Research Papers: General

Characteristics of laser-induced shock wave injury to the inner ear of rats

[+] Author Affiliations
Takaomi Kurioka, Takeshi Matsunobu, Katsuki Niwa, Atsushi Tamura, Akihiro Shiotani

National Defense Medical College, Department of Otolaryngology-Head and Neck Surgery, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan

Satoko Kawauchi, Shunichi Sato

National Defense Medical College Research Institute, Division of Biomedical Information Sciences, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan

Yasushi Satoh

National Defense Medical College, Department of Anesthesiology, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan

J. Biomed. Opt. 19(12), 125001 (Dec 02, 2014). doi:10.1117/1.JBO.19.12.125001
History: Received July 7, 2014; Accepted November 3, 2014
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Abstract.  Recently, the number of blast injuries of the inner ear has increased in the general population. In blast-induced inner ear injury, a shock wave (SW) component in the blast wave is considered to play an important role in sensorineural hearing loss. However, the mechanisms by which an SW affects inner ear tissue remain largely unknown. We aimed to establish a new animal model for SW-induced inner ear injury by using laser-induced SWs (LISWs) on rats. The LISWs were generated by irradiating an elastic laser target with 694-nm nanosecond pulses of a ruby laser. After LISW application to the cochlea through bone conduction, auditory measurements revealed the presence of inner ear dysfunction, the extent of which depended on LISW overpressure. A significantly lower survival rate of hair cells and spiral ganglion neurons, as well as severe oxidative damage, were observed in the inner ear exposed to an LISW. Although considerable differences in the pressure characteristics exist between LISWs and SWs in real blast waves, the functional and morphological changes shown by the present LISW-based model were similar to those observed in real blast-induced injury. Thus, our animal model is expected to be useful for laboratory-based research of blast-induced inner ear injury.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Takaomi Kurioka ; Takeshi Matsunobu ; Katsuki Niwa ; Atsushi Tamura ; Satoko Kawauchi, et al.
"Characteristics of laser-induced shock wave injury to the inner ear of rats", J. Biomed. Opt. 19(12), 125001 (Dec 02, 2014). ; http://dx.doi.org/10.1117/1.JBO.19.12.125001


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