MDRAO Decontamination Processes and Equipment 2

Question 1

Which type of washer-disinfector cycle uses a thermal disinfection phase to achieve an A0 value of at least 600?

Accepted Answer

Thermal disinfection cycle

Answer

A thermal disinfection cycle achieves an A0 value of at least 600, indicating sufficient lethal heat exposure to disinfect instruments.

Question 2

What is the primary purpose of the enzymatic pre-soak step in instrument decontamination?

Accepted Answer

To break down protein-based bioburden for easier removal

Answer

Enzymatic pre-soaks break down proteins, fats, and carbohydrates in bioburden, making them easier to remove during the wash cycle.

Question 3

A technician notices white mineral deposits on instruments after automated washing. What is the most likely cause?

Accepted Answer

Hard water or insufficient final rinse temperature

Answer

Hard water contains calcium and magnesium salts that precipitate as white deposits, especially if the final rinse does not use softened or purified water.

Question 4

When loading a washer-disinfector, instruments with box locks should be positioned in what manner?

Accepted Answer

Open to allow water and detergent to reach all surfaces

Answer

Box locks must be open during washing so water and detergent can penetrate the joint and remove bioburden from all surfaces.

Question 5

Which chemical agent is most appropriate for high-level disinfection of heat-sensitive flexible endoscopes?

Accepted Answer

Glutaraldehyde 2% or OPA 0.55%

Answer

Glutaraldehyde 2% and OPA 0.55% are approved high-level disinfectants for heat-sensitive scopes, achieving elimination of all microorganisms except high numbers of spores.

MDRAO - Medical Device Reprocessing Association of Ontario Practice Test

MDRAO - Medical Device Reprocessing Association of Ontario Practice Test

MDRAO Decontamination Processes and Equipment 2