Chen Xueqing, Han Demin, Zhao Xiaotian, Wang Shuo, Kong Ying, Liu Sha, Mo Lingyan, Liu Bo, Wu Yanjun
Beijing Institute of Otolaryngology, Affiliated Beijing Tongren Hospital of Capital University of Medical Sciences, Beijing 100730, China.
Zhonghua Er Bi Yan Hou Ke Za Zhi. 2002 Dec;37(6):435-9.
To provide an objective method to estimate T-levels and C-levels using neural response telemetry (NRT) thresholds for children, from whom we can not get accurate responses because they are very young or have other disabilities, by comparing NRT thresholds and T/C levels.
Seventy patients implanted with the nucleus CI24M multiple cochlear implant system participated in this study. 329 electrodes were tested. The software used in this study was NRT 2.04. Monopolar stimulation mode was used during NRT threshold measurement. No. 3, 5, 10, 15, 20 electrodes were tested for each patient. The T-levels and C-levels were obtained at the same visit.
92.7% of all the tested electrodes recorded NRT responses. There were variations in the amplitudes and thresholds of NRT responses across subjects and electrodes. NRT thresholds fell within the different points of the MAP dynamic range. The mean of NRT thresholds was shown to fall between the mean of T-levels and C-levels. The NRT thresholds and T/C levels reduced from basal to apical ends of the cochlear.
Considerable variability across subjects was noted. So it is difficult to estimate T-levels and C-levels accurately by testing only NRT thresholds only. NRT technology provides a new objective method for estimating T-levels and C-levels for children who are unable to cooperate with audiologists during mapping after operation. The new NRT technology should be improved in the future.
通过比较神经反应遥测（NRT）阈值与T/C水平，提供一种客观方法，用于估计因年龄过小或存在其他残疾而无法给出准确反应的儿童的T水平和C水平。
70例植入核CI24M多通道人工耳蜗系统的患者参与了本研究。共测试了329个电极。本研究使用的软件为NRT 2.04。在测量NRT阈值时采用单极刺激模式。为每位患者测试第3、5、10、15、20号电极。在同一次就诊时获取T水平和C水平。
所有测试电极中有92.7%记录到了NRT反应。不同受试者和电极的NRT反应的幅度和阈值存在差异。NRT阈值落在MAP动态范围的不同点上。结果显示，NRT阈值的均值落在T水平和C水平的均值之间。从耳蜗底部到顶部，NRT阈值和T/C水平均降低。
注意到不同受试者之间存在相当大的变异性。因此，仅通过测试NRT阈值很难准确估计T水平和C水平。NRT技术为估计术后调图期间无法与听力学家配合的儿童的T水平和C水平提供了一种新的客观方法。未来应改进新的NRT技术。
