Tissue Integrity

Principles of Wound Healing and Healing Intentions

• Primary Intention Healing:
  • Occurs where tissue surfaces have been cleanly approximated (closed) with minimal or no tissue loss.
  • Closed mechanically using surgical sutures, staples, or adhesive tape.
  • Characterized by minimal granulation tissue formation, leading to rapid healing and a thin, hairline scar.
  • Susceptibility to infection is low due to early epidermal seal formation.

• Secondary Intention Healing:
  • Occurs when wounds involve extensive tissue loss and the edges cannot or should not be approximated (e.g., severe pressure injuries, venous ulcers, infected wounds).
  • Healing occurs from the base upward and from the margins inward through the proliferation of extensive granulation tissue.
  • Distinguishing clinical characteristics:
    • Repair duration is substantially longer.
    • Scarring is considerably greater, thicker, and often disfiguring.
    • Susceptibility to secondary infection is significantly increased because the wound bed remains exposed to environmental pathogens.

• Tertiary Intention Healing (Delayed Primary Closure):
  • Indicated for contaminated, infected, or grossly edematous wounds.
  • The wound is intentionally left open for $3\text{ to }5\text{ days}$ to permit drainage, control active infection, or allow marked tissue edema to subside.
  • Once the wound bed demonstrates clean, healthy granulation tissue and minimal microbial burden, the wound margins are surgically sutured or closed.
  • Results in a wider, deeper scar than primary intention.

Physiological Phases of Wound Healing

• Inflammatory Phase:

  • Onset and Duration: Initiates immediately following injury and typically persists for $3\text{ to }6\text{ days}$ (or $4\text{ to }6\text{ days}$ depending on tissue condition).
  • Hemostasis Component:
    • Immediate localized vasoconstriction of larger severed blood vessels occurs to restrict blood loss.
    • Platelet aggregation triggers the clotting cascade, facilitating the deposition of fibrin and the formation of a fibrin clot.
    • The fibrin clot provides a provisional structural matrix that serves as a physical scaffolding for subsequent cell repair.
    • A surface scab develops over the wound to seal the breach from environmental contaminants.
    • Epithelial cells begin early migration from wound borders beneath the scab to establish a physical barrier against microorganisms.
  • Vascular and Cellular Response:
    • Following initial vasoconstriction, localized capillary dilation occurs, significantly increasing perfusion to the wound bed.
    • This vascular response manifests with classic cardinal signs of inflammation: marked erythema (redness), localized edema (swelling), warmth, and pain.
  • Phagocytosis Component:
    • Circulating monocytes migrate into the wound space and differentiate into tissue macrophages.
    • Macrophages perform phagocytosis, clearing cellular debris, necrotic fragments, and pathogenic microorganisms.
    • Macrophages secrete angiogenesis factor, which stimulates endothelial sprouting to create a microcirculatory vascular network.
  • Clinical Warning: Anti-inflammatory medications (especially systemic corticosteroids) suppress the inflammatory phase, resulting in compromised wound strength and markedly delayed healing.

• Proliferative Phase:

  • Onset and Duration: Extends from day $3\text{--}4$ to approximately day $21$ (spanning up to $4\text{ to }24\text{ days}$ depending on wound size).
  • Fibroblast and Collagen Synthesis:
    • Fibroblasts proliferate within the wound bed and actively synthesize collagen, progressively increasing the tensile strength of the healing tissue.
  • Granulation Tissue Development:
    • Capillary loops bud and extend across the wound base while fibroblasts deposit a fibrin framework, generating vascular, translucent pink/red granulation tissue.
    • Granulation tissue characteristically bleeds easily upon minor manipulation or dressing removal and frequently seeps blood-tinged (serosanguineous) exudate.
  • Epithelialization and Wound Contraction:
    • As granulation tissue matures, marginal epithelial cells migrate across the vascular bed, proliferating inward to resurface the deficit.
    • Myofibroblasts at the wound periphery initiate contraction, drawing the wound edges closer together.
    • If epithelial migration fails or is interrupted by excessive drying, the exposed granulation tissue dries out and forms a rigid, dark crust known as eschar.

