- Certified Medical Device Reprocessing Technician Steam Sterilization Principles Questions and Answers Flashcards

What is superheated steam and why is it problematic for sterilization?

Answer: Superheated steam has been heated beyond its saturation temperature and behaves like hot air, lacking the latent heat energy needed for effective microbial kill

Saturated steam releases its latent heat energy when it condenses on surfaces, which is essential for microbial kill. Superheated steam does not condense readily and transfers heat less efficiently, similar to dry hot air.

What is the relationship between pressure and temperature in steam sterilization?

Answer: In saturated steam, pressure and temperature are directly related — increasing pressure raises the boiling point and thus the steam temperature, which is how sterilization temperatures above 100°C are achieved

Steam sterilization operates in a sealed, pressurized chamber. By increasing the pressure above atmospheric, the boiling point of water increases, producing steam at temperatures well above 100°C — the temperatures needed for rapid sterilization.

What factors can cause a wet pack after a sterilization cycle?

Answer: Overloading the sterilizer, packages touching cold chamber walls, inadequate drying time, poor steam quality, or improper loading patterns

Wet packs result from condensation that fails to evaporate during the drying phase. Multiple factors contribute, including excessive load mass (too much condensation), cold surfaces causing extra condensation, insufficient drying time, and poor steam quality.

What is the purpose of the conditioning phase in a prevacuum sterilizer?

Answer: To remove air from the chamber through alternating vacuum pulls and steam pulses, ensuring complete steam penetration to all surfaces

The conditioning phase uses multiple cycles of vacuum (pulling air out) and steam injection (displacing remaining air) to achieve thorough air removal. Trapped air is the primary enemy of steam sterilization as it prevents steam contact.

What is the difference between a Type 5 (integrating) and Type 6 (emulating) chemical indicator?

Answer: A Type 5 integrates all critical parameters and is designed to correlate with BI performance, while a Type 6 is designed to react to all critical parameters of a specific sterilization cycle type

Type 5 integrating indicators respond to all critical sterilization parameters with stated values that correlate with BI kill, making them versatile across cycle types. Type 6 emulating indicators are cycle-specific, designed to respond to the exact parameters of one particular cycle.

What is an immediate-use steam sterilization (IUSS) cycle and what are its limitations?

Answer: A shortened sterilization cycle used for cleaned but unpackaged instruments needed urgently, with significant limitations including no sterile barrier for storage or transport

IUSS (formerly flash sterilization) uses shorter cycle parameters for unpackaged instruments needed immediately. It should only be used when no sterile alternative is available, never for convenience or routine use.