Patient Safety & Systems-Based Practice

Pressure injury prevention bundles

Clinical Overview and When to Suspect Pressure Injury Risk

— ~2.5 million US patients/year develop a hospital-acquired pressure injury (HAPI)

— Stage 3, Stage 4, unstageable, and deep tissue injuries acquired in-hospital are CMS "never events" — non-reimbursable and publicly reported

— Each HAPI adds ~$20,000–$150,000 in costs and increases mortality, LOS, and litigation risk

— Immobility (stroke, spinal cord injury, post-op, sedated/vented, restraints)

— Sensory impairment (neuropathy, dementia, delirium)

— Malnutrition, low albumin, weight loss, BMI extremes

— Incontinence or moisture (sweat, wound drainage, NGT/feeding tube leakage)

— Hemodynamic instability, vasopressors, low perfusion states

— Medical devices: ETT, NG tube, BiPAP mask, cervical collar, SCDs, Foley, casts

Board pearl: A Stage 3 or 4 PI present on admission is not a never event — documentation of "present on admission" within 24 hours is essential for both clinical and reimbursement reasons. Conversely, a Stage 2 PI that worsens to Stage 4 in-hospital is reportable as hospital-acquired.

Step 3 management: On every admission, the expected order set includes a validated risk assessment (Braden or Norton) within 8 hours, baseline head-to-toe skin exam, and initiation of a prevention bundle for any at-risk patient — this is the systems-based answer Step 3 rewards.

Definition: Pressure injury (PI) = localized damage to skin and/or underlying soft tissue, usually over a bony prominence or related to a medical device, resulting from sustained pressure, shear, friction, or microclimate (moisture/heat) disruption.

Scope of the problem:

When to suspect risk on admission:

Highest-risk care settings: ICU, OR (procedures >3 hr), ED boarding, long-term care, hospice, spinal cord rehab.

Time course: Tissue damage can begin within 2 hours of unrelieved pressure; deep tissue injury may not become visible for 24–72 hours after the inciting event.

Presentation Patterns and Key History

— Supine: sacrum/coccyx (most common overall), heels, occiput, scapulae, elbows

— Lateral: greater trochanter, lateral malleolus, ear

— Prone (ARDS/COVID era): forehead, chin, chest, iliac crests, knees, dorsum of feet

— Seated: ischial tuberosities (wheelchair users), sacrum

— Nasal bridge from BiPAP/CPAP mask, ear from O2 tubing or ETT ties

— Lip/tongue from oral ETT, neck from cervical collar or tracheostomy flange

— Penis/urethra from improperly secured Foley, nares from NG tube

— MDRPIs now account for ~30% of hospital-acquired PIs

— Duration of immobility before admission (e.g., "down for 12 hours" after fall)

— Prior PI history (strongest single predictor of recurrence)

— Continence status, recent diarrhea, ostomy output

— Nutritional intake, recent weight loss, dietary restrictions

— Functional baseline: ambulates independently? Bed-to-chair? Total care?

— Caregiver availability and turning capacity at home

— Burning or aching over bony area

— Persistent redness that "doesn't go away" after repositioning

— New drainage, odor, or staining on linens/clothing

— In neuropathic patients (SCI, diabetes): often asymptomatic — discovery is purely exam-based

Key distinction: A Stage 1 PI is intact skin with non-blanchable erythema. If the redness blanches with light pressure, it is reactive hyperemia, not a PI — but it is a warning sign requiring offloading. Darkly pigmented skin may not show erythema; instead look for temperature change, induration, or color difference compared to surrounding skin.

Board pearl: A patient found down from a fall who presents with a purple, intact, boggy area over the sacrum has a deep tissue pressure injury (DTPI) — this is present-on-admission, often evolves to Stage 3/4 over days, and should be documented and photographed immediately.

Common anatomic sites (by position):

Device-related pressure injuries (MDRPI):

Key historical elements to elicit/document:

Symptoms patients/families may report:

Physical Exam Findings and Skin Assessment

— Inspect all bony prominences, skin folds, perineum, heels (lift the leg), occiput, and under every medical device (lift the BiPAP mask, rotate ETT, check under cervical collar)

— Palpate for warmth, coolness, boggy/indurated tissue, edema

— Compare side-to-side; in dark skin, use natural and halogen light, palpate for temperature differences

— Stage 1: Intact skin, non-blanchable erythema

— Stage 2: Partial-thickness loss; pink/red wound bed or intact/ruptured serum-filled blister; no slough, no granulation, no fat visible

— Stage 3: Full-thickness; subcutaneous fat may be visible; slough/eschar may be present but does not obscure depth; may have undermining/tunneling

— Stage 4: Full-thickness with exposed bone, tendon, muscle, or fascia

— Unstageable: Full-thickness obscured by slough or eschar — stage cannot be determined until base visible

— Deep tissue pressure injury (DTPI): Intact or non-intact skin with persistent non-blanchable deep red, maroon, or purple discoloration, or epidermal separation revealing dark wound bed/blood-filled blister

Key distinction: Do not reverse-stage healing wounds. A Stage 4 PI that fills with granulation tissue becomes a "healing Stage 4," not a Stage 2 — because the lost muscle/fascia is replaced by scar, not original tissue.

