Distortion-product otoacoustic emissions and auditory brainstem responses sensitivity assessment in cisplatin-induced ototoxicity in rats.
Cisplatin (cis-diamminedicloroplatinum) is an antineoplastic drug used in the treatment of a variety of cancers, especially head-and-neck cancer. Its ototoxicity, however, has been noted as a common side-effect which limits its use and causes significant morbidity.


OBJECTIVE
to assess distortion-product otoacoustic emissions (DPOAE) and brainstem evoked response audiometry (BERA) sensitivity to detect secondary ototoxicity caused by different doses and means of administration of cisplatin in rats.


METHODS
Experimental.


METHODS
Male Wistar rats were intraperitoneally (i.p.) injected with 24 mg/kg cisplatin, divided into three equal doses (8 mg/kg) or a single i.p. injection of 16 mg/kg. The animals were evaluated by distortion product otoacoustic emission (DPOAE) or brainstem evoked response audiometry (BERA) on the 3rd and 4th days after the cisplatin injection.


RESULTS
Treatment with cisplatin 24 mg/kg resulted in significant DPOAE decrease and it raised the BERA electrophysiological threshold. The 16 mg/kg dose could not significantly reduce the DPOAE amplitude, but it raised the animals' hearing thresholds - detected by the BERA.


CONCLUSIONS
In rats, BERA was more sensitivity than DPOAE at detecting cisplatin-induced ototoxicity in rats considering different doses and means of administration.
Department of Surgery, Medical School, Federal University of Ceará, Brazil.
Marcos Rabelo de
MR
Freitas
Viviane Carvalho da
VC
Silva
Gerly Anne de Castro
GA
Brito
José Valdir de
JV
Carvalho Junior
Raimundo Martins
RM
Gomes Junior
Ronaldo de Albuquerque
Rde A
Ribeiro
D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000633:toxicity*; D002945:Cisplatin / Q000008:administration & dosage / Q000633:toxicity*; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D016057:Evoked Potentials, Auditory, Brain Stem / Q000187:drug effects*; D008297:Male; D017084:Otoacoustic Emissions, Spontaneous / Q000187:drug effects*; D051381:Rats; D017208:Rats, Wistar
D000970:Antineoplastic Agents; D002945:Cisplatin