Endoscope tube is sterilized by:
**Core Concept**
The sterilization of endoscopes is crucial to prevent the transmission of infectious diseases, such as endocarditis, to patients undergoing endoscopic procedures. This requires the use of a process that can inactivate a wide range of microorganisms, including bacteria, viruses, and spores.
**Why the Correct Answer is Right**
The correct answer is ethylene oxide gas sterilization. This process involves exposing the endoscope to a gas that penetrates all surfaces, including those with complex geometries, and inactivates microorganisms through alkylation of DNA and proteins. Ethylene oxide is particularly effective against spores, which are highly resistant to other sterilization methods. The process typically involves a combination of heat, humidity, and gas circulation to ensure thorough penetration and inactivation of microorganisms.
**Why Each Wrong Option is Incorrect**
**Option A:** Glutaraldehyde is a disinfectant often used to clean endoscopes, but it is not a sterilant. It can inactivate bacteria and viruses but may not be effective against spores.
**Option B:** Autoclaving is a method of sterilization that uses high-pressure steam to kill microorganisms. However, it is not suitable for endoscopes due to the risk of damage to the delicate instruments and the inability to penetrate complex geometries.
**Option C:** UV light is a disinfectant that can be used to reduce microbial load on surfaces. However, it is not a substitute for sterilization and may not be effective against all types of microorganisms.
**Clinical Pearl / High-Yield Fact**
Remember that sterilization of endoscopes requires a validated process that can inactivate a wide range of microorganisms, including spores. Ethylene oxide gas sterilization is a reliable method that can ensure the safety of patients undergoing endoscopic procedures.
**Correct Answer: C. Ethylene oxide gas sterilization.**