Bedsores are caused by localized?

ESIC Nursing Officer 2016 (shift-1)

Medical & Surgical Nursing

Easy

Appeared in: ESIC Nursing Officer 2016 (shift-1)

Explanation

Bedsores, also known as pressure injuries, are fundamentally caused by localized ischemia.
This occurs when prolonged pressure on the skin, typically over a bony prominence, exceeds the pressure within the capillaries, obstructing blood flow.
The resulting lack of oxygen and nutrients (ischemia) leads to cell death, tissue damage, and the formation of an ulcer.

Option B: A contusion is a bruise resulting from acute blunt force trauma that ruptures blood vessels, not from the sustained, unrelieved pressure that causes bedsores.
Option C: Excess heat causes a thermal burn by directly damaging cells through high temperatures. This is a different mechanism of injury compared to the pressure-induced mechanism of bedsores.
Option D: Friction is a significant contributing factor that damages the outer layer of the skin (epidermis), but it is not the primary cause. The core pathology of deep tissue death in a bedsore is ischemia from pressure.

Visual 1: Diagram: Pathophysiology of a pressure injury. This visual should illustrate how external pressure on a bony prominence compresses blood vessels, leading to ischemia and tissue necrosis.
Visual 2: Infographic: The stages of pressure injuries. This should provide visual depictions and key characteristics of Stage 1, 2, 3, 4, Unstageable, and Deep Tissue injuries.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pathophysiology of pressure injuries (bedsores) as background academic context rather than a clinical decision trigger.
Nurses are at the forefront of preventing pressure injuries through regular risk assessment (e.g., using the Braden Scale), frequent repositioning of immobile patients (at least every 2 hours), and the use of pressure-relieving surfaces.
Key nursing interventions include maintaining skin hygiene, managing moisture, and ensuring adequate nutrition and hydration to improve the tissue's tolerance to pressure.
What if? If a patient has peripheral vascular disease or diabetes, their baseline circulation is already compromised. This significantly increases their risk, meaning a pressure injury can develop more quickly and with less pressure than in a healthy individual, requiring even more vigilant preventive care.

How to Approach the Question

First, identify the core concept of the question, which is the fundamental cause of bedsores.
This is a factual recall question based on pathophysiology. Your goal is to select the primary mechanism of injury.
Analyze the options provided: Ischemia (lack of blood flow), Contusion (bruise), Excess heat (burn), and Friction (rubbing).
Recall that bedsores typically form over bony prominences in patients who are immobile. This is due to sustained pressure cutting off circulation.
Connect the concept of 'cutting off circulation' to its correct medical term, which is 'ischemia'.
Differentiate the primary cause (ischemia) from contributing factors (friction) and unrelated causes (contusion, heat) to arrive at the most accurate answer.

Concept Tested & Keywords

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