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Eduovisual

Skin & Subcutaneous Tissue

Pressure injuries: staging, prevention, and management

Clinical Overview and When to Suspect Pressure Injuries

— Prevalence 5–15% in acute care; up to 25% in long-term care and 30% in spinal cord injury units.

— Stage 3, 4, unstageable, and deep tissue pressure injuries (DTPI) acquired in-hospital are CMS "never events" — non-reimbursable hospital-acquired conditions (HACs).

— Estimated cost $20,000–$150,000 per advanced injury; contributes to >60,000 US deaths annually.

— Sustained capillary closure pressure (>32 mmHg) → ischemia, reperfusion injury, lymphatic obstruction, and cytokine-mediated necrosis.

Shear (parallel forces, e.g., head of bed >30°) and friction amplify injury at lower pressures.

— Moisture (incontinence, sweat, wound drainage) macerates skin and lowers threshold for breakdown.

— Any patient immobile >2 hours (OR table, ED boarding, ICU, post-op).

— Sensory deficit: SCI, stroke, dementia, sedation, neuropathy.

— Malnutrition (albumin <3.5, unintentional weight loss, BMI <18.5), dehydration.

— Incontinence, devices (NG tubes, ETT, O₂ tubing behind ears, casts, cervical collars, SCDs).

— Vasopressor use, hypotension, anemia, end-of-life states (Kennedy terminal ulcer).

Board pearl: A pressure injury developing within hours in a hemodynamically unstable or dying patient with a butterfly/pear-shaped sacral lesion is a Kennedy terminal ulcer — a sign of impending death, not a quality failure. Document accordingly to avoid misclassification as a preventable HAC.

Definition: Localized damage to skin and/or underlying soft tissue, usually over a bony prominence or related to a medical/other device, resulting from intense and/or prolonged pressure or pressure in combination with shear.
Epidemiology and systems impact:
Pathophysiology (why pressure injures tissue):
When to suspect on admission or rounds:
High-risk anatomic sites: sacrum/coccyx (most common), heels (#2), ischial tuberosities (wheelchair), greater trochanter (side-lying), occiput (pediatrics, supine adults), ears (NC O₂).
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Presentation Patterns and Key History

— Stage 1 can appear within 30–60 minutes of unrelieved pressure; DTPI may take 24–72 hours to declare its full depth ("evolving injury").

— Patients with intact sensation report localized pain, burning, or tenderness before visible skin change — pain often precedes erythema and is an early warning sign.

— Duration of immobility (surgery length, ED boarding hours, time since last turn documented in nursing flowsheet).

— Prior pressure injuries (strongest predictor of new injury); spinal cord level if SCI.

— Continence pattern, frequency of brief changes, use of barrier creams.

— Nutritional intake: protein servings/day, recent weight loss, dysphagia, NPO duration.

— Devices in continuous contact: BiPAP mask, nasal cannula, Foley, telemetry leads, casts.

— Caregiver capacity at home, type of mattress/cushion, repositioning schedule.

Braden Scale (6 subscales: sensory perception, moisture, activity, mobility, nutrition, friction/shear). Score ≤18 = at risk; ≤12 = high risk. Mandated on admission and at least daily in acute care, every shift in ICU.

Norton Scale — older, used in LTC.

PUSH tool tracks healing, not risk.

— Prolonged OR time (>3 hours), hypotension intraop, hypothermia.

— "Bruise that won't fade" over a bony prominence = suspect DTPI until proven otherwise.

— Foul odor, fever, new delirium, or unexplained leukocytosis in a known ulcer = suspect osteomyelitis or sepsis.

Step 3 management: On admission, document a Braden score within 8 hours and a head-to-toe skin assessment within 24 hours — failure to do so is the most commonly tested patient safety lapse and a Joint Commission deficiency. Reassess after every transfer of care (OR → ICU, ICU → floor) because shear during transfers is when undetected injuries are missed.

Symptom timeline:
Key history elements to elicit:
Risk assessment tools (must know for Step 3):
Red-flag history suggesting deeper injury than visible:
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Physical Exam Findings and Staging (NPIAP 2016)

Key distinction: Pressure injuries are staged by deepest visible tissue; once staged, they do not "downstage" as they heal — a healing Stage 4 is documented as "healing Stage 4," not Stage 2. Reverse staging is incorrect and a common documentation error penalized in audits.

