CBSPD - Certification Board for Sterile Processing and Distribution Sterilization Principles and Methods Questions and Answers — Questions and Answers
Question 1: A Sterile Processing technician is preparing a heat-sensitive, lumened device for low-temperature sterilization. Which of the following sterilization methods would be MOST appropriate?
- Dry Heat
- Steam Autoclave
- Hydrogen Peroxide Gas Plasma (Correct answer)
- Peracetic Acid
Correct answer: Hydrogen Peroxide Gas Plasma
Hydrogen Peroxide Gas Plasma sterilization is a low-temperature method suitable for heat-sensitive and moisture-sensitive items. The process uses hydrogen peroxide vapor and plasma to effectively sterilize complex instruments, including those with long lumens. Steam and dry heat are high-temperature methods that would damage the device. Peracetic acid is a liquid chemical sterilization method, which may not be ideal for complex lumened devices and requires specific immersion equipment.
Question 2: What are the four critical parameters of steam sterilization that must be met to ensure sterility?
- Time, Temperature, Aeration, and Gas Concentration
- Time, Temperature, Pressure, and Steam Quality (Correct answer)
- Pressure, Humidity, Aeration, and Time
- Temperature, Humidity, Gas Concentration, and Pressure
Correct answer: Time, Temperature, Pressure, and Steam Quality
The effectiveness of steam sterilization depends on the precise control of four parameters: time, temperature, pressure, and the quality of the steam (specifically, saturated steam). All four must be present at the proper levels for the specified duration to kill microorganisms.
Question 3: A biological indicator (BI) for a steam sterilization load is incubated and shows no growth. The control BI, which was not processed, shows growth. What is the correct interpretation of these results?
- The sterilization cycle failed, and the load must be reprocessed.
- The incubator is malfunctioning.
- The sterilization cycle was successful, and the load can be released. (Correct answer)
- The biological indicators were expired.
Correct answer: The sterilization cycle was successful, and the load can be released.
A successful steam sterilization cycle is indicated when the processed biological indicator shows no microbial growth after incubation, while the unprocessed control BI shows growth. This confirms that the sterilizer's conditions were sufficient to kill the highly resistant spores on the test BI and that the spores and incubation conditions were valid.
Question 4: Which of the following packaging materials is incompatible with steam sterilization?
- Woven textiles
- Paper-plastic pouches
- Rigid sterilization containers
- Tyvek pouches (Correct answer)
Correct answer: Tyvek pouches
Tyvek (a brand of flashspun high-density polyethylene fibers) is a plastic material that cannot withstand the high temperatures of steam sterilization and will melt. It is, however, compatible with low-temperature sterilization methods like ethylene oxide (EtO) and hydrogen peroxide gas plasma. Woven textiles, paper-plastic pouches, and rigid containers are all designed for use in steam autoclaves.
Question 5: During an Ethylene Oxide (EtO) sterilization cycle, which parameter is critical for allowing the gas to effectively alkylate the microorganisms' DNA?
- Bright lighting
- Deep vacuum
- Low temperature
- Proper humidity (Correct answer)
Correct answer: Proper humidity
The four essential parameters for Ethylene Oxide (EtO) sterilization are gas concentration, temperature, exposure time, and relative humidity. Humidity is critical because water molecules act as a carrier, transporting the EtO molecules to the reactive sites on the microorganisms, thus enabling the alkylation process that disrupts their DNA and kills them.
Question 6: A Type 5 chemical indicator is placed inside a wrapped instrument tray. What does this indicator verify?
- That the package has simply been exposed to a sterilization process.
- The air removal efficiency of a dynamic-air-removal sterilizer.
- That all critical parameters of the sterilization cycle have been met. (Correct answer)
- The sterility of the items inside the package post-sterilization.
Correct answer: That all critical parameters of the sterilization cycle have been met.
A Type 5 chemical indicator, also known as an integrating indicator, is designed to react to all critical parameters (e.g., time, temperature, and steam) of a specific sterilization cycle. A passing result provides a high level of assurance that the conditions for sterilization were achieved within the package. Type 1 indicators only show exposure, and Type 2 (Bowie-Dick) test for air removal. No chemical indicator can guarantee the sterility of an item, which is the role of a biological indicator.
CBSPD - Certification Board for Sterile Processing and Distribution Sterilization Principles and Methods Questions and Answers
A Sterile Processing technician is preparing a heat-sensitive, lumened device for low-temperature sterilization.
Which of the following sterilization methods would be MOST appropriate?