HSPA Endoscope Reprocessing 2 — Questions and Answers
Question 1: After high-level disinfection, what must be used to rinse endoscope channels before drying?
- Tap water
- Sterile water or filtered water meeting specific quality standards (Correct answer)
- Saline solution
- The same disinfectant at a diluted concentration
Correct answer: Sterile water or filtered water meeting specific quality standards
Sterile, filtered, or bacteria-free rinse water must be used after high-level disinfection to prevent recontamination. Tap water may contain waterborne microorganisms such as Pseudomonas that could colonize the channels. The rinse water quality is critical to maintaining the disinfection achieved.
Question 2: What is the primary purpose of an automated endoscope reprocessor (AER)?
- To eliminate the need for manual cleaning
- To standardize the high-level disinfection or liquid chemical sterilization process (Correct answer)
- To sterilize endoscopes for surgical use
- To replace the leak testing step
Correct answer: To standardize the high-level disinfection or liquid chemical sterilization process
AERs standardize and automate the high-level disinfection cycle, ensuring consistent chemical contact, temperature, and time. However, manual cleaning must still be performed before placing the scope in the AER. The AER does not replace any pre-cleaning or manual cleaning steps.
Question 3: How should a reprocessed endoscope be stored to minimize contamination risk?
- Coiled in its carrying case with all valves attached
- Hung vertically in a well-ventilated drying cabinet with valves removed (Correct answer)
- Placed flat on a clean surface in a drawer
- Wrapped in a sterile towel inside a closed container
Correct answer: Hung vertically in a well-ventilated drying cabinet with valves removed
Endoscopes should be stored vertically in a ventilated cabinet with valves and caps removed to promote drying and air circulation. Residual moisture in channels creates an environment for microbial growth. Proper storage significantly reduces the risk of recontamination between uses.
Question 4: What does the term 'biofilm' refer to in the context of endoscope reprocessing?
- A protective plastic coating applied to new endoscopes
- A community of microorganisms encased in a self-produced matrix that adheres to surfaces (Correct answer)
- A chemical residue left by enzymatic detergents
- A type of biological indicator used in sterility testing
Correct answer: A community of microorganisms encased in a self-produced matrix that adheres to surfaces
Biofilm is a structured community of microorganisms that produce an extracellular polymeric substance allowing them to adhere firmly to surfaces, including endoscope channels. Once formed, biofilm is extremely resistant to disinfectants and can harbor dangerous pathogens. Prevention through prompt and thorough cleaning is essential.
Question 5: When should a leak test be performed during endoscope reprocessing?
- After high-level disinfection
- Before manual cleaning but after bedside pre-cleaning (Correct answer)
- Only when visible damage is detected
- After the endoscope is placed in the AER
Correct answer: Before manual cleaning but after bedside pre-cleaning
Leak testing must be performed after bedside pre-cleaning but before full immersion and manual cleaning. This sequence prevents further damage to a compromised scope during submersion. If the leak test fails, the scope should not be submerged and must be sent for repair.
Question 6: Which chemical is commonly used as a high-level disinfectant for flexible endoscopes?
- Isopropyl alcohol 70%
- Sodium hypochlorite (household bleach)
- Ortho-phthalaldehyde (OPA) (Correct answer)
- Hydrogen peroxide 3%
Correct answer: Ortho-phthalaldehyde (OPA)
Ortho-phthalaldehyde (OPA) at 0.55% concentration is a widely used high-level disinfectant for flexible endoscopes. It offers advantages including no activation required, minimal odor compared to glutaraldehyde, and excellent material compatibility. It has a shorter contact time than glutaraldehyde at room temperature.
HSPA Endoscope Reprocessing 2
After high-level disinfection, what must be used to rinse endoscope channels before drying?