Stage 1: Intact skin with non-blanchable erythema over a localized area, usually a bony prominence. In darkly pigmented skin, look for persistent color change, warmth, induration, or boggy texture rather than redness — use side-by-side comparison with surrounding skin.
Stage 2: Partial-thickness skin loss with exposed dermis; wound bed is pink/red, moist, may present as an intact or ruptured serum-filled blister. No slough, no granulation, no eschar. Do NOT use Stage 2 for skin tears, moisture-associated skin damage (MASD), or tape injuries.
Stage 3: Full-thickness skin loss; subcutaneous fat visible, but bone/tendon/muscle NOT exposed. Slough and/or eschar may be present but do not obscure depth. Undermining and tunneling may occur. Depth varies by anatomy — shallow on ear/occiput (no fat), deep on buttock.
Stage 4: Full-thickness skin and tissue loss with exposed or directly palpable fascia, muscle, tendon, ligament, cartilage, or bone. Often with undermining, tunneling, slough, eschar. Osteomyelitis risk is high.
Unstageable: Full-thickness loss in which the base is obscured by slough or eschar. Cannot stage until debrided. Exception: stable (dry, adherent, intact, non-fluctuant) eschar on the heel or ischemic limb should NOT be removed — it serves as a biologic cover.
Deep Tissue Pressure Injury (DTPI): Intact or non-intact skin with localized persistent non-blanchable deep red, maroon, or purple discoloration or epidermal separation revealing a dark wound bed or blood-filled blister. Results from intense pressure/shear at the bone-muscle interface.
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Diagnostic Workup — Bedside Assessment and Initial Labs

— Location, stage, length × width × depth (cm) using sterile cotton-tip applicator.

— Wound bed: % granulation, % slough, % eschar, % epithelialization.

— Exudate: amount (none/scant/moderate/heavy), type (serous/sanguineous/purulent).

— Edges: attached, rolled (epibole), undermined, tunneled — probe with sterile applicator and document clock-face position and depth.

— Periwound skin: maceration, erythema, induration, warmth.

— Odor (after cleansing — pre-cleansing odor is not reliable).

— Pain score.

— CBC with differential, CRP, ESR, blood cultures × 2 if febrile or septic.

— Albumin and prealbumin (half-life 2 days, better acute marker); total protein.

— HbA1c, glucose — uncontrolled DM impairs healing (target A1c <8% for wound healing; tight control if surgical candidate).

— BMP for renal function (affects antibiotic dosing and protein needs).

— Vitamin levels only if clinically deficient: vitamin C, zinc, vitamin D (routine supplementation NOT recommended without deficiency — overuse of zinc impairs copper absorption and healing).

Do NOT swab the wound surface for culture; it grows colonizers and misleads therapy.

— Obtain culture by tissue biopsy or curettage from the wound base after debridement and cleansing, or by Levine technique if biopsy not feasible.

— Quantitative culture >10⁵ CFU/g supports infection.

Board pearl: A "positive wound swab" in an afebrile patient with a clean-appearing ulcer is colonization, not infection — treating it with antibiotics is a classic Step 3 wrong-answer trap and contributes to antimicrobial stewardship failures and C. difficile risk.

Wound assessment at every dressing change (document):
Photography: Standardized, with ruler and date, per institutional policy and patient consent — improves handoff accuracy.
Laboratory workup (when infection or systemic compromise suspected):
Cultures — the most-tested pitfall:
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Diagnostic Workup — Advanced Studies and Osteomyelitis Evaluation

— Stage 3 or 4 ulcer over a bony prominence with exposed bone, non-healing >4–6 weeks despite optimal care, systemic signs of infection, or planned flap reconstruction.

— Sensitivity 90%, specificity 80%+ for osteomyelitis.

— Distinguishes soft-tissue abscess, sinus tracts, marrow edema.

— Limitations: cannot always differentiate reactive marrow changes from true infection adjacent to chronic ulcer; SCI patients may have baseline marrow changes.

— Indicated before prolonged antibiotic course for chronic osteomyelitis.

— Obtain through uninvolved skin when possible to avoid contamination; hold antibiotics ≥2 weeks prior if patient is clinically stable.

— CT for surgical planning and to detect gas, abscess, or foreign body.

— Tagged WBC scan/PET useful when MRI contraindicated (hardware, pacemaker).

— Doppler/ABI for sacral or heel ulcers with concern for arterial compromise — ABI <0.5 = critical limb ischemia, refer vascular before debridement of heel.

Step 3 management: "Probe-to-bone" at bedside with a sterile blunt probe in a Stage 4 ulcer has PPV ~89% for osteomyelitis in diabetic/pressure ulcers — a positive probe-to-bone in a chronic ulcer is sufficient to obtain MRI and consult ortho/plastics, even before labs return.

When to image:
Plain radiographs (first-line): Cheap, fast; sensitivity ~60%, specificity ~70% for osteomyelitis. Findings (periosteal reaction, cortical erosion, lytic changes) lag 2–3 weeks behind disease. A negative film does NOT rule out osteomyelitis.
MRI (gold standard imaging):
Bone biopsy with histopathology + culture (definitive):
Other modalities:
Nutrition assessment: Registered dietitian consult for all Stage 3/4 or non-healing wounds; calculate protein need 1.25–1.5 g/kg/day (up to 2 g/kg/day for severe wounds if renal function permits), calories 30–35 kcal/kg/day.
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Risk Stratification and Prevention Bundle — First-Line Logic

Repositioning every 2 hours in bed, every 1 hour in chair; 30° lateral tilt (NOT 90° side-lying, which loads the trochanter); avoid head of bed >30° unless medically required (reduces sacral shear).

