To explore the incidence of and potential risk factors for developing persistent low-pressure syndrome after lumbar puncture (LP) in patients with idiopathic intracranial hypertension (IIH), as measured by use of blood patches.
A retrospective chart review was conducted of patients with definitively diagnosed IIH by clinical examination and LP, comparing them to patients with multiple sclerosis (MS) as controls who also received diagnostic LPs. Demographic, clinical, and radiological data were collected for each patient. The main outcome measure was the rate of post-LP blood patches in IIH patients compared with MS patients. Secondary outcome measures were the likelihood of undergoing an epidural blood patch related to age, body mass index, volume removed, opening pressure, the difference between opening and closing pressure, and the level of puncture within the IIH cohort.
One hundred four IIH patients and 149 MS patients were included in the study. Among IIH patients, 12/104 (11.5%) underwent an epidural blood patch after LP as compared to 8/149 (5.4%) of the MS control patients (P = 0.086). Within the IIH population, none of the clinical or LP parameters were significantly correlated with increased risk of needing a blood patch.
The incidence of low-pressure syndrome, as measured by blood patches, is similar in IIH patients and MS controls. This suggests that having elevated intracranial pressure before an LP is not protective against developing postpuncture low-pressure syndrome, contrary to common assumptions.
Department of Ophthalmology and Visual Sciences (PL, JBH, MOG, GPVS), Washington University School of Medicine, St. Louis, Missouri; Mallinckrodt Institute of Radiology (MG), Washington University School of Medicine, St. Louis, Missouri; and Department of Neurology (MG, GPVS), Washington University School of Medicine, St. Louis, Missouri.
Address correspondence to Gregory P. Van Stavern, MD, Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, 660 South Euclid Avenue, Campus Box 8096, St. Louis, MO 63110-1010; E-mail: firstname.lastname@example.org
Supported by DOVS Core Grant 5 P30 EY02687, Institute for Clinical and Translational Sciences grant RR023496, Biostat Core Grant U54 RR023496, an unrestricted grant from Research to Prevent Blindness, NIH Core Vision Grant P30 EY02687, and Dean's Fellowship (Washington University School of Medicine, Washington University in St. Louis, Missouri).
The authors report no conflicts of interest.