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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
