title: The effect of topical ciprofloxacin and steroid-containing ear drops for chronic suppurative otitis media on the internal ear.
abstract: Aim 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.
authors: Department of Otorhinolaryngology, Firat University Medical Faculty, 23200 Elazig, Turkey.
authors: Zeliha
authors: Z
authors: Kapusuz
authors: Erol
authors: E
authors: Keles
authors: Hayrettin Cengiz
authors: HC
authors: Alpay
authors: Turgut
authors: T
authors: Karlidag
authors: Irfan
authors: I
authors: Kaygusuz
authors: Ali Kemal
authors: AK
authors: Uzunlar
authors: Israfil
authors: I
authors: Orhan
authors: Sinasi
authors: S
authors: Yalcin
mesh_terms: D000287:Administration, Topical; D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage; D001299:Audiometry; D002908:Chronic Disease; D002939:Ciprofloxacin / Q000008:administration & dosage*; D003051:Cochlea / Q000187:drug effects / Q000648:ultrastructure; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D005938:Glucocorticoids / Q000008:administration & dosage*; D006168:Guinea Pigs; D006309:Hearing / Q000187:drug effects*; D010035:Otitis Media, Suppurative / Q000188:drug therapy* / Q000473:pathology / Q000503:physiopathology; D017084:Otoacoustic Emissions, Spontaneous / Q000187:drug effects; D038781:Otoscopy; D011239:Prednisolone / Q000008:administration & dosage; D016896:Treatment Outcome
chemical_list: D000890:Anti-Infective Agents; D005938:Glucocorticoids; D002939:Ciprofloxacin; D011239:Prednisolone