Endoscopic catheters are sterilized by?

UPRVUNL - 2021

Applied Microbiology & Infection control

Medium

Appeared in: UPRVUNL - 2021

Explanation

Endoscopic catheters are classified as semi-critical items because they come into contact with mucous membranes.
These instruments are heat-sensitive due to their delicate optical fibers, electronic components, and plastic materials.
High-temperature sterilization methods like autoclaving would destroy the endoscope.
Therefore, chemical processing is required. 2% glutaraldehyde is a high-level disinfectant/chemical sterilant used for heat-sensitive equipment, capable of killing bacteria, viruses, fungi, and spores with adequate contact time.

Option B: Autoclaving uses high-pressure steam (moist heat), which would damage the heat-sensitive components of an endoscope.
Option C: Boiling water does not reach temperatures high enough to kill all microbial life, particularly bacterial spores. It is considered a method of disinfection, not sterilization, and is unsuitable for delicate instruments.
Option D: A hot air oven uses high-temperature dry heat (160-180°C), which would melt, warp, or otherwise destroy the plastic, rubber, and optical parts of an endoscopic catheter.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Sterilization and disinfection of medical instruments as background academic context rather than a clinical decision trigger.
Proper reprocessing of endoscopes is a critical patient safety issue. Failure to correctly disinfect or sterilize endoscopes is a known cause of healthcare-associated infections (HAIs), including outbreaks of multidrug-resistant organisms.
Nurses play a vital role in ensuring that protocols for instrument reprocessing are strictly followed, from pre-cleaning at the bedside to transport and documentation of the disinfection/sterilization cycle.
What if? If the instrument were a stainless steel surgical forceps used in an operation (a critical item), autoclaving would be the correct method because it must be sterile and is heat-tolerant.

How to Approach the Question

First, identify the object in question: an 'endoscopic catheter'.
Recall the physical properties of this object. Endoscopes are complex instruments with delicate, heat-sensitive components like lenses, fiber optics, and plastics.
Next, evaluate each option based on its mechanism. Autoclaving, boiling, and hot air ovens are all heat-based methods.
Eliminate the heat-based methods because they would damage the endoscope.
This leaves the chemical method, 2% glutaraldehyde, which is specifically designed for disinfecting and sterilizing heat-sensitive instruments.

Concept Tested & Keywords

QiafWR7YhqKXtUKHKx1C6E

E6 Nursing Fundamentals Potter Perry 12e Part 2 p. 231-233

E6 Pharmacology Katzung 16e p. 1397-1399

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 126-128