Effect of Low Power LASER Irradiation on Inner Ear.

概要

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Low power LASER has been reported to accelerate healing of injured peripheral nerves and soft tissue and to reduce inflammation and pain. With a 30mW Ga-Al-As diode LASER with a wave length of 790nm, we irradiated the cochlea directly through the round window membrane to determine whether LASER irradiation has any effect on the guinea pig cochlea.An electrode was put on the basal turn of the cochlea, and compound action potential (CAP) and cochlear microphonics (CM) were recorded continuously. Sound stimuli of 4kHz and 8kHz tone bursts at the level of 10 and 20dB SPL above the threshold were given by open field.In all guinea pigs, the amplitude of CAP fell to 60-80% immediately after the beginning of the irradiation and returned to the original level soon after the end of the irradiation. This phenomenon was more apparent with 8kHz sound stimuli and 10dB SPL above the threshold. The amplitude of CM changed somewhat during LASER irradiation, but no definite tendency was detected.Some different mechanisms, including activation of the efferent system, are thought to be working in the cochlea simultaneously during LASER irradiation.
耳鼻咽喉科臨床学会の論文