TIA meaning in Medical ?

Answer:

What is Transient Ischemic Attack mean?

A transient ischemic attack (TIA), commonly known as a mini-stroke, is a brief episode of neurological dysfunction caused by loss of blood flow (ischemia) in the brain, spinal cord, or retina, without tissue death (infarction). TIAs have the same underlying mechanism as ischemic strokes. Both are caused by a disruption in blood flow to the brain, or cerebral blood flow (CBF). The definition of TIA was classically based on duration of neurological symptoms. The current widely accepted definition is called "tissue-based" because it is based on imaging, not time. The American Heart Association and the American Stroke Association (AHA/ASA) now define TIA as a brief episode of neurological dysfunction with a vascular cause, with clinical symptoms typically lasting less than one hour, and without evidence of infarction on imaging.

TIA causes the same symptoms associated with stroke, such as weakness or numbness on one side of the body. Numbness or weakness generally occur on the opposite side of the body from the affected hemisphere of the brain. A TIA may cause sudden dimming or loss of vision, difficulty speaking or understanding language, slurred speech, and confusion.

TIA and ischemic stroke share a common cause. Both result from a disruption in blood flow to the central nervous system. In ischemic stroke, symptoms generally beyond seven days. In TIA, symptoms typically resolve within one hour. The occurrence of a TIA is a risk factor for eventually having a stroke. Both are associated with increased risk of death or disability. Recognition that a TIA has occurred is an opportunity to start treatment, including medications and lifestyle changes, to prevent a stroke.

While a TIA must by definition be associated with symptoms, a stroke may be symptomatic or silent. In silent stroke, also known as silent cerebral infarct (SCI), there is permanent infarction present on imaging, but there are no immediately observable symptoms. An SCI often occurs before or after a TIA or major stroke.

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