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Auditory brainstem responses (ABR) in neonates with hyperbilirubinemia
Indian Journal of Pediatrics
|September 1, 1990
Summary
Neonatal hyperbilirubinemia can transiently affect auditory brainstem pathways in infants, as shown by abnormal auditory brainstem response (ABR) testing. These ABR changes normalized by three months, suggesting temporary bilirubin-induced encephalopathy.
Area of Science:
- Neonatal neurology
- Auditory neurophysiology
Background:
- Neonatal hyperbilirubinemia, a common condition, can reach toxic levels.
- Bilirubin toxicity is a known risk factor for neurological damage.
Purpose of the Study:
- To investigate the impact of severe neonatal hyperbilirubinemia on the auditory brainstem pathway.
- To assess for transient bilirubin-induced encephalopathy using auditory brainstem response (ABR) testing.
Main Methods:
- Auditory brainstem response (ABR) testing was performed on 25 infants with severe hyperbilirubinemia and 20 controls.
- Testing occurred near discharge (mean conceptional age 40.4 weeks) and follow-up at 3 months.
Main Results:
- 56% of hyperbilirubinemic infants showed ABR abnormalities, primarily increased wave V threshold.
- Prolonged ABR latencies (waves III, V) and interpeak latency (I-V) were observed in jaundiced infants (P < 0.01).
- ABR changes correlated significantly with serum bilirubin levels (P < 0.001).
Conclusions:
- Severe neonatal hyperbilirubinemia is associated with transient auditory brainstem pathway dysfunction.
- Findings suggest a temporary toxic encephalopathy affecting the brainstem in jaundiced neonates.
- ABR abnormalities resolved by 3 months of age.