HSPA Decontamination and Cleaning Processes 2 — Questions and Answers
Question 1: What is the first step in decontamination for soiled surgical instruments?
- Ultrasonic cleaning
- Manual scrubbing with a brush
- Point-of-use pre-treatment to prevent bioburden from drying (Correct answer)
- Placing instruments directly into the washer-disinfector
Correct answer: Point-of-use pre-treatment to prevent bioburden from drying
Point-of-use pre-treatment prevents blood and tissue from drying on surfaces, making subsequent cleaning more effective.
When blood and tissue dry on instruments, they form tenacious biofilm extremely difficult to remove. Applying enzymatic spray or keeping instruments moist prevents this. AAMI ST79 emphasizes this step is essential.
Question 2: What minimum water temperature is typically required for thermal disinfection in a washer-disinfector?
- 140°F (60°C)
- 160°F (71°C)
- 180°F (82°C) (Correct answer)
- 212°F (100°C)
Correct answer: 180°F (82°C)
Thermal disinfection requires water temperatures of at least 180°F (82°C) to achieve high-level disinfection.
Washer-disinfectors use 180°F or higher during the final rinse for thermal disinfection. The A0 concept quantifies the microbicidal effect, with A0 600 being the minimum recommended for surgical instruments.
Question 3: Why must aluminum instruments be segregated during decontamination?
- They are too lightweight for standard racks
- Alkaline detergents can cause corrosion and discoloration of aluminum (Correct answer)
- They require higher sterilization temperatures
- Aluminum is incompatible with ultrasonic cleaning
Correct answer: Alkaline detergents can cause corrosion and discoloration of aluminum
Aluminum reacts with alkaline detergents, causing pitting, corrosion, and discoloration, so neutral pH detergents must be used.
Aluminum reacts with both strongly alkaline and acidic detergents. Aluminum instruments must be washed separately using pH-neutral detergents. Mixing aluminum with stainless steel in alkaline wash cycles is a common cause of damage.
Question 4: What is the purpose of the lubrication step (milk bath) in instrument processing?
- To sterilize instrument joints
- To protect moving parts and prevent corrosion with a water-soluble lubricant (Correct answer)
- To remove stubborn bioburden from box locks
- To add a protective color coating
Correct answer: To protect moving parts and prevent corrosion with a water-soluble lubricant
Instrument milk coats surfaces and joints to prevent corrosion, reduce friction, and extend instrument life.
The lubricant must be water-soluble so it does not interfere with sterilant penetration. Silicone-based or mineral oil lubricants should never be used as they create a barrier preventing steam contact.
Question 5: What determines the minimum exposure time for manual cleaning with enzymatic detergent?
- 30 seconds
- The time specified by the detergent manufacturer's IFU (Correct answer)
- Exactly 5 minutes regardless of product
- No minimum time is required
Correct answer: The time specified by the detergent manufacturer's IFU
Enzymatic detergent soak times must follow the manufacturer's IFU, as different formulations require different contact times.
The manufacturer's IFU dictates correct dilution, water temperature, and contact time. SPD must have current IFU for every chemical product. This is a regulatory requirement under FDA, Joint Commission, and AAMI.
Question 6: What type of water should be used for the final rinse in instrument reprocessing?
- Tap water
- Distilled or deionized water
- Critical water meeting AAMI quality standards (Correct answer)
- Any available clean water
Correct answer: Critical water meeting AAMI quality standards
Critical water meeting AAMI TIR34 standards prevents mineral deposits, spotting, and contamination of cleaned instruments.
AAMI TIR34 defines water quality standards for reprocessing. Critical water must meet limits for bacteria, endotoxins, conductivity, pH, hardness, and total dissolved solids.
HSPA Decontamination and Cleaning Processes 2
What is the first step in decontamination for soiled surgical instruments?