title: Investigation of topical ciprofloxacin ototoxicity in guinea pigs.
abstract: Antibiotic eardrops mostly contain potentially ototoxic aminoglycosides. Ciprofloxacin is an alternative, and there is limited experience in its topical use. To investigate the topical ototoxicity of ciprofloxacin, 11 guinea pigs have been operated on. Transbullae silicone drug delivery tubes were placed to both ears of the animals. After the operation the guinea pigs were divided into two groups. The first group of animals received 0.2 ml of 4% gentamicin in one ear and 0.2 ml of 0.9% sodium chloride solution in the other. The second group received 0.2 ml of 0.2% ciprofloxacin in the test ear and 0.2 ml of 0.9% sodium chloride solution in the control ear. All drugs were given once a day on 7 consecutive days. Auditory brainstem response thresholds were recorded using click, 4 and 8 kHz logon stimuli before and after the operation, and after topical drug application. Results were statistically compared using Wilcoxon matched pairs signed-ranks test. Comparison of the thresholds before and after the operation, physiological saline application, as well as ciprofloxacin application yielded no statistically significant differences, whereas application of gentamicin resulted in total hearing loss. The results indicate that topical use of 0.2% ciprofloxacin is not ototoxic in guinea pigs.
authors.affiliation: Department of Otolaryngology, Dokuz Eylül University School of Medicine, Izmir, Turkey. ikizao@cs.med.deu.edu.tr
authors.forename: A O
authors.initials: AO
authors.lastname: Ikiz
authors.forename: B
authors.initials: B
authors.lastname: Serbetçioğlu
authors.forename: E A
authors.initials: EA
authors.lastname: Güneri
authors.forename: S
authors.initials: S
authors.lastname: Sütay
authors.forename: K
authors.initials: K
authors.lastname: Ceryan
mesh_terms: D000287:Administration, Topical; D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000009:adverse effects; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000009:adverse effects*; D001309:Auditory Threshold / Q000187:drug effects; D002939:Ciprofloxacin / Q000008:administration & dosage / Q000009:adverse effects*; D003051:Cochlea / Q000187:drug effects*; D003638:Deafness / Q000139:chemically induced; D016503:Drug Delivery Systems; D016057:Evoked Potentials, Auditory, Brain Stem / Q000187:drug effects; D005260:Female; D005500:Follow-Up Studies; D005839:Gentamicins / Q000008:administration & dosage / Q000009:adverse effects; D006168:Guinea Pigs; D007440:Intubation / Q000295:instrumentation; D008297:Male; D010919:Placebos; D012828:Silicones; D012965:Sodium Chloride
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D005839:Gentamicins; D010919:Placebos; D012828:Silicones; D012965:Sodium Chloride; D002939:Ciprofloxacin