The following article should be sterilised by?

NORCET 3 - 2022 (Shift-2)

Applied Microbiology & Infection control (E5)

Medium

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

The item shown is a Foley catheter, made of heat-sensitive rubber or silicone. According to the Spaulding classification, as it enters a sterile body cavity (the bladder), it is a 'critical item' requiring sterilization.
Heat-sensitive critical items cannot be sterilized using heat-based methods like autoclaving, as the high temperatures would cause damage.
Glutaraldehyde is a high-level chemical disinfectant (often called a 'cold sterilant') that is specifically used for sterilizing heat-sensitive medical instruments like catheters, endoscopes, and respiratory equipment.
It effectively kills bacteria, viruses, fungi, and spores without damaging the rubber or plastic material of the device.

Option A: Autoclaving uses high-temperature steam (moist heat), which would melt, deform, or destroy the heat-sensitive rubber or silicone material of the Foley catheter.
Option B: UV radiation is a surface-level disinfectant and cannot penetrate the entire object. It would not sterilize the inner lumen or shadowed areas of the Foley catheter, making it ineffective.
Option C: Formalin (formaldehyde) is highly toxic, irritating, and a potential carcinogen. It is not used for sterilizing instruments that come into direct contact with patients due to the risk of toxic residue.

Visual 1: Flowchart: 'Choosing a Sterilization Method'. This would start with 'Is the item heat-sensitive?'. A 'Yes' branch would lead to chemical methods (Glutaraldehyde, ETO gas), and a 'No' branch would lead to heat methods (Autoclave).
Visual 2: Table: 'Comparison of Sterilization Methods'. This table would list Autoclave, Glutaraldehyde, ETO, and UV radiation, comparing their mechanism, advantages, disadvantages, and common applications.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Sterilization of heat-sensitive medical equipment as background academic context rather than a clinical decision trigger.
Proper sterilization of urinary catheters is critical to prevent Catheter-Associated Urinary Tract Infections (CAUTIs), a common and serious healthcare-associated infection (HAI).
Nurses must understand the properties of medical devices to ensure the correct disinfection or sterilization method is used, protecting patient safety and maintaining equipment integrity.
When working with chemical sterilants like glutaraldehyde, nurses must use appropriate Personal Protective Equipment (PPE), including gloves and eye protection, and ensure adequate ventilation to prevent exposure to hazardous fumes.

How to Approach the Question

First, identify the object in the image. It is a Foley catheter.
Next, determine the material of the object. Catheters are made of flexible materials like rubber or silicone, which are sensitive to heat.
Consider the classification of the item based on its use. A urinary catheter enters a sterile body part (the bladder), so it is a 'critical' item that must be sterilized.
Review the options provided. Evaluate each sterilization method based on its suitability for a heat-sensitive, critical item.
Eliminate autoclaving because it uses high heat. Eliminate UV radiation because it's only for surfaces. Eliminate formalin because it's too toxic for patient-use items.
Conclude that glutaraldehyde, a chemical sterilant, is the only appropriate method among the choices for a heat-sensitive catheter.

Concept Tested & Keywords

Concept Tested: Sterilization of heat-sensitive medical equipment
Stem keywords: sterilised, Foley catheter
Lead-in keywords: should be sterilised by
Clinical cues: The image shows a Foley catheter, which is made of a flexible, heat-sensitive material (rubber/silicone).

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