CAOHC Ototoxic Agents and Chemical Exposures Flashcards
6 cards from real CAOHC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CAOHC Ototoxic Agents and Chemical Exposures flashcards as text
Which of the following workers would be considered at highest risk for ototoxic hearing loss?
Answer: A painter using solvent-based paints in a noisy factory who takes aminoglycoside antibiotics
This worker has triple risk factors: ototoxic solvent exposure from paints, noise exposure from the factory environment, and ototoxic medication use. The combination of multiple ototoxic stressors dramatically increases hearing loss risk.
What is the primary purpose of including ototoxic chemical information on a worker's audiometric record?
Answer: To provide context for interpreting threshold changes and identifying contributing factors
Recording ototoxic chemical information on the audiometric record provides essential context for interpreting any threshold changes. It helps distinguish between noise-induced, chemical-induced, and age-related hearing loss patterns.
Acrylonitrile, used in plastics manufacturing, has been associated with ototoxicity. What mechanism is suspected?
Answer: Generation of cyanide metabolites that impair cochlear cellular respiration
Acrylonitrile is metabolized to cyanide, which inhibits cytochrome oxidase and impairs cellular respiration. The cochlea's high metabolic demand makes it particularly vulnerable to this disruption of energy production.
What is a 'sentinel event' in the context of ototoxic exposure monitoring within a hearing conservation program?
Answer: An unexpected threshold shift in a worker that signals potential ototoxic exposure to the wider workforce
A sentinel event is an unexpected audiometric finding in one worker that may indicate a broader ototoxic exposure problem affecting others in the same work area. It triggers investigation of workplace chemical exposure conditions.
Which of the following combinations represents the greatest ototoxic risk to a worker?
Answer: High-dose toluene inhalation plus impulse noise above 140 dBP
High-dose toluene is a potent ototoxic solvent, and impulse noise above 140 dBP is extremely hazardous to hearing. Combined, these exposures represent the greatest synergistic risk for severe and rapid hearing loss.
What is the significance of the 'no observed adverse effect level' (NOAEL) for ototoxic chemicals?
Answer: It represents the highest exposure level at which no hearing damage has been documented in studies
The NOAEL is the highest tested dose at which no adverse ototoxic effects are observed. This value is important for setting occupational exposure limits, though individual variability means some workers may still be affected at or below this level.