Indications for LP:CNS infection, SAH, Guillian Barree, IIH

Contraindications for LP:Space occupying lesion with mass effect ; severe thrombocytopenia and coagulopathy; cellulitis over LP site or concern for epidural abscess ; traumatic injury to spine

Complications for LP:Post LP Headache, spinal hematoma, brainstem herniation

Technique for LP: Positioning is everything.  Use US if necessary.  Check for CSF early and often.

When to CT before LP?:AMS; focal neuro deficit; new onset seizures, known CNS lesions; immunosuppression; papilledema

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