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Phototherapy and the brain-stem auditory evoked response in neonatal hyperbilirubinemia
1Department of Neonatology, National University Hospital, Republic of Singapore.
Insights
Brain-stem auditory evoked responses in infants with high bilirubin levels showed significant delays. Phototherapy improved these auditory responses, correlating with falling bilirubin levels.
Area of Science:
- Neonatal neurology
- Auditory neurophysiology
- Bilirubin metabolism
Background:
- Hyperbilirubinemia is common in newborns and can potentially affect neurological development.
- Auditory pathway integrity is crucial for infant development and can be assessed using brain-stem auditory evoked responses (BAER).
Purpose of the Study:
- To investigate the impact of hyperbilirubinemia on brain-stem auditory evoked responses (BAER) in infants.
- To evaluate the effect of phototherapy on BAER parameters in jaundiced infants.
- To determine the correlation between bilirubin levels and BAER improvements.
Main Methods:
- Brain-stem auditory evoked responses (BAER) were recorded in infants with hyperbilirubinemia before and during phototherapy.
- BAER parameters, including peak V latency and interpeak latencies I-V and III-V, were analyzed.
- Serum bilirubin levels were monitored throughout the study.
Main Results:
- Infants with hyperbilirubinemia exhibited significantly prolonged latencies in peak V and interpeaks I-V and III-V compared to controls.
- Phototherapy led to significant improvements in these BAER parameters.
- BAER improvements correlated significantly with decreasing serum bilirubin levels.
Conclusions:
- Hyperbilirubinemia adversely affects the brain-stem auditory pathway in infants.
- Phototherapy is effective in improving auditory pathway function in infants with jaundice.
- Auditory evoked response monitoring can provide insights into the neurological effects of bilirubin and the efficacy of treatment.
Abstract:
The latencies of peak V and interpeaks I-V and III-V in the brain-stem auditory evoked response of infants with hyperbilirubinemia before phototherapy were significantly greater than those in a control group of infants. These values of the brain stem auditory-evoked response improved significantly during phototherapy and correlated significantly with the declining bilirubin levels. Improvement continued after phototherapy, despite a rebound of serum bilirubin concentrations.