title: Continuous intracranial pressure monitoring via the shunt reservoir to assess suspected shunt malfunction in adults with hydrocephalus.
abstract: OBJECTIVE
  The authors attempted to determine whether continuous intracranial pressure monitoring via the shunt reservoir identifies ventriculoperitoneal (VP) shunt malfunctions that are not identified by radionuclide shunt patency study or shunt tap in adults with hydrocephalus.
  
  
  METHODS
  During a 2-year period, 26 adults underwent 32 in-hospital continuous intracranial pressure (ICP) monitoring evaluations via needle access of a shunt reservoir. Monitoring was performed for 26.8 +/- 13.8 hours (mean +/- standard deviation). No ICP waveform abnormality was detected in 31% of the evaluations (10 of 32). In contrast, abnormalities were detected in 69% (22 of 32 evaluations), including B waves (nine of 22 evaluations), siphoning (nine of 22 evaluations), and variable ICP (two of 22 evaluations). In 20 (91%) of these 22 evaluations, the ICP abnormality was detected only after continuous ICP monitoring; in the other two evaluations, ICP became abnormal immediately on accessing the shunt reservoir. On the basis of the ICP monitoring results, shunt revision was performed in 66% (21 of 32 evaluations) and medical therapy was administered in 34% (11 of 32 evaluations). Shunt revision led to symptom improvement in 82% (18 of 22 patients) and no change in 18% (four of 22 patients); medical therapy led to improvement in 18% (two of 11 patients), worsening in 18% (two of 11 patients), and no change in 64% (seven of 11 patients; p < 0.05).
  
  
  CONCLUSIONS
  Continuous ICP monitoring via the shunt reservoir provides a more accurate assessment of shunt malfunction than transient ICP monitoring with a shunt tap or a radionuclide shunt patency study. It is a safe method for evaluating patients with suspected VP shunt malfunction, provides in vivo assessment of the effect of the shunt system on a patient's ICP, and can lead to more effective shunt revision.
authors.affiliation: Department of Neurology and Neurosurgery, Johns Hopkins Medical Institutions, Baltimore, Maryland 21287, USA.
authors.forename: Romergryko G
authors.initials: RG
authors.lastname: Geocadin
authors.forename: Panayiotis N
authors.initials: PN
authors.lastname: Varelas
authors.forename: Daniele
authors.initials: D
authors.lastname: Rigamonti
authors.forename: Michael A
authors.initials: MA
authors.lastname: Williams
mesh_terms: D000328:Adult; D000368:Aged; D002557:Cerebrospinal Fluid Shunts / Q000009:adverse effects*; D004868:Equipment Failure; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000601:surgery*; D007297:Inpatients; D007427:Intracranial Pressure; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods; D009339:Needles; D012086:Reoperation