Abstract
The temporal difference limen (TDL) can be measured with noninvasive electrical ear canal stimulation. The objective of the study wa to determine the role of preoperative TDL measurements in predicting patients’ speech perception after cochlear implantation. We carried out a retrospective chart analysis of fifty-four cochlear implant (CI) patients with preoperative TDL and postoperative bisyllabic word recognition measurements in Helsinki University Central Hospital between March 1994 and March 2011. Our results show that there is no correlation between TDL and postoperative speech perception. However, patient’s advancing age correlates with longer TDL but not-directly with poorer speech perception. The results are in line with previous results concerning the lack of predictive value of preoperativ TDL measurements in CI patients.
Highlights
The temporal difference limen (TDL) can be measured with noninvasive electrical ear canal stimulation
Our results show that there is no correlation between TDL and postoperative speech perception
The results are in line with preia vious results concerning the lack of predictive value of preoperativ TDL c measurements in cochlear implant (CI) patients. mer Correspondence: Saku T
Summary
The temporal difference limen (TDL) can be measured with noninvasive electrical ear canal stimulation. The objective of the study wa to ly determine the role of preoperative TDL measurements in predicting n patients’ speech perception after cochlear implantation. O patients with preoperative TDL and postoperative bisyllabic word e recognition measurements in Helsinki University Central Hospital s between March 1994 and March 2011. Temporal processing ability is important in speech recognition.[9] Gap detection in PST has been shown to correlate with speech comprehension of CI patients in behavioral tests.[5] TDL is another measure of. The EECS equipment used in our department allows measurement of TDL but it does not allow gap detection The purpose of this retrospective chart analysis was to evaluate the possible correlation between preoperative noninvasive EECS TDL measurements and postoperative speech perception and evaluate the clinical usefulness of the EECS test. Speech perception in this study was defined as bisyllabic word recognition in quiet, since it is currently the only validated speech comprehension test in Finnish langue
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