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 and require immediate intervention to prevent pressure injury development?
The nurse is conducting a comprehensive skin assessment on a post-operative patient at high risk for pressure injury development.
1Blanching erythema over the sacral area that disappears within 30 seconds of pressure relief
2Non-blanching erythema over the coccyx that persists after pressure relief✓ 정답
3Dry, flaky skin on the lower extremities with mild scaling
4Slight skin discoloration around the surgical incision site
해설
Non-blanching erythema indicates Stage 1 pressure injury requiring immediate intervention, while blanching erythema is a normal response. Other findings are less urgent.
Clinical Context
A 78-year-old patient who is bedridden for 5 days after hip fracture surgery is at extreme risk for pressure injury development. The combination of advanced age, immobility, and the acute inflammatory response to surgery and trauma creates a perfect storm for tissue ischemia. The nurse's comprehensive skin assessment must differentiate between benign reactive hyperemia and the earliest visible sign of irreversible tissue damage.
Correct Answer Analysis
The most concerning finding is non-blanching erythema over the coccyx that persists after pressure relief. This finding represents Stage 1 pressure injury and indicates that tissue damage has already occurred at the cellular level.
The pathophysiological basis for this concern is rooted in the current etiopathogenesis model of pressure injuries [1]. When sustained pressure exceeds capillary closing pressure (typically around 32 mmHg) for a sufficient duration, it leads to occlusion of the microcirculation. This triggers a cascade beginning with localized ischemia. If pressure is relieved quickly, the body responds with reactive hyperemia—vasodilation that brings a rush of oxygenated blood to the area, visible as blanching erythema. This is a compensatory, reversible response.
However, when ischemic insult continues or is repeated, endothelial cells lining the capillaries become damaged. Reperfusion, while necessary, paradoxically worsens injury through the generation of reactive oxygen species and an inflammatory response. This ischemia-reperfusion injury damages the capillary basement membrane, causing increased vascular permeability. Erythrocytes and inflammatory cells leak into the interstitial space. It is this extravascular blood that produces the characteristic non-blanching erythema. When the nurse presses a finger over the reddened area and the skin does not turn white (blanch), it confirms that the redness is not simply vasodilation within intact vessels, but blood that has escaped from damaged vessels into the surrounding tissue. This signifies that the injury is no longer reversible and will either resolve slowly with meticulous offloading or progress to deeper tissue loss [1]. The persistence after pressure relief further confirms the damage, distinguishing it from the transient hyperemia of a normal physiologic response.
The coccyx and sacrum are the most common sites for pressure injuries in bedridden patients due to sustained contact with support surfaces and the high interface pressures generated over a bony prominence . A study on interface pressure monitoring highlights that traditional fixed-interval turning schedules may be insufficient, as tissue tolerance varies individually, making real-time clinical assessment of early signs like non-blanching erythema critical for prevention . The identification of this finding demands immediate and strict pressure offloading to prevent progression to a Stage 2 or deeper injury, which would represent a significant failure in nursing-sensitive quality care .
Incorrect Answer Analysis
Option 1 describes blanching erythema that resolves within 30 seconds. This is the classic presentation of reactive hyperemia, a normal and expected compensatory vasodilation following temporary ischemia. The rapid resolution indicates intact microvasculature and no permanent tissue damage. While this finding signals that the area was under excessive pressure and requires continued vigilance and preventive repositioning, it does not signify an established injury and is not the most immediately concerning finding.
Option 3, dry, flaky skin with scaling on the lower extremities, describes xerosis, a common finding in older adults related to decreased sebaceous gland activity and transepidermal water loss. While dry skin can be a risk factor for skin tears and fissures that could become portals for infection, it is a chronic integumentary condition, not an acute, localized sign of deep tissue ischemia from pressure. It does not require the same level of emergent intervention as a suspected deep tissue injury.
Option 4, slight skin discoloration around a surgical incision, is an expected finding in the early post-operative period. This can represent resolving ecchymosis from the surgical trauma, a normal inflammatory healing response, or hemosiderin deposition. Without other signs of infection (increased warmth, purulent drainage, induration) or wound dehiscence, this finding is a lower priority than a new onset, non-blanching lesion over a bony prominence that signals a developing hospital-acquired pressure injury.
References (research sources)
[1]
Pressure injury: update on general concepts, clinical aspects, and laboratory findings - Part I.Research articleVelozo BC, Hong MV, Bernardo LC, E Castro MCN, Contreras-Ruiz J, Abbade LPF. (2025) · DOI: 10.1016/j.abd.2025.501187
Clinical Assessment Guide
When assessing an immobile older adult, differentiate between blanchable erythema (reactive hyperemia) and non-blanchable erythema (Stage 1 pressure injury). Use the fingertip pressure test: apply light pressure for 3 seconds; if redness persists without blanching, tissue ischemia has occurred.
Immediate Intervention Protocol
Offload completely: Position patient to fully relieve pressure from the affected bony prominence (coccyx/sacrum). Use a 30-degree lateral turn schedule every 2 hours.
Support surface: Apply a high-specification reactive foam mattress or overlay to redistribute pressure.
Skin protection: Apply a barrier film or silicone foam dressing prophylactically to the site to reduce friction and shear.
Document: Record size, location, color, and absence of blanching. Initiate a pressure injury prevention care plan.
Pathophysiology Summary
Sustained pressure exceeding capillary closing pressure (~32 mmHg) causes microcirculatory occlusion. Reperfusion injury from reactive oxygen species damages endothelial cells, leading to non-blanching erythema. This marks the transition from reversible ischemia to irreversible tissue damage.
Key Nursing Actions
Perform comprehensive skin assessment within 8 hours of admission and at least once per shift.
Inspect all bony prominences (sacrum, coccyx, heels, elbows) using adequate lighting.
Monitor for dark skin tones: look for changes in color, temperature, or tissue consistency rather than relying solely on erythema.
Non-blanching erythema — Persistent redness that does not turn white under fingertip pressure, indicating structural damage to microvasculature and Stage 1 pressure injury.
Reactive hyperemia — A temporary, compensatory vasodilation causing blanching redness after pressure relief; a normal response to brief ischemia.
Stage 1 pressure injury — Intact skin with non-blanchable erythema; the earliest visible sign of tissue damage before skin breakdown occurs.
Capillary closing pressure — The minimal pressure (approx. 32 mmHg) required to occlude capillary blood flow, leading to tissue ischemia if sustained.
Ischemia-reperfusion injury — Cellular damage paradoxically worsened when blood flow returns to ischemic tissue, generating reactive oxygen species.