Effect of sildenafil on ABR thresholds shift to noise-induced hearing loss in guinea pigs
10.3760/cma.j.issn.1673-0860.2011.10.011
- VernacularTitle:西地那非对豚鼠噪声性听觉损伤阈移的影响
- Author:
Shu-Jun ZHANG
1
;
Xun ZHANG
;
Yuan LIANG
;
Zhuo-Li YUE
Author Information
1. 承德医学院附属医院
- Keywords:
Piperazines;
Sulfones;
Hearing loss,noise-induced;
Cochlea;
Hair cells,auditory;
Evoked potentials,auditory,brain stem
- From:
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
2011;46(10):844-847
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the protective effects of sildenafil to noise-induced hearing loss in guinea pigs.Methods Guinea pigs were randomly divided into control group,noise exposure group and the sildenafil treatment group,with 10 in each group.One week after the exposure of 110 dB (A) white noise,sildenafil [10 mg/( kg · d)] and normal saline [4 ml/( kg · d)] were injected into guinea pigs of noise plus sildenafil group(NSG) and noise plus normal saline group (NNG) respectively.One week after noise exposure to four weeks continuous administration.ABR thresholds were measured respectively prior to the experiment,1 week post-noise,1,2 and 4 weeks post-drugs.The changes of cochlea hair cells were also observed by scanning electron microscope (SEM).Results Mter noise exposure,the ABR threshold shifts in NSG were significantly fewer than that in the NNG.An average of 19.1 dB in NNG compared with 19.8 dB in NSG.Four weeks after exposure,the threshold shifts were become larger to 22.0 dB in NNG while become smaller to 4.8 dB in NSG.Compared NNG with NSG,in addition to noise exposure time point,there were statistically significant differences in the rest time points after administration of the ABR threshold (P ＜ 0.05).SEM showed that the inner and outer hair cells in NNG displayed mess,fusion and imperfections.In NSG,the hair cells displayed slight pathological changes,there was no significant difference when compared with control group.Conclusion Sildenafil is able to reduce the ascending of ABR thresholds shift,and it can significantly protect against noise-induced hearing loss.
