Six hours means so much when it comes to subarachnoid hemorrhage. That is the inflection point when blood may no longer look like fresh blood on a CT. Several studies have shown that a negative ct done within 6 hours of headache onset effectively excludes clinically significant bleeding (extrapolated to mean aneurysmal subarachnoid hemorrhage). Of course …
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Explain it: What is the sensitivity of CT scanning for subarachnoid hemorrhage when performed within 6 hours of headache onset?
A review of current guidelines and controversies in the evaluation of fever in neonates and infants under 90 days age.
It’s deeply rooted medical dogma that spinal tap needs to follow a negative CT when evaluating patients for subarachnoid hemorrhage. New literature has come out to challenge that idea. We talk with Scott Weingart of emcrit.org and Ryan Radecki of Emergency Medicine Literature of Note about a 2011 BMJ paper that looks at the sensitivity of computed tomography when performed within 6 hours of headache onset.