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Published on: January 23, 2017
Delayed detection of congenital hearing loss in high risk infants
N J Wild1, S Sheppard, R W Smithells
1University Department of Paediatrics and Child Health, General Infirmary, Leeds.
Insights
Early auditory evoked response testing is crucial for identifying congenital hearing impairment in high-risk infants. Delays in testing persist, highlighting the need for timely intervention to diagnose hearing loss in newborns.
Area of Science:
- Pediatric Audiology
- Neonatal Screening
- Congenital Impairment Research
Background:
- Congenital hearing impairment affects a significant number of infants.
- Early identification and intervention are critical for optimal developmental outcomes.
- Risk factors for congenital hearing loss include maternal rubella infection.
Purpose of the Study:
- To evaluate methods for investigating high-risk infants for congenital hearing impairment.
- To determine if evoked response audiometry has reduced the age of hearing loss identification.
- To assess the timeliness of diagnostic testing in at-risk neonates.
Main Methods:
- Retrospective questionnaire study of clinicians managing infants in the UK.
- Analysis of two five-year cohorts (1978-87) of infants with confirmed congenital rubella.
- Confirmation of hearing loss via audiometric evaluations, including pure tone audiograms.
Main Results:
- Over 47% of infants in the study cohorts had significant hearing impairment.
- The mean age of hearing loss confirmation decreased from 11.6 to 9.8 months with evoked response audiometry.
- Less than 21% of infants with hearing impairment received early testing within the first six months of life.
Conclusions:
- Significant delays in identifying hearing loss were observed in high-risk infants.
- Failure to implement early auditory evoked response testing contributed to diagnostic delays.
- Evoked response audiometry should be performed within the first few months of life for at-risk infants.
Objective:
To examine the methods used to investigate children at high risk of congenital hearing impairment, and to see whether the introduction of evoked response audiometry has reduced the mean age at which hearing loss is identified.
Design:
Clinicians who notified children to the national congenital rubella surveillance programme were asked retrospectively to complete a questionnaire examining the methods used to identify hearing impairment and the age at testing in two consecutive five year cohorts. The presence or absence of hearing loss was confirmed by obtaining the results of audiometric evaluations and, whenever possible, a recent pure tone audiogram.
Setting:
The United Kingdom.
Patients:
Children notified to the national congenital rubella surveillance programme and born in 1978-87 in whom IgM specific for rubella was detected shortly after birth.
Main Outcome Measures:
The age at which hearing loss was identified and the degree of loss in decibels at 250, 500, 1000, 2000, and 4000 Hz measured by pure tone audiometry.
Results:
61 (52%) Of 117 children born in 1978-82 had a hearing impairment of 40 dB or greater in both ears. The mean loss was 93 dB. In the following five years 75 (47%) of 159 children had impaired hearing, their mean loss being 96 dB. The age at which the hearing loss was confirmed decreased from 11.6 to 9.8 months as a result of earlier auditory evoked response testing. Nevertheless, only eight (13%) of the children with hearing impairment born in 1978-82 and 16 (21%) of those born in 1983-7 had these tests performed in the first six months of life.
Conclusions:
Unacceptable delays in identifying hearing loss occurred in this high risk group because of failure to arrange auditory evoked response testing in early infancy. Evoked response audiometry is sensitive and specific and should be undertaken within the first few months of life for all infants known to be at risk of sensorineural hearing loss.
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