Glasswares and glass syringes are sterilized using?

NIA - 29 January 2023

Applied Microbiology & Infection control

Easy

Appeared in: NIA - 29 January 2023

Explanation

Hot air ovens use dry heat to sterilize materials, which is the preferred method for items that can be damaged by moisture or that must remain dry after sterilization.
Glassware and glass syringes are heat-resistant and are effectively sterilized by the high temperatures (160-180°C) achieved in a hot air oven.
The mechanism of action is oxidation of microbial cellular components, which ensures complete destruction of all microorganisms, including spores, with sufficient time and temperature.
Unlike autoclaving (moist heat), a hot air oven does not cause corrosion on sharp metal instruments that might be part of a syringe assembly.

Option A: An autoclave uses moist heat (steam under pressure). While effective for many items, it is not the preferred method for glassware that needs to remain completely dry or for substances like oils and powders that are impervious to steam.
Option B: Ethylene oxide (ETO) is a chemical gas used for sterilization. It is reserved for items that are sensitive to heat and/or moisture, such as plastics, electronic devices, and delicate instruments. It is unnecessary and more complex for simple glassware.
Option D: Irradiation (usually with gamma rays) is an industrial sterilization method used primarily for pre-packaged, single-use disposable items. It is not used for reprocessing reusable glassware in a clinical or laboratory setting.

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.
Understanding the correct sterilization method is critical for infection prevention and control. Using the wrong method can lead to instrument damage or failure to sterilize, posing a risk of healthcare-associated infections (HAIs).
Nurses must be able to differentiate between materials (glass vs. plastic, sharp metal vs. rubber) to ensure they are sent for the appropriate sterilization process, maintaining both patient safety and equipment integrity.
What if? If a plastic syringe were placed in a hot air oven instead of a glass one, it would melt and be destroyed, rendering it unusable and potentially damaging the oven. This highlights the importance of material compatibility.

How to Approach the Question

First, identify the key materials mentioned in the question: 'Glasswares' and 'glass syringes'.
Next, consider the properties of glass: it is resistant to high temperatures but can be sensitive to the rapid temperature and pressure changes of an autoclave, and it must often be completely dry for use.
Evaluate the options based on these properties. An autoclave uses moist heat, which may not be ideal. Ethylene oxide and irradiation are for heat-sensitive items, which glass is not.
A hot air oven uses dry heat, which is perfectly suited for heat-resistant materials like glass that need to remain dry.
Conclude that the hot air oven is the most appropriate method among the choices.

Concept Tested & Keywords

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