• Maturation (Remodeling) Phase:

  • Onset and Duration: Commences around day $21$ post-injury and can persist for $1\text{ to }2\text{ years}$.
  • Collagen Reorganization:
    • Collagen fibers deposited during the proliferative phase undergo continuous remodeling, cross-linking, and realignment along lines of mechanical tension.
    • The scar gradually thins, flattens, and transitions from pink/red to a paler coloration.
    • Although scar tensile strength increases over time, the healed tissue never exceeds approximately $80\%$ of the tensile strength of original, undamaged skin.
  • Abnormal Scar Formation:
    • Excessive or dysregulated synthesis of collagen during this phase causes keloid formation, resulting in a hypertrophic scar that extends beyond the original wound margins.
    • Keloid development exhibits a strong genetic predisposition and occurs with significantly higher incidence in darkly pigmented individuals.

Factors Affecting Wound Healing and Wound Complications

• Major Wound Complications:
  • Hemorrhage: Suture failure, dislodged clots, or vessel erosion can cause massive internal or external bleeding; requires immediate intervention.
  • Infection: Localized bacterial invasion characterized by purulence, persistent erythema, edema, and fever; frequently involves multidrug-resistant organisms (MDROs) requiring targeted systemic and topical antimicrobial therapies.
  • Wound Dehiscence:
    • Partial or complete rupture and separation of previously approximated surgical incision layers.
    • Precipitated by sudden physical strain (e.g., forceful coughing, sneezing, vomiting, or improper lifting).
    • Often preceded by a sudden increase in serosanguineous drainage and an ominous patient report stating that "something has given way" or "popped."
  • Wound Evisceration:
    • The total separation of wound layers accompanied by the protrusion of internal viscera (typically loops of small bowel) through the opened surgical incision.

*   **Emergency Nursing Protocol for Evisceration:**
    *   Stay with the patient; place them immediately in a low Fowler's position with knees flexed to reduce abdominal wall tension.
    *   Cover the exposed visceral organs immediately with a large sterile dressing saturated with sterile normal saline ($\text{0.9\% NaCl}$).
    *   Do not attempt to reinsert or push the protruding organs back into the abdominal cavity.
    *   Maintain sterile saline saturation to prevent bowel drying and ischemic necrosis.
    *   Notify the surgeon immediately and prepare the patient for emergent surgical repair.

• Systemic and Local Factors Impacting Wound Healing:
  • Nutritional Support:
    • Tissue synthesis requires a high-calorie diet rich in proteins (essential for tissue repair and collagen synthesis), carbohydrates, and healthy lipids.
    • Critical micronutrients include Vitamin A (supports epithelialization and macrophage function), Vitamin C (cofactor for collagen synthesis), and essential minerals (zinc, iron, and copper).
    • Malnutrition impairs cellular proliferation and immune defense, dramatically raising infection rates.
    • Obesity increases the risk of wound infection and dehiscence because subcutaneous adipose tissue has poor vascular perfusion and resists tensile stress poorly.
  • Lifestyle and Behavioral Factors:
    • Regular physical exercise promotes cardiovascular efficiency, enhancing tissue perfusion and accelerating repair.
    • Smoking causes acute arterial vasoconstriction via nicotine and decreases functional oxyhemoglobin due to carbon monoxide inhalation, causing tissue hypoxia and delayed healing.
  • Pharmacologic Factors:
    • Anti-inflammatory agents and corticosteroids dampen the inflammatory cascade and retard cellular migration.
    • Broad-spectrum antibiotics alter systemic and localized microbiomes.
    • Chemotherapeutic agents suppress bone marrow production of leukocytes, inhibit cellular division, and compromise structural repair.

Clinical Manifestations: Types of Wound Exudate

• Exudate Definition: Fluid, extravasated cells, and metabolic breakdown products that escape from the vascular compartment into tissue beds or surface lesions in response to inflammation.

