Endoscopy is sterilized by?

Appeared in: BSF Staff Nurse - 2021

Explanation

Endoscopes are classified as semi-critical devices because they contact mucous membranes.
Semi-critical devices that are sensitive to heat (like endoscopes) cannot be autoclaved and require high-level disinfection (HLD).
2% glutaraldehyde is a chemical sterilant that provides HLD, effectively killing a broad spectrum of microbes without damaging the delicate endoscope.
This method is standard practice for reprocessing flexible endoscopes.

Option B: Alcohol is an intermediate-level disinfectant. It is not sporicidal and does not meet the requirements for high-level disinfection needed for semi-critical items like endoscopes. It can also damage certain materials on the scope.
Option C: Sodium hypochlorite (bleach) is a powerful disinfectant but is highly corrosive to the metals, plastics, and rubber components of a flexible endoscope, causing irreversible damage.
Option D: This option is incorrect because alcohol and sodium hypochlorite are not appropriate for disinfecting endoscopes due to material incompatibility and an insufficient level of disinfection.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain High-level disinfection for semi-critical medical devices as background academic context rather than a clinical decision trigger.
Proper endoscope reprocessing is a critical patient safety issue. Failure to follow correct HLD protocols can lead to the transmission of serious healthcare-associated infections (HAIs) between patients.
Nurses are often responsible for initiating the pre-cleaning process at the bedside and ensuring the scope is transported for reprocessing correctly. Understanding the entire process is vital for infection control.
What if the item was a stainless steel surgical scalpel? As a 'critical' item that enters sterile tissue, it would require full sterilization, typically using steam under pressure (autoclaving), not just HLD with glutaraldehyde.

How to Approach the Question

First, identify the medical device in the question: an endoscope.
Next, classify the device using the Spaulding classification. An endoscope touches mucous membranes, making it a 'semi-critical' item.
Recall the required level of processing for a semi-critical item. It needs, at minimum, High-Level Disinfection (HLD). Also, consider the device's material; endoscopes are heat-sensitive.
Evaluate the options. Which agent provides HLD and is safe for heat-sensitive scopes?
Eliminate options that are inappropriate: Sodium hypochlorite is corrosive, and alcohol provides an insufficient level of disinfection. This leaves 2% glutaraldehyde as the correct choice.

Concept Tested & Keywords

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E6 Pharmacology Katzung 16e p. 1397-1399

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

Practise the full BSF Staff Nurse - 2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.