Subarachnoid hemorrhage
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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intracranial hemorrhage into the subarachnoid space; the most common cause is rupture of an aneurysm.

Medical dictionary. 2011.

Look at other dictionaries:

  • Subarachnoid hemorrhage — ICD9|852.0 ICD9|852.1 ICDO = OMIM = 105800 MedlinePlus = 000701 eMedicineSubj = med eMedicineTopic = 2883 eMedicine mult = eMedicine2|neuro|357 eMedicine2|emerg|559 MeshID = D013345 Subarachnoid hemorrhage (SAH, pron en|ˌsʌbəˈræknɔɪd ˈhɛm(ə)rɪdʒ) …   Wikipedia

  • subarachnoid hemorrhage — n. (Medicine) hemorrhage inside the head into the space between two membranes that encompass the brain …   English contemporary dictionary

  • subarachnoid — [sub΄ə rak′noid΄] adj. located in the space between the arachnoid and the pia mater membranes of the brain and spinal cord, that contains the cerebrospinal fluid [a subarachnoid hemorrhage] …   English World dictionary

  • 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… …   Medical dictionary

  • Subarachnoid — Literally, beneath the arachnoid, the middle of three membranes that cover the central nervous system. In practice, subarachnoid usually refers to the space between the arachnoid and the pia mater, the innermost membrane surrounding the central… …   Medical dictionary

  • Subarachnoid space — Infobox Anatomy Name = Subarachnoid space Latin = spatium subarachnoideum, cavum subarachnoideale GraySubject = 193 GrayPage = 876 Caption = Diagrammatic representation of a section across the top of the skull, showing the membranes of the brain …   Wikipedia

  • subarachnoid — also subarachnoidal adjective Date: 1843 of, relating to, occurring, or situated under the arachnoid membrane < subarachnoid hemorrhage > …   New Collegiate Dictionary

  • Hemorrhage — Bleeding or the abnormal flow of blood. The patient may have an internal hemorrhage that is invisible or an external hemorrhage that is visible on the outside of the body. Bleeding into the spleen or liver is internal hemorrhage. Bleeding from a… …   Medical dictionary

  • Cerebral hemorrhage — Classification and external resources File:Intracerebral heamorrage Cerebral hemorrhage ICD 10 I61, P10.1 …   Wikipedia

  • Intracranial hemorrhage — ICD9|432, ICD9|850 ICD9|854 ICDO = OMIM = MedlinePlus = 000796 eMedicineSubj = neuro eMedicineTopic = 177 MeshID = D020300 An intracranial hemorrhage is a hemorrhage, or bleeding, within the skull. CausesIntracranial bleeding occurs when a blood… …   Wikipedia

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