Sterilization by steam under pressure is called?

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

Explanation

Autoclaving is the specific term for sterilization using saturated steam under pressure.
The high pressure allows the steam to reach temperatures (typically 121°C or higher) that are lethal to all microorganisms.
This method is highly effective because the moist heat rapidly denatures essential proteins and enzymes in microbes, including resilient bacterial spores.

Option A: This is a general term for any process that destroys all microbial life. The question asks for the specific name of a method.
Option C: A hot air oven uses dry heat for sterilization, not steam under pressure.
Option D: Boiling uses moist heat at 100°C but without pressure. It does not reliably kill bacterial spores and is therefore considered disinfection, not sterilization.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Methods of Sterilization as background academic context rather than a clinical decision trigger.
Nurses are responsible for ensuring that surgical instruments and other critical items are properly sterilized. Understanding the principles of autoclaving is fundamental to preventing surgical site infections (SSIs).
Proper loading of an autoclave is crucial for effective sterilization. Items must be arranged loosely to allow for complete steam penetration and air removal. Overloading or dense packing can create cool air pockets where sterilization fails.
Monitoring of each autoclave cycle is mandatory. This includes checking physical monitors (time, temperature, pressure gauges), using chemical indicators on every pack, and performing periodic biological indicator tests (spore tests) to validate the autoclave's efficacy.

How to Approach the Question

First, identify the key phrases in the question stem: 'sterilization' and 'steam under pressure'.
This is a factual recall question that requires knowledge of different methods of microbial control.
Define 'sterilization' in your mind: a process that kills ALL microbial life, including spores.
Review the options and match the method to the description 'steam under pressure'.
Eliminate 'Sterilization' as it's a general term, not a specific method.
Differentiate the remaining heat-based methods: 'Boiling' (100°C, no pressure, disinfection), 'Hot air oven' (dry heat), and 'Autoclaving' (steam with pressure).

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) pp. 126-128, 127-129

E6 Nursing Fundamentals Potter Perry 12e Part 2 p. 231-233

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