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Related Experiment Video

Updated: Nov 17, 2025

Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus
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Effect of audiological testing on programmable ventriculoperitoneal shunts.

Ayeshah Abdul-Hamid1, Gulam Zilani2, Catriona Bryant3

  • 1Department of Ear, Nose and Throat, Royal Berkshire Hospital NHS Trust, Reading, UK.

International Journal of Audiology
|February 15, 2021
PubMed
Summary

Audiological testing equipment poses minimal risk of reprogramming programmable ventriculoperitoneal (VP) shunts. Measurements show magnetic fields are weak and dissipate quickly, with no reprogramming observed in this study.

Keywords:
Audiology assessmentaudiology equipmentmagnetic strengthnewborn hearing screeningprogrammable ventriculoperitoneal shuntssupra-aural headphones

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Area of Science:

  • Audiology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • Programmable ventriculoperitoneal (VP) shunts are crucial for managing hydrocephalus.
  • Audiological testing is common in patients with neurological conditions.
  • Potential electromagnetic interference from audiological equipment with VP shunts is a concern.

Purpose of the Study:

  • To measure magnetic field strength of common audiological devices.
  • To assess the risk of VP shunt reprogramming by these devices.
  • To quantify the safety of audiological testing in patients with VP shunts.

Main Methods:

  • Magnetic field strength of various audiological transducers was measured.
  • Testing was performed on a skull model with three common programmable VP shunts (Miethke ProGAV 2.0, Medtronic Strata II, Codman Hakim).
  • In vitro measurements were conducted to simulate clinical conditions.

Main Results:

  • Supra-aural earphones exhibited a magnetic field of 14 mT at 0 mm, decreasing to 0 mT at 10 mm.
  • Other audiological equipment showed magnetic field strengths of 3.5 mT or less at 0 mm.
  • No VP shunt reprogramming occurred during the study.

Conclusions:

  • The risk of accidental VP shunt reprogramming by audiological testing transducers is very low.
  • Direct placement of transducers over the VP shunt should be avoided as a precautionary measure.
  • This study supports the safety of audiological testing in patients with programmable VP shunts.