# A nurse is assessing a 78-year-old patient who has been bedridden for 5 days following hip fracture surgery. Which assessment finding would be the MOST concerning for pressure injury development?

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> subject: Adult Health

## 문제

A nurse is assessing a 78-year-old patient who has been bedridden for 5 days following hip fracture surgery. Which assessment finding would be the MOST concerning for pressure injury development?

## 보기

1. Skin temperature that is slightly cooler than surrounding tissue over the sacral area
2. Non-blanchable erythema over the coccyx that persists after position change **✔ 정답**
3. Mild skin dryness and flaking noted on bilateral lower extremities
4. Temporary redness over bony prominences that disappears within 30 minutes of repositioning

**정답: 2**

## 해설

Non-blanchable erythema over the coccyx that persists after position change indicates Stage 1 pressure injury, requiring immediate intervention. Other findings like cool skin, dryness, or temporary redness are less concerning as they represent normal variations or early reversible changes.

## 심화 해설

Correct Answer Analysis

The most concerning assessment finding for pressure injury development is non-blanchable erythema over the coccyx that persists after a position change. This finding indicates a Stage 1 pressure injury, which is the first clinically observable sign of tissue damage. In a non-blanchable lesion, the redness does not turn white when pressed because blood has leaked from damaged capillaries into the interstitial tissue, signaling that the ischemic threshold of the skin has been exceeded. For a 78-year-old patient who has been bedridden for 5 days after hip fracture surgery, this represents a critical turning point requiring immediate, intensified preventive intervention.

Why the Other Options Are Less Concerning

- Option 1 (Skin temperature slightly cooler than surrounding tissue): While a localized temperature change can reflect altered perfusion, it is a more subtle and less specific early indicator. The foundational research on skin physiology in bedridden older patients notes that changes in skin hydration and barrier function occur, but these are chronic alterations . A slight temperature decrease does not carry the same immediate diagnostic weight as observable, persistent erythema indicating capillary damage.

- Option 3 (Mild skin dryness and flaking on bilateral lower extremities): This finding reflects a general impairment in skin barrier function, specifically reduced hydration and sebum levels, which is a documented physiological change in the skin of bedridden older patients . While dry, flaking skin is a risk factor that compromises the skin's tensile strength and resistance to friction, it is a chronic condition affecting the entire skin surface, not an acute, localized sign of deep tissue ischemia over a bony prominence.

- Option 4 (Temporary redness that disappears within 30 minutes of repositioning): This describes blanchable erythema or reactive hyperemia. It is a normal, compensatory physiological response. When pressure is relieved, arterioles dilate to flush out accumulated metabolic waste and restore oxygen to the tissues, a process visible as temporary redness. This indicates that the body's autoregulatory mechanisms are intact and tissue ischemia has been reversed, making it an expected finding, not a sign of injury.

Pathophysiology of Pressure Injury Development

The progression from a normal response to a Stage 1 injury is a matter of ischemic duration and intensity. For a patient immobilized after hip surgery, the pressure exerted by the sacrum and coccyx against the bed continuously blocks blood flow to the compressed skin and underlying tissues. As described in the literature, this blockage prevents the delivery of oxygen and nutrients, leading to tissue hypoxia . The initial physiological response is reactive hyperemia (blanchable redness) upon pressure relief. However, if the ischemic insult is prolonged or repetitive, endothelial cells lining the capillaries become damaged. This damage increases vascular permeability, causing red blood cells and fluid to leak into the extravascular space. This leakage is the pathological basis of non-blanchable erythema; the redness is not just from dilated vessels but from blood that has escaped the compromised vessels and cannot be pushed away by external pressure.

Clinical Reasoning and Risk Factors

This patient's profile is a composite of high-risk factors. The hip fracture surgery directly limits mobility, making self-repositioning difficult or impossible, which is the primary etiological factor for prolonged unrelieved pressure . The patient's age of 78 years is also significant. Research comparing bedridden older patients to healthy individuals has demonstrated distinct alterations in skin physiological functions, including compromised barrier integrity measured by increased transepidermal water loss (TEWL) and altered pH . These age- and immobility-related changes make the skin intrinsically more fragile and less resilient to the effects of pressure, shear, and friction. The sacrum and coccyx are the most common sites for pressure injuries in this population because they bear the highest interface pressure in a supine or semi-Fowler's position, directly over a bony prominence with minimal subcutaneous tissue for padding.

