title: Measurements of intraventricular pressure in a patient shunted from the ventricle to the internal jugular vein against the direction of blood flow (the El-Shafei shunt).
abstract: OBJECTIVE
  After demonstrating the anti-siphoning properties of a distensible tube in vitro, El-Shafei constructed a shunting system that directs CSF flow into the internal jugular vein against the flow of blood. Though clinically effective, the in vivo pressure dynamics of this type of shunt system have not been investigated.
  
  
  METHODS
  After failure at multiple other extracranial absorptive sites, an 18-year-old woman was shunted from the lateral ventricle to the internal jugular vein against the direction of blood flow. The shunt system contained an in-line noninvasive telemonitor allowing examination of postural intracranial pressure dynamics in the awake state. This shunt system demonstrated postural pressure dynamics that were consistent with a stringent nonsiphoning shunting system.
  
  
  CONCLUSIONS
  These observations validate the use of the El-Shafei shunt placement as a biologically nonsiphoning CSF absorptive system. In addition, the stringency of the anti-siphoning properties of the internal jugular vein open the possibility of preferentially using this shunting system in patients who clearly exhibit symptoms of shunt overdrainage.
authors.affiliation: Section of Pediatric Neurosurgery, The University of Chicago Children's Hospital, IL 60637, USA. dfrim@peds.bsd.uchicago.edu
authors.forename: D M
authors.initials: DM
authors.lastname: Frim
authors.forename: I
authors.initials: I
authors.lastname: Munshi
authors.forename: L
authors.initials: L
authors.lastname: Goumnerova
mesh_terms: D000293:Adolescent; D002552:Cerebral Ventricles / Q000098:blood supply* / Q000601:surgery*; D002557:Cerebrospinal Fluid Shunts / Q000295:instrumentation; D002560:Cerebrovascular Circulation / Q000502:physiology; D004867:Equipment Design; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D007601:Jugular Veins / Q000601:surgery*; D014057:Tomography, X-Ray Computed; D017725:Ventricular Pressure / Q000502:physiology*