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Safety of the adjustable pressure ventricular valve in magnetic resonance imaging: problems and solutions

P Fransen1, G Dooms, C Thauvoy

  • 1Neurosurgery Service, Clinique Universitaire St. Luc, Bruxelles, Belgium.

Neuroradiology
|January 1, 1992
PubMed

Insights

Magnetic resonance imaging (MRI) in patients with hydrocephalus using Sophy adjustable pressure valves (PAVS) revealed significant valve pressure changes post-scan. These adjustable valves could be safely readjusted percutaneously, highlighting their utility and safety during MRI.

Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Hydrocephalus management often involves cerebrospinal fluid (CSF) shunts with pressure valves.
  • Adjustable pressure valves (PAVS) allow for non-invasive pressure modification.
  • Magnetic resonance imaging (MRI) is a common diagnostic tool but can potentially affect implanted devices.

Purpose of the Study:

  • To evaluate the safety and effect of MRI on Sophy adjustable pressure valves (PAVS) in hydrocephalus patients.
  • To assess the incidence of pressure valve malfunction after MRI exposure.
  • To determine the feasibility of percutaneous readjustment of affected valves.

Main Methods:

  • Magnetic resonance imaging (MRI) was performed on 30 patients with hydrocephalus.
  • Patients were implanted with Sophy adjustable pressure valves (PAVS).
  • Post-MRI pressure valve function was checked and readjustment procedures were performed if necessary.

Main Results:

  • A significant proportion of Sophy adjustable pressure valves (PAVS) showed pressure changes after MRI.
  • Percutaneous manipulation allowed for easy readjustment of the affected valves.
  • No adverse events related to MRI or readjustment were reported.

Conclusions:

  • Sophy adjustable pressure valves (PAVS) are generally safe for use during MRI examinations in hydrocephalus patients.
  • The potential for MRI-induced pressure changes in PAVS is a recognized issue.
  • Percutaneous readjustment is an effective method to restore correct valve function post-MRI, preserving the value of PAVS.

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