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Hearing in newborn infants of opiate-addicted mothers
Insights
Newborns exposed to opiates in utero do not face a higher risk of hearing loss. This study found no increased rate of severe bilateral hearing impairment in infants of mothers using heroin or methadone.
Area of Science:
- Neonatal audiology
- Developmental pediatrics
- Public health
Background:
- Maternal drug abuse during pregnancy is a concern for neonatal development.
- Opiate exposure in utero may potentially affect auditory development.
- Understanding neonatal hearing risk factors is crucial for early intervention.
Purpose of the Study:
- To investigate the impact of maternal opiate use (heroin, methadone) on neonatal hearing.
- To compare hearing impairment rates in opiate-exposed neonates with at-risk and non-risk neonates.
- To identify independent risk factors for severe hearing impairment in newborns.
Main Methods:
- Auditory brain-stem evoked potentials (ABEPs) were recorded in 132 neonates exposed to opiates antenatally.
- Comparison groups included 1016 neonates with risk factors and 483 hospitalized neonates without risk factors.
- Statistical analysis identified independent associations with severe hearing impairment.
Main Results:
- The rate of severe bilateral hearing impairment (> or =50 dB) in opiate-exposed infants was 1.5%.
- This rate did not significantly differ from hospitalized neonates without risk factors (2.5%).
- Intrauterine infections (toxoplasmosis, syphilis, CMV), high bilirubin, craniofacial anomalies, and prolonged mechanical ventilation were associated with increased hearing impairment.
Conclusions:
- Newborns of mothers with opiate addiction are not at increased risk for early-onset hearing loss.
- Other factors like infections and prematurity pose a greater risk for neonatal hearing impairment.
- Routine hearing screening should consider established risk factors beyond maternal opiate exposure.
Unlabelled:
To investigate effects of maternal drug abuse on neonatal hearing, auditory brain-stem evoked potentials were recorded in 132 consecutive newborn infants of mothers who had taken heroin or methadone during pregnancy, alongside 1016 neonates with and 483 hospitalized neonates without risk factors, as defined by the Joint Committee on Infant Hearing. In infants antenatally exposed to opiates, the rate of severe bilateral hearing impairment (> or =50 dB) did not differ from that of hospitalized neonates without risk factors (1.5% vs. 2.5%). In contrast, intra-uterine toxoplasmosis, syphilis, or cytomegalovirus infection, bilirubin serum concentrations >25 mg/dl, craniofacial anomalies, and mechanical ventilation for 5 days or more were independently associated with increased rates of severe hearing impairment by analysis of all 1631 infants studied.
Conclusion:
Newborns of opiate-addicted mothers are not at increased risk for early onset hearing loss.