| Generally, there are 2 types of strokes. Haemorrhagic stroke and Ischemic stroke. Ischemic stroke can be
subdivided into thrombotic and embolic based on the pathological mechanism. Haemorrhagic can be further subdivided
into intracerebral haemorrhage and subarachnoid haemorrhage based on the site of bleed. In the intracerebral variety, the
vesselwall ruptures and blood spills into the brain parenchyma, founding a hematoma in the brain. This can spread into the
ventricles and then to the subarachnoid space. The reason for symptoms is the pressure effect created by haematoma on the
surrounding brain tissue. Once the bleed arrests, the clot will be slowly dissolved and is absorbed over a period of time.
Verifiable in all conversations of ischemic stroke and its treatment is the presence of an "obscuration" zone that is possibly
perfused and contains practical neurons. Apparently this zone exists at the edges of localized necrosis, which at its center
has irreversibly harmed tissue that is bound to get necrotic. Utilizing different techniques, such an obscuration can be
exhibited in relationship with certain areas of localized necrosis however not all, and the level of reversible tissue harm is
difficult to decide. The neurons in the obscuration are viewed as "staggered" by moderate ischemia and subject to rescue if
blood flow is reestablished in a specific timeframe. Moreover, these agents and others have indicated that lifting the
fundamental pulse or improving the rheologic flow properties of blood in little vessels by hemodilution improves flow in
the obscuration; nonetheless, endeavors to utilize these strategies in clinical work have met with blended achievementddd |