• Serous Exudate:
  • Clear, straw-colored, thin, and watery in consistency.
  • Composed predominantly of serum and protein-poor fluid; characteristic of mild or minor inflammatory processes (e.g., fluid inside a burn blister).
• Sanguineous Exudate:
  • Contains significant quantities of red blood cells, indicating disruption of capillary beds.
  • Ranges from bright red (indicating fresh, active bleeding or hemorrhage) to dark, dull red (indicating older or evacuated blood).
• Serosanguineous Exudate:
  • Thin, watery fluid exhibiting a light pink or faint red hue.
  • Represents a balanced mixture of clear serous fluid and red blood cells; normal finding in surgical drain output and early healing wounds.
• Purulent Exudate:
  • Thick, opaque, viscous, and distinctly odorous fluid representing cellular debris, liquefied dead tissue, and leukocytes.
  • Color varies depending on the specific causative pathogen (e.g., yellow, tan, brown, or green for Pseudomonas aeruginosa).
  • Direct indicator of clinical wound infection.
• Purosanguineous Exudate:
  • A mixed drainage consisting of fresh blood mixed directly with thick, purulent necrotic debris.
  • Indicates severe infection with concurrent microvascular damage or erosion.

Collaborative Management and Advanced Wound Therapies

• Diagnostic Investigations:
  • Wound culture and sensitivity (C&S) swabs collected from viable wound tissue (after wound cleansing) to identify pathogens and guide targeted antimicrobial therapy.
• Surgical Debridement and Decompression:
  • Surgical Debridement: Sharp excision of necrotic, devitalized slough or eschar using a scalpel or scissors down to the level of fascia or viable dermis to encourage granulation.
  • Escharotomy: Emergency surgical incision made through restrictive, full-thickness, leathery eschar to relieve compartment pressure, prevent ischemic neurovascular compromise, and accommodate severe post-injury edema.

• Pharmacologic Interventions:
  • Systemic antibiotics selected according to culture sensitivities.
  • Topical antimicrobials (e.g., silver-impregnated dressings, cadexomer iodine, medical-grade honey).
  • Multimodal analgesics administered prophylactically prior to painful wound dressing changes.
• Negative Pressure Wound Therapy (NPWT / Wound VAC):
  • Consists of an open-cell reticulated polyurethane foam sponge fitted into the wound deficit, covered with an airtight semi-occlusive adhesive film seal, and connected via evacuation tubing to a programmable vacuum pump.

*   **Therapeutic Mechanisms:**
    *   Removes excess interstitial fluid and localized edema, decompressing local microvasculature.
    *   Increases localized perfusion to the wound bed.
    *   Exerts mechanical micro-strain on cell membranes, stimulating mitosis and accelerating granulation tissue formation.
    *   Facilitates wound contracture and draws wound margins together.
    *   Prepares complex, deep wounds (such as exposed bone or tendons) for secondary healing or split-thickness skin grafts.

Lifespan Considerations in Tissue Integrity

• Premature Neonates:
  • Extreme risk for invasive bacterial and fungal cutaneous infections due to an underdeveloped stratum corneum, high skin permeability, and low baseline immune function.
  • High surface-area-to-body-mass ratio accelerates percutaneous absorption of topical products and trans-epidermal water loss.
• Children and Pediatric Patients:
  • Vulnerable to common communicable fungal tinea infections and epidermal bacterial lesions, particularly Staphylococcus aureus.
• Older Adults:
  • Experience intrinsic thinning of the epidermal and dermal layers, loss of subcutaneous adipose cushion, reduced sebaceous gland activity, and flattened dermal-epidermal rete ridges.
  • Skin is excessively fragile and prone to shear tears and tape burns.
  • Mandates the use of paper tape, silicone adhesives, and specialized adhesive tape removers during all dressing changes.
  • Age-associated immobility, malnutrition, systemic vascular disease, and urinary or fecal incontinence exponentially increase the risk of skin breakdown.