Pressure-redistributing surface: high-specification foam mattress for all at-risk patients; alternating-pressure or low-air-loss mattress for Braden ≤12, existing Stage 3/4, or post-flap.

Heel offloading — float heels with pillow under calves, or heel suspension boots. Heel ulcers are second most common and the most preventable.

Skin care: pH-balanced cleansers, barrier creams (zinc oxide, dimethicone) for incontinence, prompt brief changes, avoid massage of bony prominences (causes deep tissue damage).

Nutrition optimization: screen with MUST or MNA; oral nutritional supplements with arginine, zinc, antioxidants for high-risk patients (level 1 evidence reduces incidence).

Moisture management: treat incontinence-associated dermatitis (IAD) separately — barrier products, fecal management systems for liquid stool.

Mobilization: out of bed as early as safe; PT/OT consult.

— Rotate pulse-ox sites q4h, pad under O₂ tubing behind ears, reposition ETT/NG q shift, ensure cervical collars and casts are properly fitted, check under SCDs daily.

— Account for ~30% of all hospital-acquired pressure injuries.

CCS pearl: On any CCS case with an immobile patient, order "skin assessment," "Braden score," "turn q2h," "pressure-redistribution mattress," and "nutrition consult" in the initial order set — these are scored as appropriate preventive care and missing them costs points on long-stay or ICU cases.

Universal prevention bundle (apply to every at-risk patient — Braden ≤18):
Device-related pressure injury prevention:
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Pharmacotherapy and Topical Wound Care — First-Line Regimens

Dry wound → hydrogel (donates moisture) + secondary cover.

Minimal exudate, granulating → hydrocolloid or thin foam; protects and maintains moist environment.

Moderate–heavy exudate → foam, alginate, or hydrofiber; change when strikethrough occurs (typically q1–3 days).

Infected/heavy bioburden → silver-impregnated dressing or cadexomer iodine for 2 weeks, then reassess; do not use silver indefinitely.

Tunneling/undermining → loosely pack with alginate ribbon or hydrofiber; never overpack (causes pressure necrosis).

Stable dry eschar on heel → leave intact, paint with povidone-iodine, offload — do NOT debride.

Topical antibiotics (mupirocin, neomycin, bacitracin) are NOT recommended for pressure ulcers — sensitization and resistance.

— Cellulitis/soft tissue infection: cover MRSA + streptococci (e.g., vancomycin or linezolid) ± gram-negative/anaerobe coverage for sacral/perineal ulcers (piperacillin-tazobactam).

— Osteomyelitis: culture-directed, 6 weeks IV typically, after surgical debridement.

Board pearl: Routine systemic antibiotics for a non-infected pressure ulcer delay healing by selecting resistant flora and do not improve outcomes — antibiotics are for clinical infection (advancing erythema, warmth, purulence, fever, leukocytosis, bacteremia), not for colonized wounds.

Wound bed preparation — TIME framework: Tissue (debride non-viable), Infection/inflammation (control bioburden), Moisture (balance), Edges (advance epithelium).
Cleansing: Normal saline or potable tap water at each dressing change. Avoid cytotoxic agents (povidone-iodine, hydrogen peroxide, Dakin's, acetic acid) on healing tissue — reserve dilute Dakin's only for heavily contaminated or necrotic wounds short-term.
Dressing selection by wound characteristics:
Negative pressure wound therapy (NPWT/wound VAC): Stage 3/4 with adequate perfusion, after debridement, no untreated osteomyelitis, no exposed vessels/anastomoses, no malignancy in wound. Promotes granulation, reduces edema, increases perfusion.
Antibiotics — systemic, not topical, for infection:
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Procedures — Debridement, Reconstruction, and Adjuncts

Sharp/surgical (fastest): Scalpel/curette at bedside or OR; required for extensive necrosis, advancing infection, sepsis source control. CCS action: call surgery STAT for sepsis from a Stage 4 sacral ulcer.

Enzymatic: Collagenase ointment daily — selective, useful when sharp debridement contraindicated (anticoagulation, palliative).

Autolytic: Hydrogels/hydrocolloids — slowest, for stable wounds with minimal necrosis.

Mechanical: Wet-to-dry dressings are outdated and discouraged — non-selective, painful, damage granulation. A common Step 3 wrong answer.

Biologic (maggot/larval): Niche use for resistant biofilm.

— Indications: Stage 3/4 ulcers that fail 4–6 weeks of optimal conservative therapy, in patients with stable medical status and ability to offload postop.

— Procedures: myocutaneous flaps (gluteus maximus for sacral, tensor fascia lata for trochanteric, hamstring for ischial).

— Pre-op: nutrition optimization (albumin >3, prealbumin >15), smoking cessation, glycemic control, treat osteomyelitis, urinary/fecal diversion if needed.

— Post-op: air-fluidized bed × 4–6 weeks, no sitting/pressure on flap × 6 weeks, gradual sitting protocol.

— Hyperbaric O₂: not standard for pressure ulcers (unlike diabetic foot); limited evidence.

— Electrical stimulation: weak recommendation for recalcitrant Stage 2–4.

— Skin substitutes/grafts: select cases.

