この研究の著者らは、以前に、ヒトでの携帯電話電磁界への直接ばく露（外科的条件下）により、聴性誘発の蝸牛神経複合活動電位（CNAP）の低下が生じることを報告した。今回の研究は、ブルートゥース機器でもこのような影響が生じるか否かを検証するために、12人の患者での無作為試行実験を行った。メニエール病治療のため経後静脈洞後頭蓋窩到達法による前庭神経切除を施術中に、開頭状態で、6人は携帯電話、残りの6人はブルートゥース・ヘッドセット（50cm離した携帯電話と接続）からのばく露を与えた（携帯電話アンテナとブルートゥース・ヘッドセットの位置は同じ）。ばく露前、ばく露中のCNAPを測定した（ばく露レベルの記述はない）。その結果、ブルートゥースでは影響が見られなかったが、携帯電話ではCNAP振幅の減少と潜時の増加が全ての被験者で見られた、と報告している。
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To examine whether the use of a Bluetooth headset reduces the mobile phone-exposure related effects on the human auditory nerve as detected in a previous study of the authors (Colletti et al. 2011).
In the previous study, patients suffering from Menière's disease and undergoing retrosigmoid vestibular neurectomy were exposed to electromagnetic fields generated by a mobile phone. The patients showed a substantial significant decrease in amplitude and a significant increase in latency of cochlear nerve compound action potentials during the 5 minutes of exposure to the electromagnetic field.
In the present study, 12 patients, also suffering from Menière's disease and undergoing retrosigmoid vestibular neurectomy, were directly exposed to a mobile phone or alternatively via a Bluetooth headset (6 patients, respectively).
Cochlear compound action potentials were first recorded with the cell phone in standby mode for 2 minutes and then continuously monitored during 5 minutes of active call (either via the Bluetooth headset or directly exposed to the mobile phone)
| 周波数 | 900 MHz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 5 min |
| Additional information | mobile phone |
| ばく露の発生源／構造 |
|
|---|---|
| ばく露装置の詳細 | mobile phone positioned over the craniotomy area |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| SAR | 0.82 W/kg | maximum | - | 10 g | according to manufacturer |
| 周波数 | 2.4 GHz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 5 min |
| Additional information | Bluetooth headset |
| ばく露の発生源／構造 |
|
|---|---|
| ばく露装置の詳細 | Bluetooth headset positioned over the craniotomy area, mobile phone lying approximately 50 cm away |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 電力 | 2.5 mW | maximum | - | - | - |
The directly mobile phone exposed patients showed a significant decrease in the amplitude and a significant increase in latency of cochlear nerve compound action potentials from the second to the fifth minute of exposure. The patients exposed via bluetooth showed no statistically significant changes in the latency and the amplitude of cochlear nerve compound action potentials. Between both groups, the analysis of the acoustic evoked brainstem potentials performed on wave V showed no statistically significant differences. Postoperative audiological follow-up revealed no significant hearing threshold deterioration in any of the patients.
The authors conclude that the electromagnetic fields produced by a bluetooth headset do not induce changes in the activity of the cochlear nerve, whereas direct exposure to a mobile phone could change the activity.
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