Choice of probe tone and classification of trace patterns in tympanometry undertaken in early infancy.

Abstract:

:Tympanometry using 226 Hz, 678 Hz, and 1000 Hz probe tones was undertaken on two groups of babies, age 2 to 21 weeks. A group of 104 babies with normal ABR thresholds or TEOAEs were compared with a second group of 107 babies who had evidence of temporary conductive hearing loss based on the findings of a test battery, which included air and bone conduction ABR. The tympanograms were classified by Method 1, a simple visual classification system, and Method 2, adapted from a system described by Marchant et al (1986). The majority of tympanograms recorded in both groups using the 226 Hz probe tone were 'normal' Type A, with no significant difference in middle ear pressure or static admittance. However, both classification methods demonstrated significant differences between the two groups using the higher frequency probe tones, with Method 2 being the preferred system of classification. Tympanometry using 226 Hz is invalid below 21 weeks and 1000 Hz is the frequency of choice.

journal_name

Int J Audiol

authors

Baldwin M

doi

10.1080/14992020600690951

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

417-27

issue

7

eissn

1499-2027

issn

1708-8186

pii

N7780J87482990GN

journal_volume

45

pub_type

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