CAOHC Ototoxic Agents and Chemical Exposures 2

Question 1

Which statement about quinine ototoxicity is accurate?

Accepted Answer

Quinine can cause reversible hearing loss and tinnitus at high doses

Answer

Quinine permanently destroys all cochlear hair cells at any dose

Answer

Quinine only causes vestibular symptoms without hearing changes

Answer

Quinine is not ototoxic and has no effect on the auditory system

Question 2

A manufacturing plant uses both styrene and high-intensity noise. What administrative control could reduce the synergistic effect?

Accepted Answer

Scheduling solvent-intensive tasks during quieter periods of the workday

Answer

Increasing noise levels to mask the chemical odor

Answer

Reducing work hours without changing exposure conditions

Answer

Providing free hearing aids to all workers

Question 3

What is the role of pharmacokinetics in understanding ototoxic chemical exposure?

Accepted Answer

It describes how the body absorbs, distributes, metabolizes, and excretes the chemical, affecting cochlear exposure duration

Answer

It measures the volume of sound produced by chemical reactions

Answer

It determines the pitch of tinnitus caused by chemicals

Answer

It predicts the exact frequency of hearing loss for each chemical

Question 4

Which of the following describes a key challenge in establishing ototoxic chemical exposure limits?

Accepted Answer

Individual susceptibility varies widely, making a single safe limit difficult to define

Answer

All ototoxic chemicals have identical dose-response curves

Answer

Chemical ototoxicity only occurs at concentrations far above any occupational exposure

Answer

Animal studies perfectly predict human ototoxic responses

Question 5

How do reactive oxygen species (ROS) contribute to chemical ototoxicity?

Accepted Answer

Ototoxic chemicals generate ROS that damage cochlear cell membranes and DNA

Answer

ROS protect hair cells from chemical damage

Answer

ROS are only produced by noise, not chemicals

Answer

ROS improve blood flow to the cochlea during chemical exposure

Question 6

What documentation should accompany a referral to an audiologist when an OHC suspects ototoxic hearing loss?

Accepted Answer

Audiometric history, chemical exposure records, noise exposure data, and medication history

Answer

Only the most recent audiogram

Answer

A written opinion that the chemical caused the hearing loss

Answer

The worker's job title only