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Neonatal screening with auditory brainstem responses: results of follow-up audiometry and risk factor evaluation
Insights
Infants with multiple risk factors, including low birth weight and perinatal issues, face a high incidence of neurosensory hearing loss. Early detection through audiology screening is crucial for these high-risk infants.
Area of Science:
- Pediatrics
- Audiology
- Neonatology
Background:
- Infant hearing loss is a significant concern.
- Early identification and intervention are critical for developmental outcomes.
- Previous studies may have selection biases in identifying at-risk infants.
Purpose of the Study:
- To ascertain the incidence and outcomes of neurosensory hearing loss in infants.
- To identify specific risk factors associated with hearing impairment in newborns.
- To establish unbiased screening protocols for high-risk infant populations.
Main Methods:
- Conducted a 1-year prospective study at a tertiary care center.
- Screened all infants in intensive care and well-baby nurseries for hearing loss risk factors.
- Utilized auditory brainstem evoked response (ABR) for infants with significant risk factors.
- Performed audiometric follow-up for infants with abnormal ABR findings.
Main Results:
- Identified a 17% incidence of neurosensory hearing loss in infants with multiple risk factors.
- Key risk factors included low birth weight (<1500 gm), perinatal asphyxia, hypoxemia, and prolonged hospitalization (>2 months).
- All infants with permanent hearing loss belonged to this high-risk subgroup.
Conclusions:
- Infants with multiple identified risk factors are at the highest risk for early hearing impairment.
- Targeted audiology screening is essential for this vulnerable infant population.
- Findings support the need for comprehensive hearing loss surveillance in neonatal intensive care units.
Abstract:
To determine the incidence and outcome of neurosensory hearing loss in infants, without selection bias, volunteers screened all infants from intensive care and well-baby nurseries of a tertiary care center for risk factors over 1 year; infants with sufficient risk factors were screened for auditory brainstem evoked response. Infants with abnormal findings received audiometric follow-up. Results of a 1-year follow-up study are reported. Risk factor evaluation revealed a 17% incidence of neurosensory hearing loss in a subgroup of infants with multiple risks such as birth weight less than 1500 gm, with perinatal asphyxia, subsequent hypoxemia, and hospital stay greater than 2 months. All infants with permanent hearing loss were assigned to this category. Our results suggest that this population is at greatest risk for early hearing impairment.