Ep 194 Subarachnoid Hemorrhage – Recognition, Workup and Diagnosis Deep Dive
Emergency Medicine Cases
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Considerations for Post-Negative Plain CT Decision
Considerations for deciding what to do after a negative plain CT scan post-six hours include: 1) CTA effectively rules out subarachnoid hemorrhage; 2) The post-test probability of subarachnoid hemorrhage is less than 1% with a negative CTA after a negative non-contrast head CT; 3) There is a 25% risk of post-LP headache, treatable with caffeine and spinal patch; 4) Traumatic taps occur in 10 to 30% of patients based on CSF red cell cutoff.
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