RML 2023: Which is a correct statement regarding autoclaving?

RML 2023

Applied Microbiology & Infection control

Easy

Appeared in: RML 2023

Explanation

Autoclaving is a sterilization process that utilizes moist heat in the form of saturated steam.
The process is conducted under high pressure, which allows the steam to reach temperatures above the normal boiling point of water (typically 121°C).
This combination of high-temperature moist heat is extremely effective at killing all forms of microbial life, including highly resistant bacterial spores.
The mechanism of killing is the denaturation and coagulation of essential proteins within the microorganisms.

Option A: This is incorrect because autoclaving uses moist heat (steam), not dry heat. Dry heat sterilization is a separate method, typically performed in a hot air oven.
Option B: This is incorrect for the same reason as the first option; autoclaving relies on moist heat, not dry heat.
Option D: This is incorrect because autoclaving requires high pressure to raise the steam's temperature to the effective sterilization level of 121°C. Low pressure would not achieve this temperature.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Principle of Autoclaving as background academic context rather than a clinical decision trigger.
Autoclaving is the most common and reliable method of sterilization used in hospitals for surgical instruments, dressings, and other medical equipment to prevent healthcare-associated infections (HAIs).
Nurses are responsible for ensuring that equipment is properly prepared, loaded, and monitored during the autoclaving cycle. This includes using chemical and biological indicators to verify sterility.
What if? - If an autoclave fails to reach the required pressure (e.g., due to a leak in the door seal), it will also fail to reach the target temperature of 121°C. This would result in an incomplete sterilization cycle, and the items would not be sterile and must not be used on patients.

How to Approach the Question

First, identify the key term in the question, which is 'autoclaving'.
Recall the definition and fundamental principle of autoclaving from your knowledge of microbiology and infection control.
Analyze the options by breaking them down into two components: the type of heat (moist vs. dry) and the level of pressure (high vs. low).
Remember that 'auto' relates to self and 'clave' to key or lock, implying a sealed, pressurized chamber. Steam is water in its gaseous form (moist heat).
Eliminate the 'dry heat' options, as autoclaving is synonymous with steam sterilization.
Between the remaining 'moist heat' options, recall that pressure is increased to raise the temperature, so 'under pressure' (implying high pressure) is correct, and 'low pressure' is incorrect.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 127-129