Name the chemical disinfectant which can be safely applied to living tissues to prevent infection?

Appeared in: NHM MP Staff Nurse-2022

Explanation

Antiseptics are, by definition, antimicrobial substances that are safe to apply to living tissue to reduce the possibility of infection.
They work by inhibiting the growth of or destroying microorganisms on the skin or in wounds.
Common examples used in healthcare include povidone-iodine for surgical site preparation and chlorhexidine for skin cleansing.

Option A: Ethylene oxide is a highly toxic and carcinogenic gas used for sterilizing medical equipment, not for application on living tissues.
Option B: Formaldehyde is a toxic and irritating chemical used for disinfecting inanimate objects and preserving tissues; it is harmful to living skin.
Option D: Mercuric chloride is a heavy metal compound that is highly toxic and unsafe for application on living tissues. Heavy metals are rarely used as disinfectants now due to toxicity and environmental concerns.

Clinical Relevance

Nursing practice connection: Knowing Antisepsis and Disinfection helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A fundamental nursing responsibility is to differentiate between antiseptics and disinfectants to ensure patient safety. Misusing a disinfectant on a patient's skin can lead to severe chemical burns, tissue damage, and systemic toxicity.
Proper aseptic technique, which includes using the correct skin antiseptic before invasive procedures like IV cannulation or surgery, is critical in preventing healthcare-associated infections (HAIs).
What if? If a nurse mistakenly used a formaldehyde-based solution to clean a patient's wound, it would cause immediate and severe tissue necrosis, a chemical burn, and intense pain. This would require urgent medical intervention, potentially including surgical debridement, and could lead to long-term scarring and complications.

How to Approach the Question

This is a factual recall question based on definitions.
First, identify the key phrase in the question stem: 'safely applied to living tissues'.
Next, analyze each option based on this key requirement.
Recall the specific definition of an 'antiseptic' as a substance used on living tissue and a 'disinfectant' as a substance used on inanimate objects.
Eliminate options that are known to be harsh chemicals used for sterilizing equipment or surfaces, such as Ethylene oxide and Formaldehyde.
The term 'Antiseptics' directly matches the function described in the question, making it the correct choice.

Concept Tested & Keywords

QRRCIUk2h30ZakFkgcdm75

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 128-130

E6 Pharmacology Katzung 16e pp. 1399-1401, 1398-1400

Practise the full NHM MP Staff Nurse-2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.