CER Endoscope Sterilization Methods 2

Question 1

Which sterilization method uses peracetic acid as the active sterilant for heat-sensitive endoscopes?

Accepted Answer

STERIS System 1E

Answer

The STERIS System 1E uses liquid peracetic acid at approximately 50°C to sterilize heat-sensitive endoscopes.

Question 2

What is the minimum concentration of peracetic acid required for sterilization in the STERIS System 1E?

Accepted Answer

0.35%

Answer

The STERIS System 1E requires a minimum of 0.35% peracetic acid concentration to achieve sterilization.

Question 3

Ethylene oxide sterilization requires which post-sterilization step before an endoscope is safe to use?

Accepted Answer

Aeration to remove toxic residuals

Answer

EO-sterilized items must undergo aeration to allow toxic EO and its by-products (ethylene glycol, ethylene chlorohydrin) to dissipate to safe levels.

Question 4

A flexible endoscope cannot withstand steam sterilization primarily because of:

Accepted Answer

Heat sensitivity of materials and adhesives

Answer

The high temperatures (121–134°C) of steam sterilization damage the heat-sensitive polymers, adhesives, and optical components used in flexible endoscope construction.

Question 5

Vaporized hydrogen peroxide (VHP) sterilization is contraindicated for endoscopes with long narrow lumens because:

Accepted Answer

Hydrogen peroxide condenses and loses efficacy in narrow channels

Answer

VHP cannot reliably penetrate long, narrow lumens because the vapor condenses before reaching all surfaces, leaving areas unsterilized.

CER - Certified Endoscope Reprocessor Practice Test

CER - Certified Endoscope Reprocessor Practice Test

CER Endoscope Sterilization Methods 2