- Subarachnoid haemorrhage (SAH) is the presence of blood in the subarachnoid space, between the pia and arachnoid dural membranes
- Approximately 5% of all cerebrovascular events in the United Kingdom are the result of a SAH
- Symptoms and signs include the classical ‘thunderclap’ headache, focal neurological signs, reduced GCS, and signs of meningism
- It is associated with a high disability rate and mortality
