What causes a post-LP headache?
It’s a headache after a LP, presumably because of a persistent CSF leak from the puncture site.
How can you minimize the risk of a post-LP headache?
There are several techniques you can used, as summaried in a 2006 JAMA article:
1. Use an atraumatic, blunt needle.
- The standard LP needle has a cutting edge. A non-cutting needle requires a small scalpel nick in the patient’s skin before inserting the blunt needle.
- The incidence of post-LP headaches MAY be decreased (OR 4.6, range 0.19-1.07), because it doesn’t actually cut any dural or arachnoid fibers.
- Balance this with the fact that 3 studies show a trend towards an increased number of attempts required with the atraumatic needle. Personally, I don’t use a blunt needle.
2. Use a smaller gauge LP needle.
- A smaller gauge (26 gauge vs 22 gauge) needle yields fewer post-LP headaches with an absolute risk reduction of 26%.
- Next time, look at what size LP needle comes in your LP kit. Consider using a smaller gauge.
3. Reinsert the stylet in the needle prior to needle removal
- This causes fewer post-LP headaches with absolute risk reduction of 11%.
- The theory is than arachnoid strand may flow into the needle during CSF collection. Removing the needle without the stylet may “pull” the strand through the dura, causing a persistent CSF leak.
Reference
Straus SE, Thorpe KE, Holroyd-Leduc J. How Do I Perform a Lumbar Puncture and Analyze the Results to Diagnose Bacterial Meningitis? JAMA. 2006;296:2012-22.
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