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EMQ answers 394

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ANSWER 1

  1. True. The frequency of sentinel headaches preceding confirmed subarachnoid haemorrhage ranges widely in studies from 10–43%.1 This variability is only partly explained by recall bias. A recent review recommends that the term sentinel bleed should be abandoned: “people have either had a subarachnoid haemorrhage or not and the important task is to recognise when they have.”2

  2. False. The false negative rate is approximately 2% when performed within 12 h, increasing to 7% by 24 h. Subarachnoid blood is almost completely reabsorbed at 10 days.2

  3. False. There is currently no sound …

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  • Emergency Medicine Questions (EMQ)
    BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine