A stroke occurs when the blood supply in the brain is compromised by either a clogged artery (ischemic stroke) or burst artery (hemorrhagic stroke). This occurrence deprives a part of the brain of oxygen, thereby damaging some brain cells. The body and mental functions controlled by those brain cells are affected after that. (You might hear a stroke called a CVA, which stands for a cerebrovascular accident.)
The breakdown of types of strokes, using medical terms:
2-a. subarachnoid hemorrhage (an aneurysm)
2-b. intracerebral hemorrhage
These four types are true strokes, not mini-strokes or TIAs (transient ischemic attacks). A TIA is a brief interruption of blood flow to the brain, which may cause temporary stroke-like symptoms but does not damage brain cells or cause permanent disability. See What Is a TIA and Mini-Stroke Recovery.
The types of strokes are usually classified by what caused the stroke in a first place.
There are 2 main types of strokes:
1. Those caused by some kind of BLOCKAGE (called ischemic strokes). Nearly 80% of all strokes are ischemic.
|a stationary clot caused by plaque|
There are 2 sub-types of blockages:
1-A: When blood flow to the brain becomes trapped and blocked by plaque on the mall on an artery (thrombosis).
1-B: When a blood clot forms in the heart and travels into an artery in the brain, blocking blood flow (an embolism).
|caused by a travelling clot|
2. Those caused by some kind of BLEED (called hemorrhagic strokes). Nearly 20% of all strokes are hemorrhagic.
There are 2 sub-types of bleeds:
2-A: When an aneurysm (a bulge of an artery wall) ruptures outside the brain, causing a build-up of damaging pressure (subarachnoid hemorrhage).
2-B: When a blood vessel within the brain ruptures, causing rapidly increasing pressure (intracerebral hemorrhage).
|Bleeds can come from outside or within the brain|
- Left-brain vs. Right-brain strokes
- Right Hemisphere strokes
- Left Hemisphere strokes
- Bilateral strokes
- Lacunar strokes
- Thalamic strokes
- Pontine strokes
- Brain Stem strokes
- Motor Cortex strokes
- Basal Ganglia strokes
- Internal Capsule strokes
- 9 Major Areas of the Brain Affected by Stroke
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