Certified Nurses Operating Room (CNOR) Practice Exam

What are the required parameters for ETO ethylene oxide sterilization effectiveness?

1. Time, temp, concentration, humidity

2. Pressure, time, radiation

3. Humidity, temperature, chemical concentration

4. Time, pressure, and chemical change

The correct answer is: Time, temp, concentration, humidity

Ethylene oxide (ETO) sterilization is a critical process used to sterilize heat-sensitive medical instruments and materials. The effectiveness of ETO sterilization relies on several key parameters, which include time, temperature, concentration of the gas, and humidity. Time is crucial because ETO requires a specific duration to effectively penetrate materials and kill microorganisms. The temperature at which the sterilization occurs also plays a significant role, as higher temperatures can enhance the rate of microbial destruction but must be balanced with the materials being sterilized to avoid damage. The concentration of ethylene oxide must be maintained at an effective level to ensure sufficient sterilizing power. Lastly, humidity is important because moisture in the environment helps to activate the ETO, facilitating its ability to penetrate and sterilize effectively. These parameters work together, and their appropriate balance is essential for achieving reliable sterilization outcomes. This understanding is crucial for certified nurses operating in the surgical environment, where sterilization processes impact patient safety and surgical success.