Auditory brainstem responses (ABR) in children with neurological disorders

Area of Science:

• Pediatric Neurology
• Neurophysiology
• Auditory System Assessment

Background:

• Neurological disorders in children can affect auditory pathways.
• Early detection of auditory pathway disturbances is crucial for management.
• Auditory brainstem responses (ABR) offer a non-invasive method for assessing auditory nerve and brainstem function.

Purpose of the Study:

• To evaluate the utility of auditory brainstem responses (ABR) in identifying auditory pathway abnormalities in children diagnosed with various neurological disorders.
• To correlate ABR findings with specific neurological conditions and assess changes over time where applicable.

Main Methods:

• Auditory brainstem responses (ABR) were recorded in 35 children with diagnosed neurological disorders and 24 age-matched healthy controls.
• ABR results were analyzed for evidence of peripheral and/or central auditory pathway delays.
• Correlation with other electrophysiological measures (e.g., ulnar nerve conduction velocity) and clinical outcomes was performed for specific conditions.

Main Results:

• Abnormal ABR results were observed in 16 out of 35 children with neurological disorders.
• Metachromatic leukodystrophy cases showed widespread demyelination affecting both peripheral and central auditory pathways.
• Lead poisoning cases exhibited peripheral pathway delays, with improvement after chelation therapy in some instances; one case showed central delay only.
• Other conditions like osteopetrosis, hydrocephalus, spinal muscular atrophy, and cerebral palsy also demonstrated varying degrees of auditory pathway dysfunction.
• Complete absence of responses was noted in severe conditions including congenital rubella and undiagnosed degenerative neurological disease.

Conclusions:

• Auditory brainstem responses (ABR) are a valuable diagnostic tool for detecting auditory nerve and brainstem disturbances in pediatric neurological conditions.
• ABR findings can provide insights into the nature and extent of auditory pathway involvement, aiding in diagnosis and management.
• The study underscores the importance of audiological assessment, specifically ABR, in the comprehensive evaluation of children with neurological disorders.