Archive

Tag: SAH

The Ottawa SAH Clinical Decision Rule

Background: Headache is a common presentation to the emergency department  (ED) accounting for 2% of all visits [1].  Of the patients that present with headache,1 – 3% will be due to a subarachnoid hemorrhage (SAH) [1]. SAH is a true diagnostic …

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Neurology

REBEL Cast Episode 21: Sensitivity of Early Brain CT to Exclude Aneurysmal Subarachnoid Hemorrhage

Background: Headache accounts for approximately 2% of all ED visits. One of the most serious etiologies of headache is aneurysmal subarachnoid hemorrhage (SAH), which accounts for 4 – 12% of ED patients with thunderclap headache. There have been several studies …

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Neurology

Xanthochromia Detection: Visual Inspection vs. Spectrophotometry

Background: Although non-contrast head CT (NCHCT) has near perfect sensitivity (98-100%) in detecting aneurysmal subarachnoid hemorrhage (SAH) when performed within 6 hours of headache onset, sensitivity declines after 6 hours. As a result of declining sensitivity, lumbar puncture (LP) continues …

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Neurology

Does a Normal Head CT Within 6 Hours of Onset of Headache Rule Out SAH?

Background: The traditional standard workup for ruling out subarachnoid hemorrhage (SAH) has been a non-contrast head CT and, if negative, a lumbar puncture. The thought behind this is that the sensitivity of head CT to rule out SAH is not …

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Neurology

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