Step 3 management: Before any flap procedure, ensure the patient has reliable offloading at home or placement plan — recurrence rates exceed 60% within 1 year if the underlying pressure exposure isn't addressed. Document this counseling and arrange wheelchair seating evaluation pre-op.

Debridement — indicated for all non-viable tissue except stable heel eschar and palliative wounds:
Surgical reconstruction (plastic surgery):
Adjunctive therapies:
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Special Populations — Elderly and Renal/Hepatic Impairment

— Age-related changes: thinner dermis, reduced subcutaneous fat, decreased capillary density, slower epidermal turnover, reduced sensation, polypharmacy-induced sedation/hypotension.

— Higher prevalence of malnutrition, dehydration, dementia (cannot reposition or report pain), incontinence.

Avoid adhesive removal injuries — use silicone-based dressings and adhesive removers; skin tears are common but are NOT staged as pressure injuries.

— Polypharmacy review: minimize sedatives, anticholinergics, and chronic steroids that impair healing.

— Falls vs. pressure trade-off: bed/chair alarms and restraints can paradoxically increase immobility and pressure injury risk — restraint-free care is preferred.

— Protein needs are competing: wound healing needs 1.25–1.5 g/kg/day, but pre-dialysis CKD recommends restriction. In dialysis patients, protein goal is 1.2–1.4 g/kg/day — healing needs are usually met.

— Antibiotic dose adjustment (vancomycin levels, avoid nephrotoxic aminoglycosides if avoidable).

— Uremia impairs wound healing and platelet function (bleeding with debridement).

— Calciphylaxis can mimic pressure injury in dialysis patients — biopsy if necrotic ulcer in unusual location (thigh, abdomen).

— Low albumin (synthesis failure) ≠ malnutrition alone — don't over-supplement protein if hepatic encephalopathy risk.

— Coagulopathy (elevated INR) increases bleeding with sharp debridement — correct with vitamin K/FFP if active intervention planned.

— Ascites and edema strain skin and predispose to breakdown.

Key distinction: Low albumin in a chronically ill elderly patient reflects inflammation/illness severity more than nutritional status — use prealbumin trend, weight change, oral intake, and clinical context, not albumin alone, to assess nutritional adequacy and response to interventions.

Elderly (most-affected demographic):
Renal impairment (CKD, dialysis):
Hepatic impairment:
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Special Populations — Spinal Cord Injury, Pediatrics, Palliative, and Bariatric

— Lifetime pressure injury risk >80%; #1 cause of rehospitalization in chronic SCI.

— Ischial tuberosity ulcers from sitting are most common — wheelchair pressure mapping and pressure-redistribution cushion (ROHO, gel) mandatory.

— Teach pressure reliefs every 15–30 minutes (push-ups, lateral tilts).

— Autonomic dysreflexia can be triggered by pressure injury pain in T6 and above — sudden hypertension, headache, sweating above the lesion.

— Occiput is the #1 site (large head-to-body ratio); next are ears, sacrum, heels.

— Device-related injuries dominate: BiPAP, pulse-ox, IV boards, ECMO cannulae.

— Use Braden Q scale (modified for pediatrics, adds tissue perfusion/oxygenation).

— Neonatal skin is thin, easily injured by tape — use silicone dressings, gentle adhesives.

— Goals shift from healing to comfort, dignity, odor and exudate control, pain management.

Kennedy terminal ulcer and SCALE (Skin Changes At Life's End) — recognize as unavoidable; document with family.

— Reposition for comfort, not on a strict 2-hour schedule if it causes distress.

— Topical lidocaine, opioids for dressing-change pain; metronidazole gel for odor control.

— Skin folds (pannus, gluteal cleft) develop intertriginous moisture-associated damage often mistaken for Stage 1/2 — keep dry, antifungal as needed.

— Special bariatric beds and lifts to prevent staff injury and shear during repositioning.

— Atypical sites: under pannus, between thighs, behind knees from sitting.

Board pearl: A non-healing, undermined ulcer in a chronic SCI patient with foul drainage and chronic inflammation may harbor Marjolin's ulcer (SCC arising in chronic wound) — biopsy any pressure ulcer present >3 months without healing or with abnormal granulation tissue.

Spinal cord injury (SCI):
Pediatrics:
Palliative care / end-of-life:
Bariatric patients:
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Complications and Adverse Outcomes

Local wound infection: advancing erythema (>2 cm), warmth, tenderness, purulence, friable granulation, delayed healing.

Cellulitis of surrounding skin.

Abscess formation in undermined tracts — requires I&D.

Sinus tracts and fistulas — can communicate with bowel, bladder, joint space.

Heterotopic ossification within chronic wounds (esp. SCI).

Marjolin's ulcer: squamous cell carcinoma in chronic non-healing wound (>3 months) — biopsy any suspicious change.

Osteomyelitis (most common in Stage 4 sacral, ischial, trochanteric ulcers) — chronic, polymicrobial, requires surgical + 6 weeks IV antibiotics.

Septic arthritis of hip from trochanteric ulcer.

