< b>Hemorrhage, subarachnoid: Bleeding within the head into the space between
two membranes that surround the brain. The bleeding is beneath the arachnoid membrane
and just above the pia mater. (The arachnoid is the middle of three membranes around
the brain while the pia mater is the innermost one.)
The subarachnoid space is a potential space. It is normally filled with cerebrospinal
fluid. With a subarachnoid bleed, the cerebrospinal fluid in the subarachnoid space
is bloody.
Subarachnoid hemorrhages are typically acute (sudden). They may follow a head
injury or rupture of a blood vessel in the central nervous system (brain and spinal
cord) as, for example, because of an aneurysm in the vessel.
Nearly half of people admitted to a hospital with a subarachnoid hemorrhage die
within a month. Many of the survivors are left with severe disabilities.
The first-degree relatives of patients with subarachnoid hemorrhage are more
likely to develop the condition than those who do not have a family history of it.
Smoking, alcohol abuse, and high blood pressure are risk factors for subarachnoid
hemorrhage.
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