The best method of sterilizing catheters is?

RUHS, Jaipur, PB B.Sc Nursing Entrance-2021

Applied Microbiology & Infection control

Medium

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2021

Explanation

Catheters are classified as critical items because they enter sterile body cavities or the vascular system, requiring them to be fully sterilized.
They are typically made of heat-sensitive materials like plastic or rubber, which rules out heat-based sterilization methods like autoclaving or hot air ovens.
Radiation, specifically gamma radiation, is a 'cold' sterilization method that effectively penetrates packaging to sterilize disposable, heat-sensitive items without damaging them.
It is the standard industrial method for pre-packaged, single-use medical devices like catheters, syringes, and IV sets.

Option B: Hot air sterilization operates at 160–180°C, which would melt or destroy plastic or rubber catheters.
Option C: Ultraviolet (UV) rays have poor penetrating power and can only disinfect surfaces directly exposed to the light. It cannot sterilize an item like a catheter, especially one inside a package.
Option D: Boiling is a method of disinfection, not sterilization, because it does not reliably kill all bacterial spores. The heat can also damage or deform the catheter.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Sterilization methods for medical equipment as background academic context rather than a clinical decision trigger.
Nurses must always use sterile technique when handling critical items like urinary or intravascular catheters to prevent healthcare-associated infections (HAIs), such as CAUTI and CLABSI.
It is a critical nursing responsibility to check the integrity of the packaging, the sterility indicator, and the expiration date before using any pre-sterilized item. If the package is compromised, the item is considered non-sterile.
What if a nurse needs to sterilize a reusable heat-sensitive item like a flexible endoscope? The nurse would not use radiation or hot air. Instead, the item would be sent for high-level disinfection or sterilization using methods like ethylene oxide (ETO) gas or chemical sterilants (e.g., glutaraldehyde, peracetic acid) as per facility protocol.

How to Approach the Question

First, identify the object to be sterilized: a catheter.
Next, recall the material properties of a catheter. They are typically made of plastic or rubber, which are heat-sensitive.
Evaluate each option based on its mechanism and suitability for heat-sensitive materials.
Eliminate 'Hot air sterilization' and 'Boiling' as they involve high temperatures that would damage the catheter.
Eliminate 'By ultraviolet rays' because it has poor penetration and is only suitable for surface disinfection, not for a packaged medical device.
This leaves 'Radiation' as the only viable option for sterilizing a packaged, heat-sensitive item on an industrial scale.

Concept Tested & Keywords

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