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Hearing loss from acute carbon monoxide intoxication

S R Baker, D J Lilly

    The Annals of Otology, Rhinology, and Laryngology
    |May 1, 1977
    PubMed
    Summary

    Acute carbon monoxide (CO) poisoning can cause fluctuating hearing loss, often with a U-shaped audiogram. This hearing loss may stem from cochlear hypoxia and requires monitoring until stable.

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    Area of Science:

    • Otorhinolaryngology
    • Neuroscience
    • Toxicology

    Background:

    • Carbon monoxide (CO) poisoning is a significant public health concern.
    • While vestibular dysfunction is common in acute CO intoxication, auditory involvement is less frequent.
    • Understanding the audiological effects of CO poisoning is crucial for diagnosis and management.

    Observation:

    • A case of fluctuating sensorineural hearing loss following acute carbon monoxide poisoning is presented.
    • The patient exhibited a characteristic U-shaped audiogram, indicating reduced hearing sensitivity across specific frequencies.
    • Fluctuating hearing sensitivity was noted as a potential early indicator of acute CO exposure.

    Findings:

    • Sensorineural hearing loss in CO poisoning may be linked to hypoxic damage to the cochlea, auditory nerve (VIII nerve), and central auditory pathways in the brainstem.
    • The U-shaped audiometric curve is a notable pattern observed in some cases of CO-induced hearing impairment.
    • Hearing sensitivity fluctuations underscore the dynamic nature of auditory damage in acute CO intoxication.

    Implications:

    • Prompt audiometric evaluation is essential for individuals with suspected acute CO exposure, especially if hearing changes are reported.
    • Periodic audiological monitoring is recommended to track hearing stabilization and recovery.
    • This case highlights the importance of considering audiological assessment in the comprehensive management of carbon monoxide poisoning victims.

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