Comprehensive Wound Assessment: The TIME Framework

• T — Tissue Bed Assessment:
  • Epithelial Tissue: Pink or pearly white, fragile new skin migrating inward; viable, must be protected.
  • Granulation Tissue: Bright red, moist, cobblestone-like vascular bed; viable, must be kept moist and protected.
  • Hypergranulation Tissue: Raised, uneven, friable red tissue extending above surrounding wound margins; impedes normal epithelial migration.
  • Slough: Soft, stringy, moist devitalized tissue; colors range from yellow to brown or grey; non-viable, requires debridement.
  • Necrotic Tissue (Eschar): Hard, leathery, dry, black or dark brown dead tissue; non-viable, inhibits healing and requires sharp debridement (except stable dry heel eschar).

• I — Infection and Inflammation:

  • Evaluates the microbial spectrum: Contamination $\rightarrow$ Colonization $\rightarrow$ Local Infection $\rightarrow$ Systemic Infection.
  • Biofilms: Microscopic, complex, slime-encased polymicrobial communities that firmly adhere to the wound bed; highly refractory to standard topical antiseptics and systemic antibiotics, generating chronic non-healing states and persistent inflammation.
  • Cardinal Indicator: Spreading periwound erythema is a definitive clinical hallmark of active wound infection.

• M — Moisture Balance:

  • Excessive Moisture: Wound beds that are too wet cause periwound maceration (softened, pale, wrinkled skin) and excoriation; requires absorbent dressings (e.g., foams, calcium alginates).
  • Deficient Moisture: Wounds that are too dry desiccate and form thick eschar, blocking cellular migration; requires moisture-donating dressings (e.g., amorphous hydrogels, hydrogel sheets).

• E — Edge Progression:

  • Advancing Edges: Margins are flat, smooth, pink, and actively migrating inward toward the center.
  • Non-Advancing Edges: Edges are thick, rolled (epibole), hyperkeratotic, raised, or dusky; signals that systemic or local wound barriers must be reassessed.

• Wound Measurement and Spatial Mapping:

  • Linear measurement recorded in centimeters ($\text{cm}$) utilizing a calibrated paper ruler:
    • Length: Greatest dimension head-to-toe ($12:00\text{ to }6:00$ orientation).
    • Width: Greatest dimension side-to-side ($9:00\text{ to }3:00$ orientation).
    • Depth: Insert a sterile, cotton-tipped applicator into the deepest point of the wound bed; measure against the ruler.

*   **Tunneling:** A narrow channel extending from the wound bed in any direction into the deeper subcutaneous tissue or muscle layers; measured with a sterile probe and documented using clock-face orientation.

*   **Undermining:** Destruction of subcutaneous tissue creating a shelf, lip, or hollow space beneath intact skin edges along the wound perimeter; documented by extent and clock-face positions (e.g., undermining from $1:00\text{ to }5:00$).

Pathophysiology and Etiology of Pressure Injuries

• Core Pathophysiology:
  • Previously termed bedsores or decubitus ulcers.
  • Ischemic lesions affecting skin and underlying soft tissues resulting from sustained external pressure over bony prominences.
  • Prolonged localized pressure exceeds baseline capillary closing pressure ($\approx 32\,mmHg$), collapsing regional capillaries and lymphatic microvessels.
  • This occlusion provokes microvascular thrombosis, tissue ischemia, and severe hypoxia.
  • Deprived of oxygen and glucose, cellular metabolism fails, leading to extensive tissue necrosis and open ulceration.
  • Secondary bacterial infection is a frequent complication in the devitalized tissue bed.
• Shearing Force:
  • Mechanical stress generated when adjacent tissue layers slide across one another in opposite directions.
  • Occurs when a patient sits up in bed ($> 30^\circ$ elevation) and gravity pulls the deep skeleton downward toward the foot of the bed while the cutaneous surface remains stationary against sheets due to friction.
  • Stretches, kinks, and tears the perforating subcutaneous arterioles and venules, inducing deep ischemic necrosis at the muscle-fascial interface.

• High-Risk Anatomical Pressure Points:
  • Supine Position: Occiput (back of head), scapulae, spine, elbows, sacrum, and heels.
  • Side-Lying (Lateral) Position: Ear, acromion process, ribs, greater trochanter of the femur, medial and lateral femoral condyles (knees), malleoli of the ankles, and lateral margins of the toes.
  • Prone Position: Cheek, ear, acromion process, breasts (female), genitalia (male), anterior superior iliac spines, patellae (knees), and toes.

