Treatment for Herpes Zoster Affecting the Cerebrospinal Fluid

Diagnosis and Clinical Presentation

Herpes zoster affecting the CSF typically presents as meningitis with signs including headache, photophobia, fever, and meningismus 2
CSF analysis usually shows lymphocytic pleocytosis, mildly elevated protein, and normal glucose 3
CSF PCR for VZV should be obtained to confirm the diagnosis 2, 3
It's critical to distinguish between VZV meningitis and encephalitis, as encephalitis is a more severe condition with potential for high neurologic morbidity and mortality 3

For confirmed VZV affecting the CSF, administer intravenous acyclovir 10 mg/kg every 8 hours for 14-21 days in adults with normal renal function 1, 4
Higher doses (20 mg/kg every 8 hours) are recommended for neonates 1
Treatment should be initiated as soon as possible after symptom onset 1, 4

If CSF pressure is ≥25 cm of CSF and there are symptoms of increased intracranial pressure, perform CSF drainage via lumbar puncture 5, 6
Reduce opening pressure by 50% if extremely high or to a normal pressure of ≤20 cm of CSF 6
For persistent pressure elevation, repeat lumbar puncture daily until pressure and symptoms stabilize 6
Consider temporary percutaneous lumbar drains or ventriculostomy for patients requiring repeated daily lumbar punctures 6

Failure to distinguish between meningitis and encephalitis can lead to inadequate treatment duration 3
Delayed initiation of antiviral therapy is associated with worse outcomes 1
Relapse can occur after completion of therapy, requiring vigilant follow-up 1
Steroid use should be carefully considered and not used routinely without specific indications 6