From: DailyQuestion@...
Date: May 26, 2009 7:11:47 AM EDT
To: glennskow@...
Subject: EMedHome Question of the Day

The EMedHome Question of the Day is:

When performing a lumbar puncture, reinsertion of the stylet before removal of the needle has been shown to reduce the incidence of post-LP headache.  What is the explanation for this?

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The Answer is:

It is thought that a strand of arachnoid enters the needle along with the outflowing CSF; if the stylet is not replaced, the strand is threaded back through the dura during needle removal, producing prolonged CSF leakage  (JAMA, Vol. 296, pg. 2016).


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