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Auditory brainstem response in hyperbilirubinemic rat: Part I.

M Kuriyama¹, Y Konishi, M Sudo

¹Department of Pediatrics, Fukui Medical School, Japan.

Biology of the Neonate

|January 1, 1990

Summary

Hyperbilirubinemia in rats prolonged auditory brainstem response (ABR) latencies and decreased amplitudes, affecting the central auditory pathway. Mannitol aided ABR recovery, indicating potential therapeutic benefits.

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Area of Science:

Neuroscience
Oto-rhino-laryngology (ENT)
Toxicology

Background:

Hyperbilirubinemia, a condition of elevated bilirubin levels, can cause neurotoxicity.
The auditory brainstem response (ABR) is a non-invasive electrophysiological test assessing the auditory pathway's integrity.
The impact of hyperbilirubinemia on the auditory system and potential mitigating factors require further investigation.

Purpose of the Study:

To investigate the effects of hyperbilirubinemia on the auditory brainstem response (ABR) in a rat model.
To examine how hyperosmolality, induced by mannitol, influences these ABR changes.

Main Methods:

Rats were subjected to bilirubin loading to induce hyperbilirubinemia.
Auditory brainstem responses (ABR) were recorded to assess auditory pathway function.
Mannitol was administered to evaluate its effect on ABR parameters during hyperbilirubinemia.

Main Results:

ABR wave I remained unaffected, suggesting peripheral auditory pathway integrity.
Hyperbilirubinemia led to prolonged latencies and decreased amplitudes of ABR waves II and IV, indicating central auditory pathway damage.
These ABR alterations were reversible in the acute phase.
Mannitol administration accelerated ABR peak appearance and facilitated recovery of altered ABR parameters, particularly latency.

Conclusions:

Hyperbilirubinemia selectively affects the central auditory pathway, sparing the peripheral system.
The observed ABR changes are reversible in the acute phase.
Hyperosmolar therapy with mannitol may offer a protective or restorative effect on the auditory pathway during hyperbilirubinemia.

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