MDRAO - Medical Device Reprocessing Association of Ontario Decontamination and Cleaning Processes Questions and Answers

Question 1

An MDRD technician is manually cleaning a set of delicate, lumened instruments. Which of the following is the MOST critical first step to ensure effective decontamination?

Accepted Answer

Flushing and brushing the lumens with a neutral pH enzymatic cleaner below the water surface.

Answer

The correct procedure involves using a neutral pH enzymatic cleaner to break down bioburden without damaging the instrument. Cleaning below the water's surface prevents aerosolization of contaminants. Hot water can cause proteins to coagulate, high-alkaline detergents can damage delicate items, and metal brushes can scratch surfaces, creating sites for biofilm to form.

Question 2

The process of 'cavitation' is essential for the efficacy of which piece of decontamination equipment?

Accepted Answer

Ultrasonic Cleaner

Answer

Cavitation is the process where microscopic bubbles, created by high-frequency sound waves, form and implode on an instrument's surface. This implosion creates a scrubbing action that dislodges soil from hard-to-reach areas like box locks and serrations. This is the primary cleaning mechanism of an ultrasonic cleaner.

Question 3

A washer-disinfector has completed a cycle for a load of general surgical instruments. Which of the following phases is primarily responsible for rendering the instruments safe to handle by reducing the number of microorganisms?

Accepted Answer

Thermal Disinfection

Answer

While all cycles are important for cleaning, the thermal disinfection phase uses a high-temperature rinse (e.g., 90°C) for a specific duration to kill most pathogenic microorganisms, achieving a level of disinfection that makes the instruments safe for handling during inspection and packaging. The other phases are focused on soil removal.

Question 4

According to Canadian Standards Association (CSA) guidelines, what is the fundamental principle for the physical layout and workflow of a Medical Device Reprocessing Department?

Accepted Answer

A one-way flow from the dirty (decontamination) to clean/sterile areas.

Answer

CSA Standard Z314 emphasizes a unidirectional workflow, moving from the most contaminated (decontamination) area, to the clean assembly area, and finally to the sterile storage/dispatch area. This is a critical principle to prevent cross-contamination between dirty and clean items.

Question 5

A new complex orthopedic instrument set arrives in the decontamination area. What is the most important resource the technician must consult before beginning the cleaning process?

Accepted Answer

The instrument manufacturer's Instructions for Use (IFU).

Answer

The manufacturer's Instructions for Use (IFU) is the legal, validated document that provides specific, step-by-step instructions for cleaning, decontamination, and sterilization. Complex instruments have unique requirements that must be followed to ensure they are safe for patient use. General policies may not cover device-specific needs.

MDRAO - Medical Device Reprocessing Association of Ontario Practice Test

MDRAO - Medical Device Reprocessing Association of Ontario Practice Test

MDRAO - Medical Device Reprocessing Association of Ontario Decontamination and Cleaning Processes Questions and Answers