Kapusuz, ZelihaKeleş, ErolAlpay, Hayrettin CengizKarlıdağ, TurgutKaygusuz, İrfanUzunlar, Ali KemalYalçın, Şinasi2020-04-302020-04-3020100937-44771434-4726https://doi.org/10.1007/s00405-009-1012-xhttps://hdl.handle.net/20.500.12684/4923KARLIDAG, turgut/0000-0003-2748-7309; Kaygusuz, Irfan/0000-0002-5237-2362; Keles, Erol/0000-0003-4443-6714; YALCIN, SINASI/0000-0002-6528-9234WOS: 000272074500006PubMed: 19554344Aim of the study is to evaluate the effects of topical ciprofloxacin and prednisolone-containing ear drops for chronic suppurative otitis media on hearing threshold, cochlear reserve and cochlea morphology in healthy subjects and to determine the proper drug dose. Sixty-eight guinea pigs, all of which had healthy hearing, were used for the study. The first group (n = 30) was administered ciprofloxacin three times a day, the second group (n = 30) was administered prednisolone three times a day and the third group (n = 8) was administered sterile distilled water three times a day. The therapies lasted for 7 days and were administered intratympanically. The first group and second group were divided into three sub-groups of ten subjects. The first sub-group (n = 10) was administered an equivalent dose per kilogram as in humans, the second sub-group (n = 10) was administered one-third of the human-equivalent dose and the third sub-group (n = 10) was administered tenfold the human-equivalent dose. All subjects underwent brainstem evoked response audiometry (BERA) and distortion product otoacoustic emission (DPOAE) testing on the seventh and twenty-first days following the therapy. Following the tests, two subjects from each group were decapitated and examined under electron microscope. BERA and DPOAE testing results of the sub-group (n = 10) which was administered tenfold the human-equivalent dose were significantly different from the control group and other groups (P < 0.05). According to electron microscopic examination of the cochlea, the group which was administered a tenfold human-equivalent dose of intratympanic ciprofloxacin and prednisolone showed atrophy in cells and degenerations in cilia. This case was statistically significant when compared with the control group and other groups (P < 0.05). Ciprofloxacin and prednisolone applied at a human-equivalent dose per kilogram did not affect the hearing and cochlear histology of subjects.en10.1007/s00405-009-1012-xinfo:eu-repo/semantics/closedAccessCiprofloxacinPrednisoloneOtotoxicityArticle26713541WOS:000272074500006Q1Q2