CCRN · Endocrine, Hematology/Immunology, GI, Renal/GU, Integumentary · 6 min read
Pressure Injury, Skin Failure and Wound Care
- Differentiate pressure injury stages, deep tissue injuries, and manifestations of systemic skin breakdown to guide proactive critical care nursing interventions.
- Distinguish uncomplicated cellulitis from limb- and life-threatening necrotizing soft tissue infections to initiate rapid surgical escalation.
- Implement evidence-based protocols for vascular extravasation, acute surgical wound disruptions, negative pressure wound therapy, and fecal containment devices.
Pressure Injury Staging, Pathomechanics, and Acute Skin Breakdown
Critically ill patients face heightened vulnerability to integumentary compromise due to immobility, altered hemodynamics, and device requirements. Pressure injuries develop over bony prominences or under diagnostic and therapeutic equipment. Medical device-related pressure injuries typically mirror the exact shape and distribution of the offending device. Mucosal membrane pressure injuries develop on vulnerable tissues lined by mucous membranes secondary to medical devices; because of the unique histology of these surfaces, they cannot be categorized using the standard numeric staging system.
Deep mechanical trauma often stems from shear stress, which occurs when adjacent tissue layers slide across each other. This movement stretches and angulates the microvascular supply, resulting in deep tissue ischemia. For instance, when a mechanically ventilated patient slides downward while the head of the bed is raised, intense shear forces are transmitted directly to the sacrococcygeal tissues. Under the AACN Synergy Model, clinical judgment requires synthesizing hemodynamic status with tissue perfusion to tailor repositioning regimens that prevent skin injury without compromising cardiorespiratory stability, balancing skin protection against ordered head-of-bed elevations needed for respiratory optimization and aspiration-risk management.
Not all skin compromise represents routine pressure injury. Acute skin failure is a proposed description of skin breakdown associated with severe systemic illness and impaired perfusion; it lacks a universally accepted diagnostic definition and does not replace assessment for pressure injury and other causes. Similarly, the term Kennedy terminal ulcer describes a rapidly developing skin breakdown, often over the sacrococcygeal area in patients near the end of life. However, its appearance does not reliably establish cause or predict the timing of death, reinforcing the necessity of comprehensive bedside assessment.
| Classification | Anatomical Depth | Bedside Presentation |
|---|---|---|
| Stage 1 | Epidermis intact | Stage 1 pressure injury presents as intact skin with localized non-blanchable erythema; in darkly pigmented skin, the affected area may appear different from surrounding tissue without obvious redness. |
| Stage 2 | Partial-thickness loss of skin with exposed dermis | Shallow open ulcer with a red or pink wound bed, or an intact or ruptured serum-filled blister. |
| Stage 3 | Full-thickness skin loss | Adipose tissue may be visible; fascia, muscle, tendon, ligament, cartilage, and bone are not exposed. |
| Stage 4 | Full-thickness skin and tissue loss | Directly palpable or exposed fascia, muscle, tendon, ligament, cartilage, or bone. |
| Unstageable | Full-thickness skin and tissue loss | Extent of tissue damage cannot be determined because slough or eschar obscures the wound bed. |
| Deep Tissue Pressure Injury | Deep tissue / microvascular injury | Persistent, non-blanchable deep red, maroon, or purple discoloration, or epidermal separation revealing a dark wound bed or blood blister. |
Common mistakes
- Flushing an intravenous cannula after suspected infiltration or extravasation can deliver more infusate into surrounding tissue and worsen the injury.
- Attempting to manually reduce protruding abdominal contents back into the peritoneal cavity during an acute wound evisceration rather than covering them with sterile normal-saline-moistened gauze.
- Inflating the retention balloon of an indwelling fecal management system with air or overfilling it with fluid, which creates focal pressure necrosis of the rectal mucosa and risks bowel perforation.
- Aggressively softening or debriding stable, dry, adherent, intact eschar on a patient's heel or ischemic limb instead of leaving it intact as a protective physiological barrier.
Key points
- Numeric pressure injury stages describe the extent of skin and tissue damage; deep tissue and unstageable injuries have separate classifications, and mucosal membrane pressure injuries cannot be numerically staged. Stable, dry, adherent, intact eschar on a heel or ischemic limb should not be softened or debrided.
- Under the AACN Synergy Model, nurses align hemodynamic stability with tissue perfusion to tailor repositioning and mitigate sacrococcygeal shear caused by elevated head-of-bed positioning.
- Cellulitis commonly has indistinct erythematous borders that can be marked for serial assessment; necrotizing fasciitis may cause disproportionate pain early, while anesthesia, crepitus, and shock are possible later findings whose absence must not delay urgent surgical escalation.
- Low LRINEC scores cannot rule out necrotizing soft tissue infection; clinical assessment and surgical consultation take priority over laboratory indices.
- Extravasations require immediate infusion cessation without flushing, protocol-guided aspiration, extremity elevation, and ordered antidotes such as phentolamine for alpha-adrenergic vasopressors or hyaluronidase for specific solutions.
- Evisceration mandates immediate assistance, low Fowler positioning with knees slightly flexed, and application of sterile saline-moistened gauze without attempting organ reduction.
- Negative pressure wound therapy is contraindicated over exposed major vessels, bypass grafts, or viable organs, and indwelling fecal management systems require fluid-only balloon inflation while monitoring for bright red rectal bleeding.
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