to pump blood out of the heart and then relaxes as the heart refills with returning blood.
Cardiac
Myocardial Ischemia
Occurs when a part of the heart muscle does not receive enough oxygen
Murmur
Noises superimposed on normal heart sounds. They are caused by congenital defects or damaged heart valves that do not close properly and allow blood to leak back into the chamber from which it has come.