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transient ischemic attack. a sudden episode of temporary symptoms typically due to diminished blood flow through the brain, usually defined as lasting between 24 and 48 hours. It is sometimes related to impaired blood flow through the vertebrobasilar vessels.
This blood clot can block the blood flow through the heart muscle. When the heart muscle is starved for oxygen and nutrients, it is called ischemia. When damage or death of part of the heart muscle occurs as a result of ischemia, it is called a heart attack or myocardial infarction (MI).About every 43 seconds, someone in the United States has a myocardial infarction (heart attack). Your heart muscle needs oxygen to survive.hen this happens the artery narrows and blood flow to part of the heart muscle decreases or stops. We're not sure what causes a spasm. A spasm can occur in normal-appearing blood vessels as well as in vessels partly blocked by atherosclerosis.