Comparative study between the normally hearing child and the hard of hearing child, by acoustic impedance measurements of the ear.

In the first part, the author makes a comparative study of the tympanometric results obtained from the normally hearing child and the hard of hearing child. The frequency of serous otitis media is statistically higher in the deaf child. The author compares such results of tympanometry as obtained from the child, considers the contribution of this technique to the field of pediatric audiology and suggests a classification of tympanograms in terms of the probe-tone frequency of the impedancemeter. The second part concerns the acoustico-facial reflex. This study compares the recording of the stapedius reflex obtained by pure tone and Narrow-Band noise acoustic stimulation, thanks to Madsen electro-acoustic bridge, in two groups of children, the one consisting of normal hearing children and the other of children suffering from severe perception hearing loss. The study of the stapedius reflex threshold makes it possible to analyse the dynamics of the field of perception in both groups. After an analysis of the results, the author outlines the importance attributable to the study of the stapedius reflex in the child as a means of objectively examining the auditive function and a means of differential diagnosis in cases of sensorineural impairment of the hearing function.