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Subarachnoid Hemorrhage
The space is that the area between the brain and therefore the skull. It is crammed with spinal fluid (CSF), which acts as a floating cushion to guard the brain (see Anatomy of the Brain). When blood is released into the subarachnoid space, it irritates the lining of the brain, increases pressure on the brain, and damages brain cells. At an equivalent time, the world of brain that previously received oxygen-rich blood from the affected artery is now bereft of blood, leading to a stroke. SAH is usually a symbol of a ruptured aneurysm. Enclosed within the rigid skull, clotted blood and fluid build-up increases pressure which will crush the brain against the bone or cause it to shift and herniate. Blockage of the traditional CSF circulation can enlarge the ventricles (hydrocephalus), causing confusion, lethargy, and loss of consciousness. Vasospasm is a common complication that may occur 5 to 10 days after SAH Irritating blood by products cause the walls of an artery to contract and spasm. Vasospasm narrows the within diameter (lumen) of the artery and thereby reduces blood flow thereto region of the brain, causing a secondary stroke.