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Proceedings Paper

Cochlea hair cell rescue after a noise-induced hearing loss using a low level laser therapy (LLLT)
Author(s): Chung-Ku Rhee; Chan Woong Bahk; Jae Yun Jung; Jin-Chul Ahn; Myung-Whan Suh
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Paper Abstract

Aim: To see the effect of LLLT on noise-induced hearing loss. Methods: Eleven rats were exposed to noise (120 dB, 16 kHz, 6 h) and left ears were irradiated at 60J/cm2, 830 nm laser for 12 days. Right ears were control. Hearing levels were measured at frequencies of 4, 8, 12, 16, 32 kHz before noise exposure and after 12th irradiations. Results: The initial hearing levels were 26.5±4.7, 24.5±5.0, 24.0±5.2, 24.0±3.2, 24.5±5.5 dB SPL. After noise exposure, thresholds were 63.5±15.1, 64±16.8, 71.5±11.3, 73.5±15.6, 67.5±14.4 dB SPL in 4, 8, 12, 16, 32 kHz. After 12th irradiation, thresholds of treated ears recovered significantly 21±4.2, 20±3.5, 24±11.9, 24±12.9, 21±2.2 dB SPL and that of the untreated right ears measured 36.3±22.9, 45±15.8, 66.3±22.9, 50±16.8, 43.8±21.4 dB SPL. Conclusion: LLLT may promote recovery of hearing after noiseinduced hearing loss.

Paper Details

Date Published: 18 February 2011
PDF: 7 pages
Proc. SPIE 7883, Photonic Therapeutics and Diagnostics VII, 788322 (18 February 2011); doi: 10.1117/12.880193
Show Author Affiliations
Chung-Ku Rhee, Dankook Univ. (Korea, Republic of)
Chan Woong Bahk, Dankook Univ. (Korea, Republic of)
Univ. of Illinois Urbana-Champaign (United States)
Jae Yun Jung, Dankook Univ. (Korea, Republic of)
Jin-Chul Ahn, Dankook Univ. (Korea, Republic of)
Myung-Whan Suh, Dankook Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7883:
Photonic Therapeutics and Diagnostics VII
Kenton W. Gregory; Nikiforos Kollias; Andreas Mandelis; Henry Hirschberg; Hyun Wook Kang; Anita Mahadevan-Jansen; Brian Jet-Fei Wong; Justus F. R. Ilgner; Bodo E. Knudsen; E. Duco Jansen; Steen J. Madsen; Guillermo J. Tearney; Bernard Choi; Haishan Zeng; Laura Marcu, Editor(s)

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