*   *Sitting Position (Chair/Wheelchair):* Scapulae, spinous processes, ischial tuberosities (buttocks), popliteal spaces, heels, and balls of the feet.

• Medical Device-Related Pressure Injuries (MDRPI):
  • Pressure injuries resulting from diagnostic or therapeutic devices pressing against the skin or mucous membranes.
  • Typically mirror the shape, contour, or outline of the offending device.
  • Common culprits include nasal cannula prongs (nares and ears), endotracheal tube holders (lips and tongue), indwelling Foley catheter tubing (inner thighs or meatus), cervical collars, and tight tracheostomy ties.

Staging System for Pressure Injuries

• Stage 1 Pressure Injury:
  • Intact skin presenting with a localized area of non-blanchable erythema (redness that does not turn white when finger pressure is applied).
  • Typically positioned directly over a bony prominence.
  • Area may be painful, firm, soft, warmer, or cooler compared to adjacent tissue.
  • Functions as a critical clinical indicator ("heralding sign") of tissue at severe risk of deterioration.

• Deep Tissue Pressure Injury (DTPI):
  • Intact or non-intact skin exhibiting localized, persistent, non-blanchable deep red, maroon, or purple discoloration.
  • May present alternatively as epidermal separation revealing a dark wound bed or a blood-filled blister.
  • Originates from intense, sustained pressure and shear stresses at the bone-muscle interface, with damage migrating outward toward the skin surface.
  • Often preceded by tissue that is painful, firm, mushy, boggy, or warmer/cooler than surrounding tissues.

• Stage 2 Pressure Injury:
  • Partial-thickness skin loss involving exposure of the viable dermis.
  • Presents clinically as a shallow, open ulcer with a viable pink or red, moist wound bed.
  • Granulation tissue, slough, and eschar are completely absent.
  • May also manifest as an intact or ruptured serum-filled blister.
  • Does not include skin tears, tape burns, perineal dermatitis, maceration, or excoriation.

• Stage 3 Pressure Injury:
  • Full-thickness skin loss involving destruction or necrosis of subcutaneous adipose tissue.
  • Subcutaneous fat is visible within the wound crater; bone, tendon, ligament, and muscle are not exposed or palpable.
  • Granulation tissue and rolled wound edges (epibole) are frequently observed.
  • Slough and/or eschar may be present on the wound bed, but do not obscure the true depth of tissue destruction.
  • May present with undermining and tunneling.

• Stage 4 Pressure Injury:
  • Full-thickness skin and tissue loss with extensive destruction, tissue necrosis, and directly exposed or palpable bone, muscle, tendon, ligament, or cartilage.
  • Slough and/or eschar are commonly visible on the ulcer base.
  • Epibole (rolled edges), undermining, and extensive sinus tract tunneling frequently accompany these lesions.
  • High risk for osteomyelitis.

• Unstageable Pressure Injury:
  • Full-thickness skin and tissue loss in which the actual extent of underlying tissue damage cannot be confirmed because it is obscured by non-viable slough (yellow, tan, gray, or brown) or eschar (tan, brown, or black).
  • Definitive staging (identifying whether the lesion is Stage 3 or Stage 4) can only occur after sufficient slough and eschar have been debrided.
  • Clinical Exception: Stable, dry, intact, non-tender eschar on the heels without erythema or fluctuance serves as the body's natural physiological cover and must not be debrided.

Clinical Evaluation of Pressure Injuries in Darkly Pigmented Skin

• Diagnostic Disparities and Challenges:
  • Conventional education emphasizes visual erythema (blanching redness) as the primary indicator of early pressure damage.
  • In darkly pigmented skin tones, cutaneous melanin masks erythema, preventing typical visual detection.
  • Consequently, Stage 1 pressure injuries are under-reported in dark-skinned individuals, leading to unmitigated progression directly into full-thickness Stage 3, Stage 4, or unstageable wounds.

