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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...

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Xylene-induced auditory dysfunction in humans.

Adrian Fuente1, Bradley McPherson, Felipe Cardemil

  • 1School of Speech and Hearing Sciences, Facultad de Medicina, Universidad de Chile, Santiago, Region Metropolitana, Chile. afuente@med.uchile.cl

Ear and Hearing
|April 20, 2013
PubMed
Summary
This summary is machine-generated.

Xylene exposure in medical lab workers is linked to hearing problems, including difficulty detecting sounds and impaired central auditory function. Further research is needed to determine if these effects are permanent.

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Area of Science:

  • Occupational Health
  • Audiology
  • Toxicology

Background:

  • Animal studies suggest xylene causes cochlear damage.
  • Limited human data exists on xylene's ototoxicity.
  • This study investigates xylene's impact on human auditory systems.

Purpose of the Study:

  • To assess the effects of xylene exposure on peripheral and central auditory function in humans.
  • To compare audiological test results between xylene-exposed workers and a control group.
  • To correlate biological markers of xylene exposure with auditory outcomes.

Main Methods:

  • 30 xylene-exposed medical lab workers and 30 controls underwent comprehensive audiological testing.
  • Tests included pure-tone audiometry, otoacoustic emissions, and central auditory function tests.
  • Exposure assessment involved noise dosimetry, airborne xylene monitoring, and urinary methyl hippuric acid levels.

Main Results:

  • Xylene-exposed workers had significantly worse pure-tone thresholds and poorer performance on central auditory tests.
  • Auditory brainstem response showed abnormalities in the exposed group.
  • A correlation was found between urinary methyl hippuric acid levels and hearing thresholds.

Conclusions:

  • Xylene exposure is associated with adverse central auditory effects and reduced sound detection in humans.
  • Findings suggest the need for routine audiological evaluation of workers exposed to xylene.
  • Further research is required to ascertain the permanence of these auditory effects.