CER Endoscope Sterilization Methods Questions and Answers 5 — Questions and Answers
Question 1: An endoscope manufacturer's IFU states the scope is NOT compatible with ETO sterilization. What is the MOST likely reason?
- ETO cannot penetrate the internal channels of the endoscope
- ETO residuals are absorbed by scope materials and may cause patient harm (Correct answer)
- ETO has insufficient sporicidal activity for this device category
- ETO aeration times exceed the practical turnaround needs for this scope
Correct answer: ETO residuals are absorbed by scope materials and may cause patient harm
Certain endoscope materials absorb ETO and its toxic byproducts, which may not fully dissipate even after aeration and could pose a direct injury risk to mucosal tissue.
Question 2: A heat-sensitive flexible endoscope has a single working channel with an internal diameter of 1.5mm and length of 600mm. Which sterilization method is MOST appropriate?
- Steam autoclave at 134°C pre-vacuum cycle
- Ethylene oxide (ETO) sterilization per manufacturer IFU (Correct answer)
- Hydrogen peroxide gas plasma (STERRAD)
- Dry heat sterilization at 160°C
Correct answer: Ethylene oxide (ETO) sterilization per manufacturer IFU
ETO penetrates long, narrow lumens effectively and operates at low temperatures, making it the preferred sterilization method when H2O2 plasma is contraindicated by lumen geometry.
Question 3: During processing, a technician finds that the peracetic acid concentration in the STERIS System 1E fell below minimum effective concentration mid-cycle. What is the correct action?
- Allow the cycle to complete and release the endoscope as sterilized
- Abort the cycle and reprocess the endoscope in a new load with fresh sterilant (Correct answer)
- Add additional sterilant concentrate to the chamber to restore concentration
- Extend the exposure time by 50% to compensate for reduced concentration
Correct answer: Abort the cycle and reprocess the endoscope in a new load with fresh sterilant
A cycle in which sterilant concentration was inadequate cannot be considered a valid sterilization cycle; the endoscope must be reprocessed from the beginning in a new cycle with verified sterilant.
Question 4: Using the Spaulding classification system, flexible endoscopes that enter sterile body cavities (e.g., laparoscopes) are classified as which device category?
- Non-critical items requiring low-level disinfection
- Semi-critical items requiring high-level disinfection
- Critical items requiring sterilization (Correct answer)
- Uncategorized items subject to facility discretion
Correct answer: Critical items requiring sterilization
Critical items, per Spaulding, contact sterile tissue or enter the vascular system and must be sterilized to prevent any risk of infection.
Question 5: What is the primary occupational and environmental health concern associated with ethylene oxide (ETO) sterilization?
- Contribution to stratospheric ozone depletion
- Contamination of facility water supply from ETO runoff
- ETO is a known carcinogen and poses toxicity risks to healthcare workers through inhalation (Correct answer)
- Extremely high energy consumption compared to other sterilization methods
Correct answer: ETO is a known carcinogen and poses toxicity risks to healthcare workers through inhalation
ETO is classified as a human carcinogen and reproductive hazard; strict engineering controls, personal protective equipment, and OSHA exposure limits exist specifically to protect sterilization personnel.
Question 6: Which organization publishes the sterilization standards (e.g., ST79, ST58) most commonly referenced for flexible endoscope reprocessing in U.S. healthcare facilities?
- OSHA (Occupational Safety and Health Administration)
- CDC (Centers for Disease Control and Prevention)
- AAMI (Association for the Advancement of Medical Instrumentation) (Correct answer)
- APIC (Association for Professionals in Infection Control and Epidemiology)
Correct answer: AAMI (Association for the Advancement of Medical Instrumentation)
AAMI publishes technical standards such as ST79 (steam sterilization), ST58 (chemical sterilization), and ST91 (flexible endoscope reprocessing) that are the authoritative references for U.S. sterile processing.
Question 7: Before transitioning a flexible endoscope from high-level disinfection to sterilization, which consideration is MOST critical?
- Performing a cost-benefit analysis comparing the two reprocessing methods
- Verifying that the endoscope's manufacturer IFU clears the intended sterilization method (Correct answer)
- Surveying clinical staff preference for the new sterilization method
- Calculating total cycle time to ensure adequate scope turnaround between cases
Correct answer: Verifying that the endoscope's manufacturer IFU clears the intended sterilization method
Sterilizing an endoscope using a method not validated and cleared by the manufacturer constitutes off-label use and may damage the scope, void the warranty, and create patient safety liability.
CER Endoscope Sterilization Methods Questions and Answers 5
An endoscope manufacturer's IFU states the scope is NOT compatible with ETO sterilization.
What is the MOST likely reason?