Effect of middle ear impedance on hearing threshold level in children with adenoid hypertrophy
Furmann, A.; Goińska, A.; Hojan, E.; Perz, P.
Otolaryngologia Polska 56(1): 77-81
2002
ISSN/ISBN: 0030-6657 PMID: 12053673 Document Number: 540930
The adenoid hypertrophy in children may lift the hearing threshold level especially for low frequency and also influence on the middle-ear impedance. The authors tested eighteen children with adenoid hypertrophy and ten healthy children. The tone audiometry for 250 Hz-8 kHz and impedance audiometry was made. For eight children with adenoid hypertrophy tests were made before and after adenoidectomy (surgical removal of the adenoids). The authors found the relation between the curve of the hearing threshold level and the middle-ear impedance. It was found correlation between the middle-ear impedance and the value of hearing threshold level for 250 Hz, 1000 Hz, 2000 Hz and average of value for 250, 500 and 1000 Hz. There was no correlation between the middle-ear impedance and the value of hearing threshold level for 500 Hz and average of value for 500, 1000 and 2000 Hz.