Cerebrospinal Fluid Removal for Idiopathic Intracranial Hypertension: Less Cerebrospinal Fluid Is Best

Area of Science:

• Neurology
• Neurosurgery
• Ophthalmology

Background:

• Lumbar punctures (LPs) are diagnostic for idiopathic intracranial hypertension (IIH) but can cause debilitating headaches.
• Targeting a high-normal closing pressure (CP) during LP may alleviate IIH headaches while minimizing post-procedure complications.

Purpose of the Study:

• To evaluate the efficacy and safety of low-volume cerebrospinal fluid (CSF) removal to achieve a high-normal CP in IIH patients.
• To assess the impact of this technique on IIH-associated headache relief and post-LP headache incidence.

Main Methods:

• Retrospective analysis of 146 IIH patients undergoing fluoroscopic LPs aiming for high-normal CPs (18-20 cm H2O).
• Inclusion criteria included a confirmed IIH diagnosis and one-week post-LP headache assessment.
• Data collected included CSF volume removed, opening pressure (OP), and closing pressure (CP).

Main Results:

• Mean CSF volume removed was 9.7 mL, achieving a mean CP of 17.9 cm H2O.
• Headache improved in 64% of patients; 26% experienced worsening headache, and 10% reported no change.
• Eleven patients became headache-free; 11 required hospitalization for post-LP headache.

Conclusions:

• Low-volume CSF removal to a high-normal CP effectively relieves IIH headaches in most patients.
• This approach is associated with a low incidence of debilitating post-LP headaches.
• Each mL of CSF removed decreased CP by approximately 1.5 cm H2O.