Myocardial Ischemia  Myocardial ischemia (also known as angina)
is a heart condition caused by a temporary lack of oxygen-rich
blood to the heart. There are three types, each of which is
signified by pain. The stable type occurs when the heart is
working harder than usual and generally goes away with rest;
unstable myocardial ischemia is dangerous and requires emergency
treatment; variant (also called Prinzmetal's angina) occurs at
rest and can be relieved by medicine.  What Is Myocardial
Ischemia?  More than 6 million Americans live with myocardial
ischemia, or angina. The term refers to chest pain or discomfort
that occurs when the heart muscle is not getting enough oxygen-
rich blood for a short period of time. The inadequate blood flow
is caused by narrowed coronary arteries, which are the vessels
that supply blood to the heart. A bout of myocardial ischemia is
not a heart attack, but it means that you're more likely to have
a heart attack than someone who doesn't have myocardial
ischemia.  Understanding t