Intraoperative observation of changes in cochlear nerve action potentials during exposure to electromagnetic fields generated by mobile phones.

Journal of neurology, neurosurgery, and psychiatry · 2011 · Harm · Low evidence

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HarmLow evidencePaper 4346

During 5 minutes of exposure to mobile phone EMF, all patients showed a substantial decrease in amplitude and a significant increase in latency of cochlear nerve compound action potentials. These changes lasted for about 5 minutes after exposure.

Study snapshot

PublicationJournal of neurology, neurosurgery, and psychiatry · 2011

Study typerandomized_trial

Reported directionHarm

Evidence ratingLow

Abstract

BACKGROUND: The rapid spread of devices generating electromagnetic fields (EMF) has raised concerns as to the possible effects of this technology on humans. The auditory system is the neural organ most frequently and directly exposed to electromagnetic activity owing to the daily use of mobile phones. In recent publications, a possible correlation between mobile phone usage and central nervous system tumours has been detected. Very recently a deterioration in otoacoustic emissions and in the auditory middle latency responses after intensive and long-term magnetic field exposure in humans has been demonstrated. METHODS: To determine with objective observations if exposure to mobile phone EMF affects acoustically evoked cochlear nerve compound action potentials, seven patients suffering from Ménière's disease and undergoing retrosigmoid vestibular neurectomy were exposed to the effects of mobile phone placed over the craniotomy for 5 min. RESULTS: All patients showed a substantial decrease in amplitude and a significant increase in latency of cochlear nerve compound action potentials during the 5 min of exposure to EMF. These changes lasted for a period of around 5 min after exposure. DISCUSSION: The possibility that EMF can produce relatively long-lasting effects on cochlear nerve conduction is discussed and analysed in light of contrasting previous literature obtained under non-surgical conditions. Limitations of this novel approach, including the effects of the anaesthetics, craniotomy and surgical procedure, are presented in detail.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typerandomized_trial

Effect directionharm

Populationseven patients with Ménière's disease undergoing retrosigmoid vestibular neurectomy

Sample size7

Exposure5 minutes

Evidence strengthLowConfidence: 40% · Peer reviewed: yes

Main findings

Outcomes measured

amplitude of cochlear nerve compound action potentials
latency of cochlear nerve compound action potentials

Limitations

small sample size
patients undergoing surgery which may affect results
effects of anaesthetics and craniotomy may confound findings
non-surgical conditions not tested

View raw extracted JSON

{
  "study_type": "randomized_trial",
  "exposure": {
    "band": null,
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "5 minutes"
  },
  "population": "seven patients with Ménière's disease undergoing retrosigmoid vestibular neurectomy",
  "sample_size": 7,
  "outcomes": [
    "amplitude of cochlear nerve compound action potentials",
    "latency of cochlear nerve compound action potentials"
  ],
  "main_findings": "During 5 minutes of exposure to mobile phone EMF, all patients showed a substantial decrease in amplitude and a significant increase in latency of cochlear nerve compound action potentials. These changes lasted for about 5 minutes after exposure.",
  "effect_direction": "harm",
  "limitations": [
    "small sample size",
    "patients undergoing surgery which may affect results",
    "effects of anaesthetics and craniotomy may confound findings",
    "non-surgical conditions not tested"
  ],
  "evidence_strength": "low",
  "confidence": 0.4,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "mobile phone",
    "electromagnetic fields",
    "cochlear nerve",
    "auditory system",
    "compound action potentials",
    "Ménière's disease",
    "neurosurgery"
  ],
  "suggested_hubs": [
    {
      "slug": "mobile-phone-emf",
      "weight": 0.9,
      "reason": "Study directly investigates effects of mobile phone EMF exposure."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1136/jnnp.2010.222737
PubMed: 21172864

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