The substances that cause tissue necrosis and damage, particularly when extravasated, are?

AIIMS Raipur NO - 2017 (Shift-1)

Pharmacology

Easy

Appeared in: AIIMS Raipur NO - 2017 (Shift-1)

Explanation

Vesicants are chemical agents that cause severe tissue damage, inflammation, and necrosis when they extravasate, or leak, into subcutaneous tissues.
This is a well-defined classification for certain drugs, especially many antineoplastic (chemotherapy) agents like doxorubicin and vincristine.
The mechanism of injury involves the drug binding to cell DNA, causing cell death that can spread to adjacent tissues, leading to ulceration and severe damage to tendons, nerves, and blood vessels.
The term directly matches the description in the question stem, making it the most accurate answer.

Option A: Apoptosis is a natural, programmed, and controlled form of cell death essential for normal physiological processes. It is not a substance and is fundamentally different from the pathological, uncontrolled tissue death (necrosis) caused by an external injurious agent.
Option B: Interleukins are signaling proteins (cytokines) of the immune system. While they mediate inflammation, they are part of the body's response, not the external substance that causes the initial tissue damage and necrosis upon extravasation.
Option D: Retinoids are derivatives of vitamin A used primarily in dermatology. While they can cause local skin irritation, they are not classified as vesicants and do not cause the severe, deep-tissue necrosis associated with extravasation.

Visual 1: Image - A clinical photograph showing the stages of vesicant extravasation injury on a patient's arm, from initial swelling and redness to blistering and ulceration. This helps visualize the severity of the condition.
Visual 2: Flowchart - A diagram illustrating the step-by-step nursing management protocol for a suspected vesicant extravasation, from stopping the infusion to documentation.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of injurious agents (vesicants) and extravasation as background academic context rather than a clinical decision trigger.
Nurses administering intravenous (IV) medications, especially chemotherapy, must be competent in identifying vesicant drugs and managing extravasation, which is a medical emergency.
Prevention is key. This includes careful selection of IV sites (avoiding joints, the hand, or wrist), ensuring catheter patency before and during infusion, and educating the patient to report any pain or burning at the site immediately.
What if the extravasated drug was a non-vesicant irritant instead? The nurse would still stop the infusion and manage the site, but the risk of tissue necrosis is much lower. The response would involve managing local inflammation rather than preventing widespread tissue death, and an antidote is typically not required.

How to Approach the Question

First, analyze the question to identify the key concepts: 'substances', 'tissue necrosis' (tissue death), and 'extravasated' (leaked from a vessel).
The question is asking for the specific name of substances that have this damaging effect.
Evaluate each option based on this definition.
Option A, Apoptosis, is a process, not a substance. Eliminate it.
Option B, Interleukins, are internal signaling molecules, not external substances causing the initial damage. Eliminate it.
Option C, Vesicants, is a specific classification for drugs/substances that cause blistering and tissue damage on extravasation. This directly matches the question's description.

Concept Tested & Keywords

Concept Tested: Classification of injurious agents (vesicants) and extravasation
Stem keywords: substances, tissue necrosis, damage, extravasated
Lead-in keywords: are

QzyJxxC2u_RxvHFzHD5A2o