Electrically evoked stapedius reflex threshold and its clinical contribution of cochlear implantations / 中华耳鼻咽喉头颈外科杂志

ABSTRACT

<p><b>OBJECTIVE</b>To investigate and measure the electrically evoked stapedius reflex threshold (ESRT) and the maximum comfortable level (MCL), the feasibility of using objective index of the fitting of speech processor was evaluated.</p><p><b>METHODS</b>The relationship of ESRT and MCL was conducted by measuring the ESRT and MCL of 28 Medel Combi 40 + cochlear implant users from August 2003 to April 2006.</p><p><b>RESULTS</b>The incidence of ESRT of 10 patient during operation was 78.3% (94/120), and the incidence 3 months after the operation was 82.5% (99/120). The incidence of ESRT in 3 patients with Large vestibular aqueduct syndrome was 47.2% (17/36). The ESRT and MCL of each electrode of those 28 patients after operation were compared, the result was shown as following (1) 247 electrodes' MCL were greater than ESRT; (2) 14 electrodes' MCL were equal to ESRT; (3) 46 electrodes' MCL were smaller than ESRT. The average of ESRT after operation was (677.1 +/- 109.8) cu, the average of MCL was (732.3 +/- 114.8) cu. ESRT was smaller than MCL (t = 11.37, P < 0.05).</p><p><b>CONCLUSIONS</b>The cochlear implantations must be in normal working condition when ESR was positive. ESRT is a useful method to map the fitting of speech processor.</p>