MDRAO - Medical Device Reprocessing Association of Ontario Decontamination and Cleaning Processes Questions and Answers 1 — 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?
- Soaking the instruments in hot water with a high-alkaline detergent.
- Scrubbing the lumens vigorously with a metal wire brush.
- Wiping the exterior with a disinfectant before any cleaning.
- Flushing and brushing the lumens with a neutral pH enzymatic cleaner below the water surface. (Correct answer)
Correct answer: Flushing and brushing the lumens with a neutral pH enzymatic cleaner below the water surface.
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?
- Cart Washer
- Steam Sterilizer
- Ultrasonic Cleaner (Correct answer)
- Washer-Disinfector
Correct answer: Ultrasonic Cleaner
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?
- Pre-Rinse
- Detergent Wash
- Final Rinse
- Thermal Disinfection (Correct answer)
Correct answer: Thermal Disinfection
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?
- Separating sterile storage from the clean assembly area.
- Ensuring positive air pressure in the decontamination area.
- A one-way flow from clean to dirty areas to maximize efficiency.
- A one-way flow from the dirty (decontamination) to clean/sterile areas. (Correct answer)
Correct answer: A one-way flow from the dirty (decontamination) to clean/sterile areas.
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?
- The hospital's general cleaning policy.
- A senior technician's personal preference.
- The instrument manufacturer's Instructions for Use (IFU). (Correct answer)
- The operating room nurse's verbal instructions.
Correct answer: The instrument manufacturer's Instructions for Use (IFU).
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.
Question 6: When manually cleaning instruments, why is it recommended to use a detergent with a neutral pH?
- It is less expensive than other detergent types.
- It is most effective at removing inorganic soils and minerals.
- It prevents damage and corrosion to delicate instruments. (Correct answer)
- It automatically disinfects the instruments during the wash phase.
Correct answer: It prevents damage and corrosion to delicate instruments.
Neutral pH detergents are less likely to cause corrosion, pitting, or other damage to stainless steel and other materials commonly used in surgical instruments. Both highly alkaline and highly acidic detergents can be corrosive and may invalidate the instrument manufacturer's warranty.
MDRAO - Medical Device Reprocessing Association of Ontario Decontamination and Cleaning Processes Questions and Answers 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?