Tympanometry at 1000 Hz and 226 Hz in 1645 Infants
ZHOU Jialin
HUANG Zhengyun
ZHONG Jianwen
FENG Shuang
ZHONG Jie
WEI Wei
Abstract：Objective To report results of tympanometry at 1000 Hz or 226 Hz in 1645 infants (0-36months). Methods Based on their hearing evaluation results, 1645 infants were divided into a normal hearing group (n=938, 1876 ears) and an ab-normal hearing group (n=938, 1414 ears). Within each group, cases were further divided into seven age groups, i.e. Group 1 (≦28days of age, n=54 [108 ears] with 34 [68 ears] in normal hearing group), Group 2 (2 to 3 months of age, n=355 [710ears] with 149 [298 ears] in normal hearing group), Group 3 (4 to 6 months of age, n=537 [1074 ears] with 201 [402 ears] in normal hear-ing group), Group 4 (7 to 9 months of age, n=236 [472 ears] with 143 [286 ears] in normal hearing group, Group 5 (10 to 12 months of age, n=97 [194 ears] with 62 [124 ears] in normal hearing group), Group 6 (13 to 24 months of age, n=259 [518 ears] with 249 [498 ears] in normal hearing group) and Group 7 (25 to 36 months of age, n=107 [214 ears] with 100 [200 ears] in nor-mal hearing group). Results Most cases in the normal hearing group showed single broad peak tympanograms with either 226 Hz or 1000 Hz probe tone. A small number of cases in the normal hearing group showed W-shaped tympangrams. With the 226 Hz probe gone, single peaked tympanograms occurred in 1403 ears (74.79%) while W-shaped tympanograms occurred in 290 ears (15.46%). With the 1000 Hz probe tone, single peaked tympanograms were seen in 1407 ears (64.07%) while W-shaped tympanograms were seen in 175 ears (5.17%). The rates of normal and abnormal results were different among groups 1 to 5 (P<0.05). Using the 1000 Hz probe tone, the rate of consistent results in groups 1 to 4 (97.06%, 91.95%, 91.04%and 81.82%re-spectively) were higher than using the 226 Hz probe tone (38.24%, 68.46%, 66.92%and 66.78%, respectively). The rate of con-sistent results in group 5 when using the 226 Hz probe tone (95.16%) was higher than when using the 1000 Hz probe tone (58.87%). In groups 6 and 7, the rates of normal and abnormal results were significantly different (P<0.05). Conclusions False negative rate can be high when using the 226 Hz probe tone in tympanometry in children younger than 10 months, and the 1000 Hz probe tone may be more suitable. The 226 Hz probe tone appears to better in children older than 10 months for tympanometry.
Keywords：Infants1000 Hz tympanometry226 Hz tympanometryMiddle ear function
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 455-459 )