Influence of cochleostomy and cochlear implant insertion on drug gradients following intratympanic application in guinea pigs
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Date
2013-09
Journal Title
Journal ISSN
Volume Title
Publisher
Karger Medical and Scientific Publishers
Abstract
Locally applied drugs can protect residual hearing following cochlear implantation. The influence of cochlear implantation on drug levels in the scala tympani (ST) after round window application was investigated in guinea pigs using the marker trimethylphenylammonium (TMPA) measured in real time with TMPA-selective microelectrodes. TMPA concentration in the upper basal turn of the ST rapidly increased
during implantation and then declined due to cerebrospinal fluid entering the ST at the cochlear aqueduct and exiting at the cochleostomy. The TMPA increase was found to be caused by the cochleostomy drilling if the burr tip partially entered the ST. TMPA distribution in the second turn was less
affected by implantation procedures. These findings show that basal turn drug levels may be changed during implantation and the changes may need to be considered in the interpretation of therapeutic effects of drugs in conjunction with implantation.
Description
Keywords
Cochleostomy, Perforation, Cochlear Implant, Electrode, Pharmokinetics, Drug Distribution, Computational Modelling
Citation
King, E. B., Hartsock, J. J., O'Leary, S. J., & Salt, A. N. (2013). Influence of cochleostomy and cochlear implant insertion on drug gradients following intratympanic application in guinea pigs. Audiol Neurotol, 18(5), 307-316. doi: 10.1159/000353534