AIIMS Raipur - 2017 (…: To sterilize disposable syringes, the method of sterilization used is?

AIIMS Raipur - 2017 (shift-2)

Applied Microbiology & Infection control

Hard

Appeared in: AIIMS Raipur - 2017 (shift-2)

Explanation

Gamma radiation is a form of ionizing radiation that provides 'cold sterilization', meaning it does not use high heat.
Disposable syringes are made of plastic, which is heat-sensitive and would be damaged by heat-based sterilization methods.
Gamma rays have high penetrating power, allowing them to sterilize items even after they are sealed in their packaging, ensuring sterility until the point of use.
This method is effective in destroying all forms of microbial life, including bacteria, viruses, and spores.

Option A: Autoclaving uses high-pressure saturated steam at temperatures (121°C - 134°C) that would melt or deform the plastic components of a disposable syringe.
Option B: Infrared radiation is a method of dry heat sterilization, which uses even higher temperatures (160°C - 180°C) than autoclaving. This would destroy the plastic syringe.
Option C: Ultraviolet (UV) radiation has very poor penetrating power. It can only sterilize surfaces directly exposed to the light and cannot penetrate the syringe's plastic body or its packaging.

Visual 1: Diagram - A flowchart showing how to select a sterilization method based on the item's material (heat-stable vs. heat-sensitive) and intended use (critical, semi-critical, non-critical).
Visual 2: Infographic - Comparing the penetration power of Autoclave (steam), UV light, and Gamma radiation, showing gamma rays passing through a packaged syringe while others are blocked or only affect the surface.

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.
Using improperly sterilized equipment is a major cause of healthcare-associated infections (HAIs). Understanding the correct sterilization method for each device is a fundamental patient safety principle.
Nurses must verify the integrity of sterile packaging before use. A breach in packaging, regardless of the sterilization method, renders the item non-sterile.
What if? If a hospital only had an autoclave and needed to sterilize a heat-sensitive endoscope, the correct action would be to use a different, appropriate low-temperature method like Ethylene Oxide (ETO) gas or a chemical sterilant (e.g., glutaraldehyde), not to attempt autoclaving. This prevents equipment damage and ensures patient safety.

How to Approach the Question

First, identify the key components of the question: the item to be sterilized ('disposable syringes') and the process ('sterilize').
Recall or deduce the material of a disposable syringe. It is primarily made of plastic.
Consider the properties of plastic. It is heat-sensitive (thermolabile) and will melt or deform at high temperatures.
Evaluate each option based on this property:
Autoclave and Infra-red radiation use high heat, so they are unsuitable.
Ultraviolet radiation has poor penetration and cannot sterilize through packaging.

Concept Tested & Keywords

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