Subarachnoid haemorrhage (SAH) is bleeding into the subarachnoid space, usually from a ruptured intracranial aneurysm (85 percent), presenting with a sudden, severe 'thunderclap' headache peaking within an hour of onset — often described as 'the worst headache of my life' — with neck stiffness, photophobia, nausea, vomiting, altered consciousness and sometimes seizures. Full topic, figures, and citations: https://medvellum.com/topics/subarachnoid-haemorrhage Chapters 00:00 The one-line answer 01:26 Meet the patient 02:10 Red flags 02:49 Classification — cause, site, and severity 05:00 Why th…
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