CAOHC Ototoxic Agents and Chemical Exposures

Question 1

Which of the following is classified as an ototoxic solvent commonly found in industrial settings?

Accepted Answer

Toluene

Answer

Toluene is a well-documented ototoxic solvent used in paints, adhesives, and coatings. It can damage the cochlear hair cells and potentiate noise-induced hearing loss even at sub-threshold noise levels.

Question 2

What is the primary mechanism by which ototoxic chemicals damage the auditory system?

Accepted Answer

Destruction of outer hair cells in the cochlea

Answer

Ototoxic chemicals primarily damage the outer hair cells of the cochlea, particularly in the basal turn. This damage is similar to noise-induced hearing loss and often results in high-frequency sensorineural hearing loss.

Question 3

When a worker is exposed to both ototoxic chemicals and high noise levels simultaneously, the resulting hearing damage is typically:

Accepted Answer

Synergistic, greater than the sum of individual effects

Answer

Combined exposure to ototoxic chemicals and noise produces a synergistic effect, meaning the resulting hearing damage exceeds what would be expected from either exposure alone. This is why monitoring workers with dual exposures is critical.

Question 4

Which class of medications is most commonly associated with ototoxicity in occupational health monitoring?

Accepted Answer

Aminoglycoside antibiotics

Answer

Aminoglycoside antibiotics such as gentamicin and streptomycin are among the most potent ototoxic medications. Occupational hearing conservationists must consider medication history when evaluating audiometric results.

Question 5

Under OSHA regulations, what is the recommended approach when workers are exposed to ototoxic chemicals in a noisy environment?

Accepted Answer

Include them in the hearing conservation program regardless of noise level

Answer

OSHA and NIOSH recommend that workers exposed to ototoxic chemicals be included in hearing conservation programs even when noise levels are below the action level of 85 dBA. Chemical exposure can cause hearing loss independently of noise.

CAOHC - Council for Accreditation in Occupational Hearing Conservation Practice Test

CAOHC - Council for Accreditation in Occupational Hearing Conservation Practice Test

CAOHC Ototoxic Agents and Chemical Exposures