HSPA Sterilization Methods and Monitoring 2 — Questions and Answers
Question 1: What are the standard parameters for prevacuum steam sterilization of wrapped instruments?
- 121°C for 15 minutes
- 132°C (270°F) for 4 minutes exposure (Correct answer)
- 100°C for 30 minutes
- 140°C for 1 minute
Correct answer: 132°C (270°F) for 4 minutes exposure
Prevacuum cycles operate at 132°C with 4 minutes minimum exposure for wrapped non-porous items.
Total cycle time is 45-60 minutes including drying. The prevacuum system removes air before steam admission, enabling rapid and uniform penetration.
Question 2: What is the purpose of a process challenge device (PCD)?
- To test electrical systems
- To create defined resistance simulating the most challenging items, providing rigorous testing of sterilization (Correct answer)
- To check water quality
- To measure tray weight
Correct answer: To create defined resistance simulating the most challenging items, providing rigorous testing of sterilization
A PCD creates a standardized challenge at least as difficult as the most challenging items in the load.
PCDs typically contain a BI within a resistive barrier. If sterilant can penetrate the PCD, it provides confidence that less challenging items were also sterilized.
Question 3: How do Class 6 emulating indicators differ from Class 5 integrating indicators?
- Class 6 is less accurate
- Class 6 responds to one specific cycle; Class 5 responds across a range of cycle types and correlates with BI performance (Correct answer)
- They are identical
- Class 6 only works with ETO
Correct answer: Class 6 responds to one specific cycle; Class 5 responds across a range of cycle types and correlates with BI performance
Class 6 is cycle-specific; Class 5 works across multiple cycle types and correlates with biological indicator kill.
Class 5 is more versatile and commonly recommended for routine use. Both are used as internal package indicators.
Question 4: What records must be maintained for each sterilization cycle?
- Only date and time
- Complete documentation including date, time, sterilizer ID, cycle number, load contents, physical parameters, operator, and monitoring results (Correct answer)
- Only BI results
- Records only needed for implants
Correct answer: Complete documentation including date, time, sterilizer ID, cycle number, load contents, physical parameters, operator, and monitoring results
Every cycle must have complete documentation creating an audit trail for quality assurance and recall tracing.
Records must be maintained for 3-7 years minimum and be readily retrievable for regulatory surveys. Electronic systems can automate much of this documentation.
Question 5: What is the significance of the drying phase in steam sterilization?
- Optional for convenience
- Wet packages allow microbial migration through packaging, compromising sterility (Correct answer)
- Only prevents rust
- Further sterilizes items
Correct answer: Wet packages allow microbial migration through packaging, compromising sterility
Residual moisture creates a pathway for microorganisms to wick through packaging (strike-through).
The drying phase uses post-vacuum to evaporate moisture, typically 20-30 minutes. Factors causing wet packs include overloading, inadequate dry time, and contact with cold chamber walls.
Question 6: When must BI results be available for implantable device loads?
- Not required for implants
- Before the implant is used, requiring rapid-readout BIs with 1-3 hour results (Correct answer)
- Next day is fine
- Only chemical indicators needed
Correct answer: Before the implant is used, requiring rapid-readout BIs with 1-3 hour results
BI results should be available before implant use, necessitating rapid-readout biological indicators.
Rapid-readout BIs detect enzyme activity within 1-3 hours. If rapid BI unavailable and implant urgently needed, the surgeon must be informed that results are pending.
HSPA Sterilization Methods and Monitoring 2
What are the standard parameters for prevacuum steam sterilization of wrapped instruments?