Tag Archives: lumbar puncture

The Subarachnoid Enigma

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 …

Spinal tap following a negative CT in suspected SAH

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.