Stroke Therapy: Causes of Stroke ins and outs

Stroke Therapy: Causes of Stroke ins and outs
On Hemorrhagic stroke (stroke with bleeding), broken blood vessels thereby inhibiting the normal flow of blood and blood seeped into an area in the brain and damage it. Nearly 70 percent of cases of hemorrhagic strokes occur in people with hypertension.
In ischemic stroke (stroke without bleeding), blockage can occur along the path of the arteries leading to the brain. Blood to the brain is supplied by two internal carotid arteries and two vertebral arteries. These arteries are branches of the aortic arch of the heart.
An atheroma (fatty deposits) can form in the carotid arteries causing reduced blood flow. The situation is very serious because all the blood vessels in normal carotid arteries deliver blood to most of the brain. Fatty deposits can also be detached from the walls of arteries and flow in the blood, clogging arteries and smaller.
Carotid arteries and vertebral arteries and their branches could also be blocked because of a blood clot from elsewhere, for example, from the heart or the single valve. This kind of stroke called a cerebral embolism (embolism = occlusion, cerebral = brain blood vessels), which most often occurs in patients who had undergone cardiac surgery and patients with heart valve abnormalities or heart rhythm disturbances (especially atria fibrillation).
Fat emboli rarely cause stroke. Fat embolism is formed when fat from a ruptured spinal released into the bloodstream and eventually joined in an artery.
Stroke can also occur when an infection causes inflammation or constriction of blood vessels leading to the brain. Drugs (egg cocaine and amphetamines) also may narrow the blood vessels in the brain and cause stroke.
Decrease in blood pressure could suddenly lead to reduced blood flow to the brain, which usually causes a person to faint. Stroke can occur if blood pressure is very severe and chronic lower. This occurs when a person experiences a lot of blood loss due to injury or surgery, heart attack or abnormal heart rhythms.