Bacteremia with translocation — Staph aureus (including MRSA), enterococci, anaerobes, gram-negatives.

Sepsis and septic shock — pressure ulcer–related sepsis carries mortality 50–60%.

Endocarditis seeding from bacteremia.

— Hypoalbuminemia from chronic exudate loss (large wound = 50+ g protein/day lost).

— Anemia of chronic disease.

— Chronic pain, depression, social isolation, body image distress.

— Loss of independence, long-term placement, caregiver burnout.

— CMS does not reimburse hospital-acquired Stage 3/4/unstageable/DTPI — direct hospital loss.

— Litigation: among the most common nursing home and hospital lawsuits in the US ("failure to prevent" is a frequent plaintiff theory).

Step 3 management: New fever, leukocytosis, hypotension, or altered mental status in a patient with a Stage 3/4 ulcer → blood cultures × 2, lactate, broad-spectrum antibiotics (vancomycin + piperacillin-tazobactam), fluid resuscitation, urgent surgical evaluation for debridement — pressure ulcer sepsis requires source control, not antibiotics alone.

Local complications:
Bone and joint complications:
Systemic complications:
Metabolic and quality-of-life complications:
Systems-level / financial:
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When to Escalate — ICU, Consult, and Inpatient Triage

— Suspected sepsis from a wound (fever + hypotension/tachycardia + Stage 3/4 ulcer).

— Cellulitis with systemic signs, failed outpatient antibiotics, or in immunocompromised host.

— Suspected osteomyelitis requiring biopsy/debridement.

— Need for surgical debridement of extensive necrotic tissue.

— Uncontrolled pain requiring IV opioids.

— Inability to manage wound at home (lack of caregiver, supplies, or skilled nursing).

— Septic shock requiring vasopressors.

— Necrotizing soft tissue infection (rapid spread, crepitus, bullae, pain out of proportion, gas on imaging) — surgical emergency, broad-spectrum antibiotics including clindamycin for toxin suppression.

Wound care/CWOCN nurse: all Stage 2 and higher; ideally within 24 hours of identification.

Plastic surgery: Stage 3/4 not healing at 4–6 weeks despite optimal care, candidates for flap reconstruction.

General/orthopedic surgery: urgent debridement, suspected osteomyelitis, sepsis source control.

Infectious disease: osteomyelitis, recurrent bacteremia, complex/resistant organisms.

Nutrition: Stage 3/4 or any non-healing wound, BMI <18.5 or recent weight loss.

Physical/occupational therapy: mobility, pressure relief training, wheelchair seating eval.

Palliative care: end-of-life or goals-of-care misalignment.

Psychiatry/social work: depression, placement, caregiver concerns.

— Communicate stage, location, dressing regimen, last assessment, devices.

CCS pearl: On a CCS sepsis case where the source is a sacral ulcer, simultaneous orders should include: blood cultures × 2, lactate, IV vancomycin + piperacillin-tazobactam, IVF bolus, surgery consult for debridement, wound care consult, and continued q2h turning — sequential ordering loses points; concurrent management wins.

Admit to hospital (from clinic or ED):
ICU triage:
Specialist consults — who and when:
Transitions of care — high-risk handoffs:
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Key Differentials — Other Skin Breakdown Over Bony Areas

— Diffuse, ill-defined erythema in skin folds and over the buttocks/perineum, often with satellite lesions if candidal overlay.

— Typically symmetric, not localized to a bony prominence, and shape conforms to moisture exposure, not pressure point.

— Tx: barrier cream (zinc oxide), manage incontinence, antifungal if candidal.

— Traumatic separation of epidermis from dermis (shear/friction during transfer or tape removal).

— Common in elderly forearms and shins; NOT staged as pressure injuries — use ISTAP classification.

— Erythema, blistering, or epidermal stripping under tape/dressing edges.

— Prevention: silicone-based adhesives, gentle removal, skin prep barriers.

— Plantar surface, weight-bearing area (metatarsal heads, heel), punched-out, surrounded by callus, in patient with peripheral neuropathy.

— Pathophysiology: neuropathy + pressure + ± ischemia, NOT classified as a pressure injury despite pressure component.

— Distal toes, dorsum of foot, lateral malleolus; "punched-out," pale base, painful, cool extremity, diminished pulses, ABI <0.9.

— Heel ulcers in patients with PAD may be mixed pressure + arterial — check ABI before debridement.

— Medial gauche/malleolus, irregular borders, shallow, heavy exudate, hemosiderin staining, edema.

— Tx: compression (after ruling out arterial disease).

Key distinction: Location and shape distinguish pressure from moisture damage — pressure injuries are localized over bony prominences with shapes mirroring the underlying bone; IAD is diffuse, in skin folds, and follows the contour of moisture exposure. Both can coexist (combined IAD + Stage 2 sacral pressure injury) and require both interventions.

