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MediumNeurologySubarachnoid Haemorrhageukmlamrcp part 1mrcem sbapaneprescribing safety assessment

A 40-year-old man with no significant past medical history presents with sudden onset severe 'thunderclap' headache, which reached maximal intensity within seconds. He also experienced vomiting. His neurological examination is currently normal. What is the most important initial investigation to exclude subarachnoid haemorrhage?

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