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Related Experiment Videos

Auditory brain-stem responses in hydrocephalic patients.

N Kraus, O Ozdamar, P T Heydemann

    Electroencephalography and Clinical Neurophysiology
    |July 1, 1984
    PubMed
    Summary

    Auditory brain-stem response (ABR) testing reveals significant brain-stem dysfunction in most hydrocephalus patients. These ABR abnormalities can complicate hearing assessments in this population.

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    Area of Science:

    • Neuroscience
    • Audiology
    • Pediatrics

    Background:

    • Hydrocephalus is a condition characterized by excess cerebrospinal fluid in the brain.
    • Brain-stem dysfunction can occur in patients with hydrocephalus, impacting neurological function.
    • Auditory brain-stem response (ABR) is a key electrophysiological test for evaluating the auditory pathway and brain-stem integrity.

    Purpose of the Study:

    • To investigate the prevalence and nature of auditory brain-stem response (ABR) abnormalities in patients with hydrocephalus.
    • To determine the association between ABR findings and hydrocephalus characteristics.
    • To assess the utility of ABR in detecting subclinical brain-stem pathology in hydrocephalic individuals.

    Main Methods:

    • Auditory brain-stem response (ABR) was measured in 80 ears of 40 patients diagnosed with hydrocephalus.

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  • ABR parameters analyzed included I-V interwave latency, V/I amplitude ratio, wave-shape abnormalities, and ABR thresholds.
  • Correlation analysis was performed to investigate associations between ABR abnormalities and hydrocephalus etiology, head circumference, and clinical symptoms.

    • Main Results:

    • Eighty-eight percent of hydrocephalus patients exhibited ABR abnormalities, including prolonged I-V latency (38%), reduced V/I amplitude (33%), and wave-shape issues (27-53%).
    • Elevated ABR thresholds were observed in 70% of patients, with 45% showing thresholds >20 dB HL and 25% having no detectable ABR.
    • Communicating hydrocephalus showed a significant correlation with prolonged I-V conduction time and absent ABR compared to non-communicating hydrocephalus.

    Conclusions:

    • Auditory brain-stem response (ABR) testing is highly sensitive in detecting brain-stem dysfunction associated with hydrocephalus.
    • ABR abnormalities are common in hydrocephalus and can impact the accurate assessment of hearing sensitivity.
    • ABR serves as a valuable tool for identifying clinically unsuspected brain-stem pathology in hydrocephalic patients.