MDRAO High-Level Disinfection 2

Question 1

Which of the following is an advantage of orthophthalaldehyde (OPA) over glutaraldehyde for high-level disinfection?

Accepted Answer

Less toxic vapor and reduced eye/skin irritation

Answer

OPA has significantly lower vapor pressure than glutaraldehyde, resulting in less odor, fewer respiratory irritant concerns, and reduced need for special ventilation.

Question 2

The minimum recommended contact time for high-level disinfection with 2% glutaraldehyde at 20°C (68°F) is typically:

Accepted Answer

20 minutes

Answer

At 20°C, a minimum contact time of 20 minutes is required for 2% glutaraldehyde to achieve high-level disinfection.

Question 3

After high-level disinfection, devices must be rinsed thoroughly. What is the PREFERRED rinsing solution?

Accepted Answer

Sterile or filtered water

Answer

Sterile or filtered water prevents recontamination from waterborne pathogens such as Legionella or Pseudomonas that may be present in tap water.

Question 4

Peracetic acid is often preferred for automated endoscope reprocessors because it:

Accepted Answer

Is effective at low concentrations with rapid action and low residue

Answer

Peracetic acid achieves HLD rapidly, leaves minimal residue, and breaks down into non-toxic byproducts (acetic acid and water), making it well-suited for automated systems.

Question 5

How does elevated temperature affect the efficacy of high-level disinfectant solutions?

Accepted Answer

It increases efficacy, allowing shorter contact times

Answer

Higher temperatures increase the rate of chemical reactions, enhancing the disinfectant's microbicidal activity and often reducing the required contact time.

MDRAO - Medical Device Reprocessing Association of Ontario Practice Test

MDRAO - Medical Device Reprocessing Association of Ontario Practice Test

MDRAO High-Level Disinfection 2