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A blood clot is the most common cause of a blocked coronary artery. Usually, the artery is already partially narrowed by atheromas. An atheroma may rupture or tear, narrowing the artery further and making blockage by a clot more likely. The ruptured atheroma not only reduces the flow of blood through an artery but also releases substances that make platelets stickier, further encouraging clots to form.
Uncommonly, a Heart Attack results when a clot forms in the heart itself, breaks away, and lodges in a coronary artery. Another uncommon cause is a spasm of a coronary artery that stops blood flow. Spasms may be caused by drugs. Sometimes the cause is unknown.
Heart Attack: Myocardial Infarction (MI)
Signs and Symptoms present as pain that is crushing, tightness, squeezing, band-like, radiating, cyanosis, Sweating, cold, “clenching fist over heart”, pain in the ear, umbilicus, jaw, teeth, back, arm, hand pain (often on the ulnar side), autonomic response of vomiting, nausea or a feeling of impending doom.
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Filed under: First Aid, Injuries, Bites, Heart & Circulatory Health by Dee
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