Moisture-associated skin damage (MASD) / Incontinence-associated dermatitis (IAD):
Skin tears:
Medical adhesive–related skin injury (MARSI):
Diabetic foot ulcer:
Arterial (ischemic) ulcer:
Venous stasis ulcer:
Neuropathic ulcer: at sites of repetitive trauma in insensate skin (leprosy, neuropathy).
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Key Differentials — Systemic and Less Common Mimickers

— Dialysis or advanced CKD patient, painful violaceous retiform necrotic plaques on adipose-rich areas (thighs, abdomen, breasts) — atypical locations for pressure.

— Dx: biopsy showing calcified small vessels; treat with sodium thiosulfate, manage calcium-phosphate product, wound care.

Mortality 60–80% at 1 year.

— Rapidly expanding ulcer with violaceous, undermined border and pathergy (worsens with debridement).

— Associated with IBD, RA, hematologic malignancy.

— Tx: immunosuppression (steroids, cyclosporine, biologics) — debridement worsens it. A classic Step 3 trap: don't debride a pyoderma gangrenosum lesion mistaken for an infected pressure ulcer.

— Palpable purpura progressing to necrotic ulcers, often on legs, with systemic features.

— Marjolin's ulcer (SCC in chronic wound), basal cell, melanoma — biopsy any chronic non-healing wound.

— Pain out of proportion, rapid spread, bullae, crepitus, hemodynamic instability — surgical emergency.

— Grouped vesicles, dermatomal (zoster) or perineal (HSV), preceding pain — not pressure-induced.

— Sloughing skin in setting of new medication, mucosal involvement — not pressure.

— Heating pads, hot packs, urine/stool maceration with heat — pattern follows exposure, not bony prominence.

Board pearl: A rapidly worsening ulcer that enlarges with each debridement attempt and has a violaceous, undermined border in a patient with IBD or RA is pyoderma gangrenosum — stop debriding, biopsy edge to exclude infection/malignancy, start systemic immunosuppression.

Calciphylaxis (calcific uremic arteriolopathy):
Pyoderma gangrenosum:
Vasculitis (e.g., cryoglobulinemia, ANCA-associated):
Cutaneous malignancy:
Necrotizing soft tissue infection:
Herpes zoster / herpes simplex:
Drug-induced (fixed drug eruption, SJS/TEN):
Burns (chemical or thermal):
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Secondary Prevention and Long-Term Plan

— Confirmed pressure-redistribution mattress at home (Medicare covers Group 1–3 support surfaces with documentation of qualifying ulcer/condition).

— Wheelchair cushion fitted (ROHO, gel, or air) for non-ambulatory patients — Medicare covers with seating eval.

— Caregiver trained in repositioning, transfer techniques, dressing changes, and skin inspection (return demonstration documented).

— Written wound care orders: cleanser, primary dressing, secondary dressing, frequency, signs to report.

— Home health referral with wound care nursing, PT, OT.

— Adequate supplies for at least 2 weeks; DME order placed before discharge.

— Nutrition plan: oral supplements (e.g., arginine/zinc/antioxidant–enriched), follow-up with dietitian.

— Incontinence management plan and supplies.

— SCI patients: lifelong daily skin inspection (mirror or caregiver), pressure-relief schedule, annual wheelchair seating reassessment, smoking cessation (smoking doubles recurrence).

— LTC residents: facility-level QI bundles, Braden on admission and weekly, turning schedules with documentation.

— Optimize glycemic control (A1c <8% for wound healing).

— Minimize systemic steroids; if unavoidable, vitamin A 25,000 IU/day may partially offset (consult before initiating).

— Smoking cessation counseling, varenicline/bupropion/NRT as appropriate.

— Manage edema (diuretics, compression after confirming arterial adequacy).

— Tetanus update if last >5 years and contaminated wound.

— Pneumococcal and influenza vaccination in chronically ill patients.

Step 3 management: Before discharging any patient with a Stage 3/4 pressure ulcer, confirm DME (mattress, cushion), home health wound care, dietitian follow-up, and a scheduled wound clinic visit within 1–2 weeks — gaps in this transition are the most common cause of 30-day readmission and the most common patient-safety failure tested.

Discharge planning checklist:
Long-term prevention in chronic conditions:
Medications relevant to healing:
Vaccinations:
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Follow-Up, Monitoring, and Rehabilitation

— Stage 1: resolves in days with offloading.

— Stage 2: 1–3 weeks.

— Stage 3: 1–4 months.

— Stage 4: 3 months to >1 year; many never fully heal.

— Expect ~20–40% wound area reduction at 2–4 weeks if healing trajectory is adequate.

— Measure length × width × depth weekly; track on PUSH tool (Pressure Ulcer Scale for Healing) — score combines area, exudate, tissue type; declining score = healing.

— Photograph at standardized intervals.

— Reassess pain, nutritional intake, mood, caregiver capacity.

— Reassess pressure-redistribution surface and offloading adherence.

— <30% area reduction at 4 weeks → reconsider diagnosis (biopsy for malignancy or atypical etiology), evaluate for osteomyelitis (MRI), assess perfusion (ABI), reassess nutrition, infection, offloading adherence.

— PT: progressive mobility, transfer training, pressure-relief techniques.

