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- $Title{Myocardial Infarction}
-
- A Medical Times Patient Education Chart
- (C) Romaine Pierson Publishers, Inc.
-
- ------------------------------------------------------------------------------
-
- Myocardial Infarction-I
-
- What is a Myocardial Infarction? The word infarct means an area of tissue
- necrosis (death) due to significant interference with blood flow, nearly
- always the result of occlusion (blockage) of the supplying artery.
- Myocardium is the name for the muscular tissue of the heart. It is the
- contraction (systole) and relaxation (diastole) of the myocardium that
- comprises the heart beat.
- Thus a myocardial infarction means the death of a portion of the muscle
- tissue of the heart.
- If the blood supply is blocked in a large vessel, a large area of muscle
- can be affected (a so-called "massive heart attack"). If a small artery is
- blocked, the area affected will be small, and thus the attack will be a minor
- "heart attack." (The arterial system of the heart is illustrated below.)
- Blockage of the artery usually is due to arteriosclerosis (narrowing of
- the vessel by the buildup of plaque--see inset). This is similar to the
- narrowing of a water pipe from mineral deposits. The narrowing is not,
- however, uniform throughout the artery.
- See the following page for the areas of infarction produced by blockage
- of various arteries.
-