title: Performance of fixed-pressure valve with antisiphon device SPHERA(®) in hydrocephalus treatment and overdrainage prevention.
abstract: Patients with hydrocephalus and risk factors for overdrainage may be submitted to ventricular shunt (VS) implant with antisiphon device. The objective of this study was to prospectively evaluate for two years the clinical and tomographic results of the implant of fixed-pressure valves with antisiphon device SPHERA(®) in 35 adult patients, with hydrocephalus and risk factors for overdrainage. Of these, 3 had congenital hydrocephalus in adult patients with very dilated ventricles (Evans index >50%), 3 had symptomatic overdrainage after previous VS implant (subdural hematoma, hygroma or slit ventricle syndrome), 1 had previous chronic subdural hematoma, 15 had normal pressure hydrocephalus with final lumbar pressure <5 cm H(2)O after tap test (40 mL), 6 had pseudotumor cerebri, and 7 had hydrocephalus due to other causes. Clinical improvement was observed and sustained in 94.3% of the patients during the two-year period with no computed tomography (CT) evidence of hypo or overdrainage, and no immediate early or late significant complications.
authors.affiliation: Division of Functional Neurosurgery of the Institute of Psychiatry, Hospital das Clínicas, Faculty of Medicine, Universidade de São Paulo (USP), São Paulo SP, Brazil. neurofernando@gmail.com
authors.forename: Fernando Campos Gomes
authors.initials: FC
authors.lastname: Pinto
authors.forename: Renan Muralho
authors.initials: RM
authors.lastname: Pereira
authors.forename: Felippe
authors.initials: F
authors.lastname: Saad
authors.forename: Manoel Jacobsen
authors.initials: MJ
authors.lastname: Teixeira
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015170:Cerebrospinal Fluid Pressure / Q000502:physiology; D002557:Cerebrospinal Fluid Shunts / Q000009:adverse effects / Q000295:instrumentation*; D004322:Drainage / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D006408:Hematoma, Subdural / Q000209:etiology; D006801:Humans; D006849:Hydrocephalus / Q000503:physiopathology / Q000601:surgery*; D006850:Hydrocephalus, Normal Pressure / Q000503:physiopathology / Q000601:surgery; D006874:Hydrostatic Pressure / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011559:Pseudotumor Cerebri / Q000209:etiology; D056124:Slit Ventricle Syndrome / Q000209:etiology; D014057:Tomography, X-Ray Computed; D055815:Young Adult