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Heart Disease - Diseases of the Coronary Arteries
The Heart muscle or
is supplied by a number of medium sized arteries that take oxygen-bearing blood to the working muscle. These vessels are known as the
. Various abnormalities may cause narrowing of the vessels sufficient to reduce the blood flow to the point at which, symptoms develop. Referred to as coronary artery diseases, these abnormal conditions then give rise to
Ischemic Heart Disease
There are two basic types.
In one type, the blood flow may be reduced to a level at which the oxygen demands of the working muscle exceed the available supply. The set of symptoms that most commonly arise in this situation is called
In the other type, the blood flow may be practically entirely blocked off by a clot or
forming in the vessel. In this case, the segment of the myocardium, which is supplied by this particular vessel, dies from lack of blood supply. The consequence is more serious and often catastrophic. This is an
Acute Myocardial Infarction
, and is generally what is meant by the term “Heart Attack”.