Relationship among loudness recruitment, cochlear microphonics and prognosis of hearing loss
- VernacularTitle:响度重振与耳蜗微音电位及耳聋预后的关系
- Author:
Xiuwu CHEN
;
Chan LIU
;
Liansheng GUO
;
Xiaoyan ZHAO
;
Bo LIU
;
Na HAN
- Publication Type:Journal Article
- Keywords:
Hyperacusis;
Cochlear Microphonic Potentials;
Prognosis
- From:
Chinese Archives of Otolaryngology-Head and Neck Surgery
2006;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
75dB SPL or no response. RESULTS The individual differences of CM absolute amplitudes among the normal hearing ones at different frequencies are distinct, but bilateral CM amplitudes in same person are almost uniform and stable. Enlargedand prolongated CM was found in ears with loudness recruitment .Of 104 cases with unilateral hearing loss, CM were enlarged and prolongated at corresponding frequencies with loudness recruitment in 95 cases(91.3 %).The prognosis of cases with CM type Ⅰ was better than those with types Ⅱ and Ⅲ. The effective rates of treatment were 78.19 % in type Ⅰ , 2.5 % in type Ⅱ, and none in type Ⅲ. There were significant differences among them. CM was slightly enlarged during sleep, and the detected threshold of CM is less than that of the awake condition. CONCLUSION CM offers the reliable information for the mechanism of loudness recruitment and is also useful for understanding the relationship among loudness recruitment, cochlear microphonics and prognosis. CM may be taken as a valuable parameter for evaluating prognosis.