• Critical Physical Assessment Indicators for Dark Skin Tones:
  • Color Variations: Look for areas that are purplish, bluish, violaceous, or darker (hyperpigmented or ashen) than the patient's surrounding skin baseline.
  • Ischemic Hue: A persistent purple hue indicates established local microvascular ischemia.
  • Localized Edema: Taut, shiny, swollen skin resulting from acute inflammatory exudate accumulation over a bony prominence.
  • Temperature Differential: Palpate with the back of the hand; injured areas exhibit early localized warmth due to inflammation, followed by coolness as hypoperfusion and cellular necrosis develop.
  • Tissue Consistency Changes: Palpate for induration (abnormal hardness/firmness) compared to adjacent soft tissue, or areas that feel soft, boggy, spongy, or fluctuant (indicating liquefactive deep necrosis).
  • Sensory Alterations: Assess for patient-reported localized discomfort, tenderness, severe pain, burning, or numbness.

Pressure Injury Risk Assessment: The Braden Scale

• Overview and Significance:

  • Evidence-based screening instrument designed to predict pressure injury risk across six clinical subscales.
  • Total score range is $6\text{ to }23$.
  • Lower scores indicate lower functional capability and higher risk for developing pressure injuries (hospitalized adults with a score of $\le 18$ are considered at significant clinical risk and require preventive protocols).

• Subscale 1: Sensory Perception (Ability to respond meaningfully to pressure-related discomfort):

  • Score 1 (Completely Limited): Unresponsive to painful stimuli (does not moan, flinch, or grasp) due to diminished consciousness or sedation, OR limited ability to feel pain over most of body surface.
  • Score 2 (Very Limited): Responds only to painful stimuli; cannot communicate discomfort except by moaning or restlessness, OR has a sensory impairment that limits the ability to feel pain or discomfort over $\frac{1}{2}$ of body.
  • Score 3 (Slightly Limited): Responds to verbal commands, but cannot always communicate discomfort or need to be turned, OR has some sensory impairment that limits ability to feel pain or discomfort in $1\text{ or }2$ extremities.
  • Score 4 (No Impairment): Responds to verbal commands; has no sensory deficits that would limit ability to feel or voice pain or discomfort.

• Subscale 2: Moisture (Degree to which skin is exposed to moisture):

  • Score 1 (Constantly Moist): Skin is kept moist almost constantly by perspiration, urine, or liquid stool; dampness is detected every time patient is moved or turned.
  • Score 2 (Very Moist): Skin is often, but not always, moist; linen must be changed at least once per shift.
  • Score 3 (Occasionally Moist): Skin is occasionally moist, requiring an extra linen change approximately once per day.
  • Score 4 (Rarely Moist): Skin is usually dry; linen requires changing only at routine intervals.

• Subscale 3: Activity (Degree of physical activity):

  • Score 1 (Bedfast): Confined to bed.
  • Score 2 (Chairfast): Ability to walk is severely limited or non-existent; cannot bear own weight; must be assisted into chair or wheelchair.
  • Score 3 (Walks Occasionally): Walks occasionally during day, but for very short distances, with or without assistance; spends majority of each shift in bed or chair.
  • Score 4 (Walks Frequently): Walks outside the room at least twice a day and inside the room at least once every $2\text{ hours}$ during waking hours.

• Subscale 4: Mobility (Ability to change and control body position):

  • Score 1 (Completely Immobile): Does not make even slight changes in body or extremity position without assistance.
  • Score 2 (Very Limited): Makes occasional slight changes in body or extremity position but is unable to make frequent or significant changes independently.
  • Score 3 (Slightly Limited): Makes frequent though slight changes in body or extremity position independently.
  • Score 4 (No Limitation): Makes major and frequent changes in position without assistance.