— OT: ADL adaptation, seating/positioning, home safety.

— Wheelchair seating clinic: pressure mapping every 1–2 years and after any significant weight change in SCI/chronic users.

— Screen for depression (PHQ-9) — chronic wounds correlate with depression and impaired healing.

— Caregiver respite, support groups.

— Stage, location, measurements, treatment, response — clear documentation is medicolegal protection and CMS-required.

CCS pearl: On a follow-up clinic visit for a Stage 3 sacral ulcer at 4 weeks, if the wound has not reduced by ≥30%, the highest-yield CCS actions are: order MRI to rule out osteomyelitis, reassess nutrition (prealbumin), confirm offloading adherence, and consider plastic surgery referral — escalating care, not just changing the dressing, scores correctly.

Expected healing timeline (with optimal care):
Monitoring at each visit (wound clinic or home health):
Trigger for reassessment of plan (non-healing wound):
Rehabilitation:
Psychosocial:
Documentation:
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Ethical, Legal, and Patient Safety Considerations

— Hospital-acquired Stage 3, 4, unstageable, and DTPI are non-reimbursable HACs; reported publicly on Hospital Compare.

— Nursing home Stage 2+ pressure ulcers are reported on Nursing Home Compare.

— Joint Commission tracer methodology audits skin assessment timing and Braden documentation.

"Present on admission" (POA) designation is critical — must document complete skin assessment within 24 hours of admission with photograph if possible. Failure to document POA = presumed hospital-acquired.

— Use precise NPIAP staging language; avoid colloquial terms ("bedsore," "decubitus").

— Never reverse-stage; describe healing wounds as "healing Stage X."

Refusal of repositioning by a competent patient (pain, dyspnea, preference): document discussion of risks, alternative interventions (different surface, smaller position changes, premedication for pain), and patient understanding. Autonomy is respected, but document thoroughly.

— Family insistence on "doing everything" for a dying patient with a Kennedy terminal ulcer: reframe goals; involve palliative care; document SCALE/Kennedy designation.

— Stage 3/4 pressure ulcers in dependent adults or elders may trigger elder abuse / Adult Protective Services reporting if neglect is suspected (lack of repositioning, unsanitary conditions, contracture, multiple wounds, malnutrition, dehydration in a home or facility setting). Physicians are mandatory reporters in all US states.

— Pediatric pressure injuries in neglect contexts → child protective services.

— Stage 1 detection rates are lower in darkly pigmented skin — train staff in tactile (warmth, induration, bogginess) and comparative assessment to reduce disparity.

— Pressure ulcer status and dressing regimen must be in every transfer summary (SNF, home, rehab) — omissions are common root causes in readmissions and litigation.

Board pearl: A nursing home resident transferred to ED with a Stage 4 sacral ulcer, contractures, dehydration, and weight loss requires APS referral for suspected elder neglect — the physician is a mandatory reporter, and the presence of clinical findings, not proof of neglect, triggers the obligation.

CMS / regulatory framework:
Documentation as patient safety and legal protection:
Informed consent edge cases:
Mandatory reporting:
Equity considerations:
Transition-of-care safety:
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High-Yield Associations and Rapid-Fire Facts

Step 3 management: Memorize the prevention bundle: turn q2h, 30° lateral tilt, heels off bed, HOB ≤30°, pressure-redistribution mattress, skin/incontinence care, nutrition optimization, Braden documentation — this bundle answers most Step 3 prevention questions.

Most common location overall: Sacrum/coccyx (~40%).
Second most common: Heel (~20%) — and most preventable with heel floating.
#1 site in pediatrics: Occiput.
#1 site in chronic wheelchair users: Ischial tuberosity.
#1 site in side-lying patients: Greater trochanter.
Capillary closing pressure: ~32 mmHg.
Time to Stage 1 injury: as short as 30–60 minutes of unrelieved pressure.
DTPI evolution time: 24–72 hours to declare full depth.
Braden Scale cutoffs: ≤18 at risk, ≤12 high risk; 6 subscales.
Protein requirement for healing: 1.25–1.5 g/kg/day (up to 2 g/kg/day in severe wounds with normal renal function).
Calorie requirement: 30–35 kcal/kg/day.
Mattress recommendation: high-spec foam universal at-risk; alternating-pressure or low-air-loss for high-risk/existing Stage 3-4.
Head of bed: ≤30° to reduce sacral shear, when medically permissible.
Stable heel eschar: Do not debride — paint with povidone-iodine, offload.
Wet-to-dry dressings: Outdated, discouraged.
Topical antibiotics on pressure ulcers: Not recommended.
Massage of bony prominences: Contraindicated (causes deep tissue damage).
Probe-to-bone test: PPV ~89% for osteomyelitis in chronic ulcer.
MRI: Imaging gold standard for osteomyelitis.
CMS HAC: Stage 3, 4, unstageable, DTPI — non-reimbursable if hospital-acquired.
Kennedy terminal ulcer: butterfly/pear-shaped sacral lesion in dying patients; unavoidable.
SCALE: Skin Changes At Life's End — unavoidable end-of-life skin breakdown.
Marjolin's ulcer: SCC in chronic wound >3 months — biopsy.
Pyoderma gangrenosum mimic: violaceous undermined border, pathergy — don't debride.
Reverse staging: Never used; describe "healing Stage X."
Best evidence for nutrition: Arginine + zinc + antioxidant–enriched oral supplements reduce incidence and improve healing.
Cushion of choice in SCI: ROHO or gel with pressure mapping.
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Board Question Stem Patterns

Key distinction: When a stem describes any chronic non-healing wound >3 months with atypical granulation or heaped edges, the answer pivots from wound care to biopsy to exclude Marjolin's ulcer (SCC).

