Lin chuang er bi yan hou tou jing wai ke za zhi = Journal of clinical otorhinolaryngology head and neck surgery · 2008
[Effects of tympanic membrane perforation on real-ear to coupler difference].
Аннотация на английскомСтатьяНазвание и аннотация: Перевод пока не подготовлен
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Liu Ping, Chen Shufei, Zheng Zhoushu
Аннотация
OBJECTIVE: To investigate the effects of tympanic membrane perforation on real-ear to coupler difference (RECD) in adults.
METHOD: RECD was measured in 34 ears with dry tympanic membrane perforation, 34 normal subjects served as controls.
RESULT: There was significant difference (P<0.05) below 1 kHz (including 1 kHz) and in 4 kHz between experimental group and control group. For perforated ears, RECD was 3.5-15 dB less from 250 Hz to 1 kHz while the values of RECD was negative from 250 Hz to 750 Hz. A larger standard deviation was found in experimental group. The mean intra-subject standard deviation was 4.4 dB in experimental group as contrasted with 1.4 dB in control group. The equivalent ear canal volume appeared to be negatively correlated with the RECD reduction below 0.75 kHz and no correlation above 1 kHz. The more the equivalent ear canal volume, the smaller the RECD. It was found that the size of tympanic membrane perforation had no effect on RECD.
CONCLUSION: It is recommended to perform real-ear measurement individually instead of using the age-appropriate average values, and to increase low frequency gain appropriately when fitting hearing aids for patients with dry tympanic membrane perforation.
METHOD: RECD was measured in 34 ears with dry tympanic membrane perforation, 34 normal subjects served as controls.
RESULT: There was significant difference (P<0.05) below 1 kHz (including 1 kHz) and in 4 kHz between experimental group and control group. For perforated ears, RECD was 3.5-15 dB less from 250 Hz to 1 kHz while the values of RECD was negative from 250 Hz to 750 Hz. A larger standard deviation was found in experimental group. The mean intra-subject standard deviation was 4.4 dB in experimental group as contrasted with 1.4 dB in control group. The equivalent ear canal volume appeared to be negatively correlated with the RECD reduction below 0.75 kHz and no correlation above 1 kHz. The more the equivalent ear canal volume, the smaller the RECD. It was found that the size of tympanic membrane perforation had no effect on RECD.
CONCLUSION: It is recommended to perform real-ear measurement individually instead of using the age-appropriate average values, and to increase low frequency gain appropriately when fitting hearing aids for patients with dry tympanic membrane perforation.