Abstract
Introduction. The aim of this study was, first to determine the influence of the concentrations of volatile anaesthetics (Halothane and Isoflurane) on the intraoperative elicited electrical stapedius reflex threshold (ESRT), and second, to evaluate the relation between the obtained ESRTs and postoperative comfort (C)-levels. Material and methods. This was a prospective clinical study, performed in a single subject design. The study population comprised 13 deaf children (six boys and seven girls) undergoing cochlear implantation. The reflex thresholds were recorded at five electrodes (E22, E17, E12, E7 and E3) with four different concentrations of Halothane (0.3, 0.6, 0.9 and 1.2%) or Isoflurane (0.5, 1.0, 1.5 and 2.0%). Results. In most of the children, increasing the concentration of volatile anaesthetic agent resulted in a higher stapedius reflex threshold. After correction for this effect, a good relation was found between ESRT and C-level in all children, except one. Conclusion. The outcome of this study supports thedetermination of intraoperative electrical stapedius reflex thresholds for programming of the speech processor, post-implantation.
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