Which is correct statement regarding autoclaving?

Appeared in: RML Lucknow - 2021

Explanation

Autoclaving operates on the principle of using saturated steam (moist heat) under high pressure.
The high pressure inside the autoclave chamber raises the boiling point of water, allowing the steam to reach a temperature of 121°C.
This high-temperature moist heat is highly effective at penetrating materials and killing all microorganisms, including resistant bacterial spores, by denaturing their proteins.

Option A: This is incorrect. Autoclaving uses moist heat (steam), not dry heat. Dry heat sterilization is a different method, typically performed in a hot air oven.
Option B: This is incorrect on two counts. Autoclaving uses moist heat, not dry heat, and it relies on high pressure, not low pressure, to achieve sterilizing temperatures.
Option D: This is incorrect. While autoclaving does use moist heat, it requires high pressure to raise the steam's temperature to a level sufficient for sterilization (121°C). Low pressure would not achieve the necessary temperature to kill resistant spores.

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.
Proper autoclaving is a cornerstone of infection control in hospitals, preventing healthcare-associated infections (HAIs) by ensuring that surgical instruments and other critical items are sterile.
Nurses play a vital role in the sterilization process, including preparing items for autoclaving, loading the machine correctly, and verifying that each cycle was successful using chemical and biological indicators.
What if? If an autoclave cycle fails to reach the required pressure and temperature, the items inside are not considered sterile. They must be reprocessed completely to prevent the risk of transmitting infections to patients.

How to Approach the Question

First, identify the key term in the question, which is 'autoclaving'.
Recall the fundamental principle of how an autoclave works. It's a common piece of hospital equipment, often compared to a pressure cooker.
The two main components of its operation are the type of heat and the pressure level.
Evaluate each option based on these two components. Autoclaves use steam, which is 'moist heat'. This eliminates the 'dry heat' options.
Consider the role of pressure. To get steam hotter than 100°C, you need 'high pressure'. This eliminates the 'low pressure' option.
Select the option that correctly combines 'moist heat' and 'high pressure'.

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

E6 Microbiology OneStop Sastry p. 50-52

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