The earliest identifying sign for a developing pressure sore at skin is a localized:

Appeared in: BHU NO-2019

Explanation

The earliest sign of a Stage 1 pressure injury is a localized change in skin color.
In light-skinned individuals, this presents as non-blanchable erythema (redness that does not fade with pressure).
In dark-skinned individuals, the area may appear purplish, bluish, or a different shade than the surrounding skin, and may be warmer to the touch.
The skin remains intact, but this sign indicates underlying tissue injury from unrelieved pressure.

Option A: The affected area is typically warmer, not cooler, in the initial stage due to inflammation and increased blood flow (hyperemia).
Option C: Loss of sensation is a major risk factor for the development of pressure sores, not a physical sign of the sore itself.
Option D: While edema (swelling) can be present, it is not the earliest or most definitive sign. The change in color is the primary indicator.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Early identification of pressure ulcers as background academic context rather than a clinical decision trigger.
Early identification of Stage 1 pressure injuries is a critical nursing responsibility to prevent progression to more severe, open wounds (Stages 2-4), which are painful, costly, and increase the risk of infection.
Nurses must perform and document a thorough skin assessment using a validated tool like the Braden Scale on admission and at regular intervals for all at-risk patients.
What if? If the reddened area blanches (turns white) with pressure and then returns to red, it indicates reactive hyperemia, not a Stage 1 ulcer. This is a warning sign that pressure needs to be relieved, but it signifies that tissue damage has not yet occurred.

How to Approach the Question

First, identify the keyword in the question stem, which is "earliest." This directs you to look for the very first sign of a problem.
Recall the pathophysiology of pressure injuries: pressure obstructs blood flow, leading to tissue ischemia and an inflammatory response.
Consider how this process would manifest. The initial inflammatory response causes vasodilation, leading to redness (a change in color) and warmth.
Evaluate the options: 'Coolness' is opposite to the inflammatory response. 'Loss of sensation' is a cause or risk factor, not a sign of the injury itself. 'Edema' can occur, but the color change is the most immediate visible sign.
Therefore, a localized change in color is the most accurate answer for the earliest sign.

Concept Tested & Keywords

Concept Tested: Early identification of pressure ulcers
Stem keywords: earliest identifying sign, developing pressure sore, skin, localized
Lead-in keywords: earliest
Negative lead-in flag: false

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E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 70-72

E6 Nursing Brunner Adult Health 3SA Vol 2 Part 2 p. 108-110

Practise the full BHU NO-2019

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