• Subscale 5: Nutrition (Usual food intake pattern):

  • Score 1 (Very Poor): Never eats a complete meal; rarely eats more than $\frac{1}{3}$ of any food offered; eats $2$ servings or less of protein per day; takes fluids poorly; does not take a liquid dietary supplement, OR is NPO and/or maintained on clear liquids or IV fluids for more than $5\text{ days}$.
  • Score 2 (Probably Inadequate): Rarely eats a complete meal and generally eats only about $\frac{1}{2}$ of any food offered; protein intake includes only $3$ servings of meat or dairy products per day; occasionally will take a dietary supplement, OR receives less than optimum amount of liquid diet or tube feeding.
  • Score 3 (Adequate): Eats over half of most meals; eats a total of $4$ servings of protein daily; occasionally will refuse a meal, but will take a dietary supplement when offered, OR is on a tube feeding or total parenteral nutrition (TPN) regimen that meets most nutritional needs.
  • Score 4 (Excellent): Eats most of every meal; never refuses a meal; usually eats a total of $4$ or more servings of meat and dairy products; occasionally eats between meals; does not require supplementation.

• Subscale 6: Friction & Shear:

  • Score 1 (Problem): Requires moderate to maximum assistance in moving; complete lifting without sliding against sheets is impossible; frequently slides down in bed or chair, requiring frequent repositioning with maximum assistance; spasticity, contractures, or agitation leads to almost constant friction.
  • Score 2 (Potential Problem): Moves feebly or requires minimum assistance; during a move skin probably slides to some extent against sheets, chair, restraints, or other devices; maintains relatively good position in chair or bed most of the time but occasionally slides down.
  • Score 3 (No Apparent Problem): Moves in bed and in chair independently and has sufficient muscle strength to lift up completely during move; maintains good position in bed or chair at all times.

Nursing Interventions, Offloading, and Prevention Strategies

• Repositioning and Offloading Protocols:
  • Core Rule: "If it moves, ambulate it; if it doesn't move, turn and reposition it Q2H ($\text{every } 2\text{ hours}$)."
  • Chair-bound individuals must be repositioned at least every $1\text{ hour}$; instruct independent chair patients to shift their weight every $15\text{ minutes}$.
  • Maintain a $30^\circ$ lateral tilted position when side-lying to avoid direct compression over the greater trochanter of the femur.
  • Keep the head of the bed (HOB) at or below $30^\circ$ (unless contraindicated by respiratory distress or aspiration risk) to prevent pelvic slide and reduce shear stress.
  • Completely float heels off the mattress using specialized heel offloading suspension boots or pillows placed longitudinally beneath calves.

*   *Strict Prohibition:* Never vigorously massage reddened bony prominences; massage over ischemic tissues fractures delicate capillary networks and deepens necrosis.

• Safe Handling and Mechanical Transfer:
  • Use friction-reducing draw sheets, slide boards, and mechanical ceiling or floor lifts to lift rather than drag patients across bed linens.
  • Ensure all underlying linens remain dry, taut, and wrinkle-free.

• Skin Care, Hygiene, and Moisture Management:
  • Conduct comprehensive, head-to-toe skin assessments at least every $12\text{ hours}$ or once per nursing shift.
  • Cleanse skin immediately upon soiling using lukewarm water and gentle, pH-balanced cleansing agents; avoid harsh soaps and hot water that strip cutaneous lipids.
  • Apply zinc oxide-based barrier creams or dimethicone barrier ointments to create a waterproof shield between perineal skin and urine or feces.
  • Avoid thick petroleum-based ointments that trap moisture directly against the epidermal surface.
  • Implement scheduled toileting programs; consider non-invasive external collection devices (e.g., female external catheters such as PureWick) to minimize contact with moisture.
  • Apply prophylactic multi-layered silicone bordered foam dressings over high-risk sacral and coccygeal areas to dissipate shear forces.

• Advanced Support Surfaces:
  • Utilize pressure-redistributing dynamic foam mattresses, alternating-pressure mattresses, low-air-loss surfaces, or air-fluidized beds (e.g., Clinitron beds containing ceramic microspheres fluidized by warm pressurized air) for complex wounds or extensive full-thickness injury.

• Systemic Care and Evaluation:
  • Administer high-protein dietary supplements and maintain optimal hydration.
  • Protect patient dignity, body image, and self-esteem during intensive wound care and hygiene procedures.
  • Evaluate, document, and adapt the individualized wound and pressure care plan as often as daily based on healing trajectory.