Stem 1 — staging: "An 82-year-old immobile woman has a 4-cm sacral wound with visible subcutaneous fat; no muscle or bone seen…" → Stage 3. Trap answers: Stage 2 (no fat), Stage 4 (no muscle/bone), unstageable (base not obscured).
Stem 2 — DTPI: "Postoperative day 2 after 6-hour spine surgery, 1.5-cm intact maroon discoloration over sacrum, non-blanching…" → Deep tissue pressure injury. Action: offload, alternating-pressure mattress, monitor evolution.
Stem 3 — stable heel eschar: "Bedbound diabetic with dry, intact black eschar on heel; foot is warm, palpable pulses…" → Do not debride; paint with povidone-iodine, offload heel. Wrong answer: sharp debridement.
Stem 4 — colonization vs infection: "Stage 3 ulcer with healthy granulation, swab grows MRSA, patient afebrile…" → No systemic antibiotics; continue local wound care. Wrong answer: vancomycin.
Stem 5 — sepsis source: "Febrile, hypotensive nursing home resident with foul-smelling Stage 4 sacral ulcer, WBC 22…" → Blood cultures, vancomycin + piperacillin-tazobactam, fluids, surgical debridement consult.
Stem 6 — osteomyelitis: "Stage 4 ischial ulcer 8 weeks, bone palpable on probing…" → MRI; bone biopsy for culture; 6 weeks IV antibiotics after surgical debridement.
Stem 7 — pyoderma gangrenosum mimicker: "Patient with ulcerative colitis develops rapidly enlarging ulcer with violaceous undermined edge; worsens after debridement…" → Systemic steroids; biopsy edge. Wrong: more debridement.
Stem 8 — Kennedy ulcer: "Hospice patient develops butterfly-shaped sacral discoloration over 24 hours…" → Comfort care, document as Kennedy terminal ulcer.
Stem 9 — incontinence-associated dermatitis vs Stage 2: "Diffuse erythema in perineum and gluteal cleft with satellite lesions…" → IAD; barrier cream and antifungal.
Stem 10 — neglect: "SNF resident admitted with Stage 4 sacral ulcer, dehydration, contractures…" → APS report.
Stem 11 — documentation/HAC: Skin not assessed for 48 hours after admission, Stage 3 found → counted as hospital-acquired; non-reimbursable.
Stem 12 — prevention bundle on CCS: Immobile post-stroke patient → Braden, turn q2h, pressure mattress, nutrition consult, heels off bed.
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One-Line Recap

Pressure injuries are localized ischemic and shear-mediated soft tissue damage over bony prominences or under devices that are largely preventable through systematic risk assessment, repositioning, pressure redistribution, skin and moisture care, and nutrition optimization — and that are staged by deepest visible tissue, never reverse-staged, with management escalating from offloading and moist wound care to debridement, culture-directed antibiotics for true infection, and surgical reconstruction for refractory Stage 3/4 disease.

Board pearl: If a Step 3 question gives you an immobile, malnourished, incontinent, or sensation-impaired patient — order the prevention bundle before you do anything else; if a wound already exists — stage it precisely, debride non-viable tissue (except stable heel eschar), match dressing to exudate, treat only clinical infection, optimize nutrition and offloading, and escalate to MRI/biopsy/plastics when healing stalls.

Prevention is the test answer: Braden ≤18 triggers the bundle — q2h turn, 30° lateral tilt, heel float, HOB ≤30°, pressure-redistribution surface, incontinence/moisture care, nutrition (1.25–1.5 g protein/kg/day).
Staging mantra: Stage 1 = intact non-blanching erythema; Stage 2 = partial dermis, no slough; Stage 3 = fat visible; Stage 4 = muscle/tendon/bone; Unstageable = obscured base; DTPI = intact or non-intact persistent deep discoloration. Never reverse-stage.
Pitfall pearls: Don't debride stable heel eschar; don't treat colonization with antibiotics; don't use wet-to-dry dressings or topical antibiotics; don't massage bony prominences; don't miss Marjolin's ulcer, pyoderma gangrenosum, Kennedy terminal ulcer, or elder neglect.
Systems pearl: Hospital-acquired Stage 3, 4, unstageable, and DTPI are CMS-designated never events — document skin assessment within 24 hours of admission with POA designation, communicate wound status at every handoff, and arrange DME, home health, nutrition, and wound clinic follow-up before any discharge.
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