Family stroke sex
(Brain cells need blood to supply oxygen and nutrients and to remove waste products.) Depending on the region of the brain affected, a stroke can cause paralysis, loss of vision, speech impairment, memory loss and reasoning ability, coma, or death.The effects of a stroke are determined by how much damage occurs, and which portion of the brain is affected.About a third of all strokes are preceded by transient ischemic attacks (TIAs or mini-strokes, that temporarily interrupt blood flow to the brain.While TIAs cause similar symptoms (such as sudden vision loss or temporary weakness in a limb they abate much more quickly than full-fledged strokes, usually within a few hours sometimes as quickly as a few minutes.Stroke is a medical emergency requiring immediate treatment.Prompt treatment improves the chances of survival and increases the degree of recovery that may be expected.
A person who may have suffered a stroke should be seen in a hospital emergency room without delay.Treatment to break up a blood clot, the major cause of stroke, must begin within three hours of the stroke to be most effective.Improved medical treatment of all types of stroke has resulted in a dramatic decline in death rates in recent decades.In 1950 nine in ten stroke victims died, compared to slightly less than one in three today.Causes, there are four main types of stroke: cerebral thrombosis, cerebral embolism, subarachnoid hemorrhage, and intracerebral hemorrhage.Cerebral thrombosis and cerebral embolism, known as ischemic strokes, are caused by blood clots that block an artery supplying the brain, either in the brain itself or in the neck.
They account for 7080 of all strokes.Subarachnoid hemorrhage and intracerebral hemorrhage are hemorrhagic strokes that occur when a blood vessel bursts around or in the brain, either from trauma or excess internal pressure.Hypertension (high blood pressure) and atherosclerosis are usually contributing factors in these types of strokes.
Cerebral thrombosis, the most common type of stroke, occurs when a blood clot, or thrombus, forms within the brain itself, blocking blood flow through the affected vessel.This is usually due to atherosclerosis (hardening) of brain arteries, caused by a buildup of fatty deposits inside the blood vessels.Cerebral thrombosis occurs most often at night or early in the morning, and is often preceded by a TIA.Recognizing the occurrence of a TIA, and seeking immediate treatment, is an important step in stroke prevention.Cerebral embolism occurs when a blood clot from elsewhere in the circulatory system breaks free.If it becomes lodged in an artery supplying the brain, either in the brain or in the neck, it can cause a stroke.