Stroke, also called a cerebrovascular
accident, is a result of an injury to the brain tissue due to
disturbed blood flow supply through arteries that transport them to
the brain. Stroke is the most common cause of neurological
disability after Alzheimer's disease. While the possible causes
of decreased or obstruction of blood flow to the brain are many, the
vast majority of strokes are caused by one of the three events:
This word means a "clot". In the
case of a stroke, presence or formation of a clot (a thrombus) or plug
somewhere in the vessels of the neck or brain (cerebral thrombosis).
Atherosclerosis, the villain that causes plugging of arteries
supplying blood to the heart and thereby leads to heart attacks, also
causes the narrowing that leads to "brain attacks" or strokes.
Many of the same risk factors apply to both brain and heart attacks.
The breakage of a blood vessel in the
brain (cerebral hemorrhage) can obviously interrupt blood flow to the
part of the brain supplied by that vessel. Hemorrhagic stroke
results when there is an extensive bleeding within the brain, which
destroys or compresses and cause direct damage to the brain tissue.
Hupertension (high blood pressure) may cause damage to weakened blood
vessels, thus setting the stage for rupture to occur.
An embolus is a travelling clot or air
bubble a blood clot, that dislodges from the heart or arteries leading
to the head and is carried into the smaller arteries of the brain,
where it obstruct the arteries from carrying blood supply
smoothly to the brain. This can in turn cause a sudden brain
tissue death known as cerebral embolism.
Short-lived strokes that occur suddenly
in 2 to 30 minutes or sometimes may last up to hours, without causing
persistent or permanent damage, called as transient ischemic attacks,
can be a warning sign that a more severe stroke is to follow. We
should see this as a serious sign and consult a professional physician
for immediate actions and medications to take in order to evaluate
them before a more serious stroke condition arises.