ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY
Heart attack. Conceptual computer artwork representing a myocardial infarction, or heart attack (centre). Healthy hearts are also seen. Heart attacks occur due to the sudden death, or necrosis, of part of the heart muscle. This commonly results from a blockage in one of the coronary arteries (on the surface of the heart) that supply the muscle with blood. The most frequent cause of blockage is atherosclerosis, in which fatty plaques develop in the lumen of the arteries, restricting the blood flow. Heart attacks cause sudden severe pain in the centre of the chest, and around half are fatal within days.
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