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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.
Demand ischemia is another type of heart attack for which blockages in the arteries may not be present. It occurs when a patientâs heart needs more oxygen than is available in the bodyâs supply. It may occur in patients with infection, anemia, or tachyarrhythmias (abnormally fast heart rates).