[Electrically evoked stapedius reflex threshold and its clinical contribution of cochlear implantations].
OBJECTIVE
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.


METHODS
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.


RESULTS
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).


CONCLUSIONS
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.
Jiang
Xue-jun
XJ
Department of Otorhinolarygology, First Affiliated Hospital of China Medical University, Shenyang 110001, China. djiangxj@163.com
Yang
Hui-jun
HJ
Hui
Lian
L
Yang
Ning
N
D000293:Adolescent; D000328:Adult; D001309:Auditory Threshold; D002648:Child; D002675:Child, Preschool; D019929:Cochlear Implantation; D003054:Cochlear Implants; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D012022:Reflex, Acoustic / Q000502:physiology*; D013198:Stapedius / Q000502:physiology*; D055815:Young Adult