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The brain requires a constant supply of oxygen and nutrients to function.
A stroke occurs when the blood supply to the brain either is blocked or
bursts. This disruption deprives your brain of the oxygen and nutrients
necessary to function. This causes the brain cells to die. A stroke can
affect different parts of the brain so that area may not function as well
as it did before resulting in speech problems, ambulation, as well as
sensory functions such as sight and feeling.
There are several different types of strokes:
- Hemorrhagic Stroke
- Transient Ischemic
Ischemic Stroke: This type of stroke is the most common. It occurs when a blood clot blocks
an artery cutting off the blood to a part of the brain. Unless nearby
blood vessels can deliver enough blood to the area, the brain cells will
begin to die and the individual will begin to have problems using certain
parts of their body or lose some ability. There are two types of Ischemic Stroke:
Embolic – this is where a blood clot forms somewhere in the body and moves
through the blood stream into the brain. Once in the brain the clot blocks
a blood vessel and causes a stroke.
Thrombotic – this is where a blood clot forms somewhere in the body and does
not move to the brain but forms in an artery that supplies blood to the
brain. If the clot interrupts the blood flow to the brain, a stroke can occur.
Hemorrhagic Stroke: This type of stroke is caused when a blood vessel in the brain bursts
or leaks and releases blood into the brain. High blood pressure and brain
aneurysms can cause blood vessels to weaken and possibly cause a hemorrhagic
stroke. A hemorrhagic stroke can be categorized in two ways:
Intracerebral hemorrhage - In this type of stroke, a blood vessel in the brain bursts and spills
into the surrounding brain tissue, damaging brain cells. Brain cells beyond
the leak are deprived of blood and damaged. This type of stroke can be
caused by a blood vessel in the brain bursting and blood being spilled
into the surrounding brain tissue. This can be cause by a number of things
like high blood pressure, trauma or a possible malformation of the brain.
- In this type stroke, an artery on or near the surface of your brain bursts
and spills into the space between the surface of your brain and your skull.
This is often signaled by a sudden, severe headache. A subarachnoid hemorrhage
is commonly caused by the rupture of an aneurysm.
Transient Ischemic Stroke (TIA): This occurs when an artery leading to or inside the brain becomes blocked
for a short period of time. This is considered a mini-stroke and may cause
a short period of numbness, trouble with speech, balance or coordination.
Even though this may only last for less than a five minute period, you
should still seek medical attention as this may be a sign of future strokes.
There are different risk factors and symptoms of strokes. Many of the risk
factors can be treated. Factors such as smoking, high blood pressure,
high cholesterol, diabetes, obesity, heavy drinking, drug use and many
other factors can contribute to the risk of a stroke. Talk to your doctor
or one of our experts about these and other factors.
Symptoms of a stroke can vary depending on what type of stroke it is and
what part of the brain is affected. The following signs or symptoms should
be reported to your physician and the duration they last should be documented.
- Paralysis in the face, arm or leg.
- Trouble walking
- Trouble speaking or understanding
- Trouble with vision in one or both eyes (blurred or blackened vision)
- Sudden severe unexplained headaches accompanied by nausea or vomiting
A stroke should be diagnosed by an emergency team or an experienced physician.
The type of stroke will need to be evaluated to determine the best treatment
option. They will perform various tests in order to rule out other possible
conditions. A complete medical history is necessary to determine whether
family members have a history of stroke. A full physical examination must
be performed to evaluate your symptoms, whether they are still present
and the duration.
You may be required to have blood tests to check for different conditions.
Other tests that may be performed are CT Scan or an MRI as well as various
other diagnostic tests used to determine whether a patient has had a stroke.