CLINICAL USE OF EVOKED RESPONSE AUDIOMETRY IN INFANTS AND CHILDREN DURING SLEEP

Abstract

One hundred and eighty infants and children with chief complaint of hearing loss or speech One hundred and eighty infants and children with chief complaint of hearing loss or speech mental dificiency and group with combination of these two defects. Each group was subjected to evoked response audiometry (ERA) and behavior test, and their threshold values were compared. evoked response audiometry (ERA) and behavior test, and their threshold values were compared. evoked response audiometry (ERA) and behavior test, and their threshold values were compared. The subjects of this study were 19 normal children, 126 with hearing loss, 21 with mental deficiency and 14 with hearing loss and mental deficiency. Sixty one cases of the group with hearing loss were subjected to the play audiometry which is the most reliable, and the results were compared with those of ERA.
As a result it was found that ERA threshold of normal group ranged from 20 to 50 dB (36. 1dB on an average), while it was 30 to 60dB (49. 1 dB on an average) in the mentally deficient group, showing a difference of 10 to 15dB from the normal group. And this difference deficient group, showing a difference of 10 to 15dB from the normal group. And this difference ERA and play audiometry was -10 to 20dB (6.3dB on an average), and threshold of ERA was somewhat higher than that of the play audiometry. The threshold difference between ERA and behavior test was -20 to 10dB, and ERA gave lower threshold than the behavior test, but in the group with developmental quotient less than 50 ERA threshold was higher than that of the behavior test. Every one of these groups had the peaks mainly of P2 and N2, but showed no difference in the their latency.