Clinical Implications for Nursing Assessment

The distinction between blanchable and non-blanchable erythema is a fundamental skill in NCLEX-RN assessment and a cornerstone of pressure injury prevention protocols. A finding of non-blanchable erythema is not merely a risk factor; it is a diagnosis of a Stage 1 pressure injury. At this stage, the skin is intact, but the underlying tissue damage has already occurred. The nurse's immediate responsibilities must pivot from general prevention to both intensive local protection—to prevent progression to a Stage 2 or deeper ulcer—and a comprehensive re-evaluation of the patient's support surface, repositioning schedule, and nutritional status. This localized damage also creates a portal for microbial invasion, as the compromised tissue is highly susceptible to infection, which can lead to suppurative, non-healing wounds .

## 임상 시나리오

Clinical Guide: Assessing Early Pressure Injury in Immobile Patients

For a bedridden older adult, differentiating reactive hyperemia from a Stage 1 pressure injury is critical for timely intervention. Use this guide to standardize your skin assessment.

1. Identification: The Blanchability Test

Press your fingertip firmly over the area of erythema for 3 seconds, then release.

- **Blanchable (Reactive Hyperemia):** The skin turns white under your finger and redness returns immediately upon release. This is a normal response to pressure and typically resolves within 30-60 minutes of offloading.

- **Non-blanchable (Stage 1 Pressure Injury):** The redness persists and does not turn white under pressure. This indicates blood has leaked from damaged capillaries into the tissue and is the defining sign of a Stage 1 injury.

2. Key Assessment Parameters

In addition to blanchability, evaluate the following to confirm a Stage 1 injury versus other skin changes:

- **Temperature:** The area may feel warmer or cooler compared to surrounding skin. A slight temperature change alone is a subtle cue, but combined with non-blanchable erythema, it strengthens the diagnosis.

- **Consistency:** The tissue may feel boggy or firmer than the adjacent area due to underlying edema or induration.

- **Sensation:** The patient may report pain, itching, or burning at the site before visible changes appear. Always ask.

3. Immediate Nursing Actions

Upon identifying non-blanchable erythema, escalate preventive measures immediately to halt progression:

- **Strict Offloading:** Reposition the patient at least every 2 hours using a written schedule. Ensure the coccyx is completely free of pressure; use pillows or wedges to maintain a 30-degree lateral tilt.

- **Surface Upgrade:** Initiate a high-specification reactive foam mattress or an active alternating pressure surface if available. Do not use donut-type devices, which can cause venous congestion.

- **Skin Protection:** Apply a barrier film or a thin hydrocolloid dressing over the intact erythematous area to reduce friction and shear forces.

- **Documentation:** Document the exact location, size (length x width), color, and surrounding skin condition. Reassess at least every 8 hours.

4. Common Pitfall: Dryness vs. Injury

Mild skin dryness and flaking on the lower extremities reflect a chronic impairment in barrier function common in aging skin. This is managed with emollients and hydration. It is not an acute ischemic event and should not be confused with a pressure injury over a bony prominence.

## 핵심 개념

- **Non-blanchable Erythema** — Redness of the skin that does not turn white when pressed, indicating blood has leaked from damaged capillaries into interstitial tissue, a hallmark of Stage 1 pressure injury.
- **Reactive Hyperemia** — A temporary, blanchable redness over a bony prominence that resolves within 30-60 minutes of pressure relief, representing a normal compensatory vasodilation response.
- **Stage 1 Pressure Injury** — Intact skin with a localized area of non-blanchable erythema, often over a bony prominence, indicating the earliest visible sign of pressure damage.
- **Ischemic Threshold** — The point at which capillary blood flow is obstructed by external pressure for a sufficient duration, leading to tissue hypoxia and damage.

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