What is ischemia?
Ischemia is a usually temporary shortage of oxygen in a part of the body. It can occur when an artery bringing blood to that part, such as the heart, is narrowed by spasm or disease.

What is ischemic heart disease?
Ischemic heart disease includes heart attack and related heart problems caused by narrowed coronary arteries and thus less blood and oxygen reaching the heart. It's also called coronary artery disease and coronary heart disease.

What is silent ischemia?
As many as 3 to 4 million Americans may have ischemic episodes without knowing it. These people, who have ischemia without pain, have silent ischemia. They may have a heart attack with no prior warning. In addition, people with angina (chest pain) also may have undiagnosed episodes of silent ischemia. Various tests, such as an exercise test or a 24-hour portable monitor of the electrocardiogram (Holter monitor), are used to diagnose silent ischemia.

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