Subarachnoid hemorrhage

Subarachnoid hemorrhage (SAH) is bleeding into the subarachnoid space. This space is the area between the arachnoid membrane and the pia mater, which surrounds the brain.

Symptoms may include a severe headache, vomiting, loss of consciousness, fever, and sometimes seizures. Neck stiffness or neck pain are also common. SAH causes troponin levels to rise.

Subarachnoid Hemorrhage Media

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  Circle of Willis with the most common locations of ruptured aneurysms marked

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  A lumbar puncture in progress. A large area on the back has been washed with an iodine-based disinfectant, leaving brown coloration.

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  Xanthochromia versus normal CSF

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  ECG changes resembling those of an STEMI in a woman who had an acute CNS injury from a subarachnoid hemorrhage

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  Arteriogram showing a partially coiled aneurysm (indicated by yellow arrows) of the posterior cerebral artery with a residual aneurysmal sac. The person was a 34-year-old woman initially treated for a subarachnoid hemorrhage.

• SAH incidence graph.svg

  Average number of people with SAH per 100,000 person-years, broken down by age