Out of the following, which is not a direct cause of bed sore in a patient?

GMCH Chandigarh - 2022

Medical Surgical Nursing

Easy

Appeared in: GMCH Chandigarh - 2022

Explanation

A drug reaction is an adverse response to a medication, which typically manifests as a systemic or localized rash, hives, or other dermatological conditions through immunological or non-immunological pathways.
This mechanism is fundamentally different from the cause of a bed sore, which is a localized injury resulting from mechanical pressure that obstructs blood flow and causes tissue necrosis.
While some drugs might affect skin integrity or circulation, the reaction itself is not the direct mechanical cause of a pressure injury.

Option B: Prolonged sitting or lying in the same position is a primary cause of bed sores. This immobility leads to sustained, unrelieved pressure on bony prominences, which is the main mechanism for tissue damage.
Option C: Poor circulation, or impaired tissue perfusion, is a major contributing factor. Tissues with compromised blood flow are more vulnerable to injury from pressure because they receive less oxygen and nutrients, accelerating the process of tissue breakdown.
Option D: Constant pressure is the direct and most significant cause of bed sores. When pressure on the skin exceeds the pressure that keeps capillaries open, blood flow stops, leading to ischemia and cell death.

Visual 1: Diagram: Illustrating how prolonged pressure on a bony prominence (like the sacrum or heel) compresses blood vessels, leading to tissue ischemia and the formation of a pressure injury.
Visual 2: Chart: The Braden Scale for Predicting Pressure Sore Risk, showing the key risk factors including mobility, activity, and perfusion.
Visual 3: Infographic: The stages of pressure injuries, from Stage 1 (non-blanchable redness) to Stage 4 (full-thickness tissue loss).

Clinical Relevance

Nursing practice connection: Use the key finding related to Etiology of Pressure Injuries (Bed Sores) to guide bedside assessment, documentation, and the next nursing action.
Pressure injury prevention is a key nursing quality indicator. Nurses are responsible for assessing risk using tools like the Braden scale and implementing preventative measures.
Key nursing interventions include frequent repositioning, meticulous skin care, ensuring proper nutrition, and using pressure-redistributing support surfaces.
Failure to prevent pressure injuries can lead to severe pain, infection, sepsis, and increased hospital stays for the patient.

How to Approach the Question

First, identify the negative keyword 'not' in the question. This means you are looking for the option that is an exception or does not fit with the others.
Recall the fundamental cause of bed sores (pressure injuries): prolonged, unrelieved pressure leading to tissue ischemia.
Evaluate each option based on this core concept.
Option A, 'Drug reaction', relates to an immunological or systemic response to a medication, which is a different pathophysiological process.
Options B, C, and D ('Prolonged position', 'Poor circulation', 'Constant pressure') are all directly related to the mechanical and circulatory mechanisms of pressure injury formation.
Conclude that the option unrelated to the core pathophysiology of pressure is the correct answer.

Concept Tested & Keywords

Concept Tested: Etiology of Pressure Injuries (Bed Sores)
Stem keywords: bed sore, direct cause
Lead-in keywords: not
Negative lead-in flag: The question asks to identify the option that is NOT a cause of bed sores.

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