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, historically used for malaria treatment, can cause temporary hearing loss and tinnitus, particularly at higher doses. The effects are generally reversible upon discontinuation, similar to salicylate ototoxicity.

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

Scheduling solvent-intensive work during quieter periods reduces simultaneous exposure to both hazards. By separating the timing of chemical and noise exposures, the synergistic damage potential is reduced.

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

Pharmacokinetics describes the absorption, distribution, metabolism, and excretion of chemicals in the body. Understanding these processes helps predict how long and at what concentration an ototoxic agent will be present in the cochlea.

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

Individual susceptibility to ototoxic chemicals varies greatly due to genetics, age, concurrent exposures, and health status. This variability makes it challenging to establish a single exposure limit that protects all workers.

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

Many ototoxic chemicals generate reactive oxygen species that cause oxidative stress in cochlear cells. This oxidative damage to cell membranes, proteins, and DNA in the hair cells and stria vascularis is a common pathway for chemical ototoxicity.

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 2