Title :
Temporal and frequency analysis of click-evoked otoacoustic emissions recorded from untreated congenital hypothyroid newborns
Author :
Ravazzani, M. ; Ravazzani, P. ; Medaglini, S. ; Weber, G. ; Tognola, G. ; Fornara, C. ; Bianchi, C. ; Comi, G. ; Chiumello, G. ; Grandori, F.
Author_Institution :
Dept. of Biomed. Eng., Politecnico di Milano, Milan, Italy
Abstract :
Thyroid hormone plays an important role in hearing development The exact incidence of hearing impairment in untreated congenital hypothyroid newborns (CH) is unknown. This paper presents the results of the measuring of the transient-evoked otoacoustic emissions (TEOAE) on a population of 29 newborns positive to the screening test for hypothyroidism. TEOAE were recorded in all newborns in 1 month after birth and before starting the L-thyroxin treatment. We performed both temporal and time-frequency analysis of the responses by means of wavelet transform 68 newborns who had no risk factor for hearing loss served as control. The comparison of the characteristics of temporal and frequency content of the responses of the two groups showed no statistically significant difference (p=0.01).
Keywords :
hearing; medical signal processing; otoacoustic emissions; paediatrics; time-frequency analysis; wavelet transforms; L-thyroxin treatment; click-evoked otoacoustic emissions; cochlea status; congenital deafness; peripheral auditory system; screening test; temporal analysis; thyroid hormone; time-frequency analysis; transient-evoked otoacoustic emissions; untreated congenital hypothyroid newborns; wavelet transform; Auditory system; Biochemistry; Biomedical engineering; Deafness; Digital filters; Ear; Frequency; Hospitals; Humans; Pediatrics;
Conference_Titel :
Engineering in Medicine and Biology Society, 2001. Proceedings of the 23rd Annual International Conference of the IEEE
Print_ISBN :
0-7803-7211-5
DOI :
10.1109/IEMBS.2001.1020580