CCS pearl: On Step 3 CCS, when admitting a high-risk patient (stroke, hip fracture, SCI), order "skin assessment on admission and every shift" along with the Braden score — these are credit-yielding routine orders that mirror real practice.

Structured head-to-toe skin exam — perform on admission, every shift, at transfers of care, and after procedures >3 hr:

NPIAP staging (2016, current US standard):

Document for each wound: location, stage, length × width × depth (cm), undermining/tunneling (clock position), wound bed (% granulation/slough/eschar), exudate, periwound skin, odor, pain, and photo with ruler per institutional policy.

Risk Assessment Tools and Initial Workup

— Six subscales: sensory perception, moisture, activity, mobility, nutrition, friction/shear

— Score range 6–23; lower = higher risk

— Cutoffs: ≤9 very high, 10–12 high, 13–14 moderate, 15–18 mild, ≥19 minimal/no risk

— Limitations: less predictive in ICU, pediatric, and SCI populations

— Norton Scale (older, 5 items — physical condition, mental state, activity, mobility, incontinence; ≤14 = at risk)

— Waterlow (UK, broader risk factors)

— Braden Q for pediatrics

— On admission within 8 hours, every shift in acute care, weekly in LTC, with any change in condition (post-op, new vasopressors, transfer to ICU)

— Albumin/prealbumin — marker of inflammation more than nutrition; prealbumin (half-life 2 d) tracks acute change

— CBC (anemia impairs healing), CRP, glucose/HbA1c (hyperglycemia impairs healing)

— BUN/Cr, electrolytes (dehydration worsens skin perfusion)

— Zinc, vitamin C, vitamin D if chronic wound or malnutrition suspected

— MRI for suspected osteomyelitis under Stage 3/4 wound

— Plain films low sensitivity early; bone biopsy is gold standard for osteomyelitis dx

Board pearl: Albumin alone is not a reliable nutritional marker — it falls in any acute inflammatory state. Use it as a prognostic risk marker, but assess nutrition with a validated tool (MNA, NRS-2002) and a registered dietitian consult.

Step 3 management: A Braden score ≤18 should automatically trigger the prevention bundle order set: pressure-redistributing surface, turning schedule, heel offloading, moisture management, nutrition consult, and skin barrier products. On CCS, order "nutrition consult" for any Braden ≤14 or albumin <3.0.

Braden Scale (most commonly tested):

Other validated tools:

Frequency of reassessment:

Adjunct laboratory workup (not diagnostic of PI but informs prevention/healing):

Imaging (only for complicated PIs, not screening):

Advanced Assessment — Differentiating Wound Types and Confirming Diagnosis

— Wound culture: Only useful if signs of infection (erythema >2 cm, purulence, warmth, fever, leukocytosis). Surface swabs poor; tissue biopsy or curettage preferred.

— MRI with contrast: Best non-invasive test for osteomyelitis under sacral/heel PI; assess sinus tracts and deep abscess

— Bone biopsy: Gold standard for osteomyelitis; obtain via separate tract, not through wound, to avoid contamination

— ABI/toe pressures: In heel or lower extremity wounds, rule out arterial insufficiency before applying compression or aggressive debridement (ABI <0.5 = critical limb ischemia, consult vascular)

— Transcutaneous oximetry (TcPO2): Predicts healing capacity in ischemic wounds

— Moisture-associated skin damage (MASD/IAD): Diffuse, irregular borders, in skin folds or perineum, not over bony prominence; due to urine/stool/sweat

— Skin tear: Mechanical/friction; flap of skin present

— Diabetic foot ulcer: Plantar surface, over metatarsal heads, painless in neuropathic foot

— Arterial ulcer: Distal toes, punched-out, dry, pale, painful, absent pulses

— Venous ulcer: Medial malleolus, shallow, irregular, surrounded by hemosiderin/lipodermatosclerosis

Key distinction: Incontinence-associated dermatitis (IAD) vs Stage 1/2 PI — IAD is in moisture-exposed areas, has irregular non-anatomic borders, and is intact red/macerated skin. Misclassification leads to wrong intervention (barrier cream vs offloading).

CCS pearl: Heel ulcer + diabetes + absent pedal pulses → order ABI before any debridement or compression; consult vascular surgery.

Diagnosis is clinical — based on location over bony prominence/device, history of pressure, and morphology. No confirmatory test exists for PI itself.

Confirmatory/advanced studies are used to distinguish or evaluate complications:

Photography: Use standardized lighting, ruler, patient identifier; required documentation in many institutions and medicolegal protection.

Pain assessment: PIs are often painful even at Stage 1; use numeric scale and Pain Assessment in Advanced Dementia (PAINAD) for nonverbal patients.

Distinguishing similar-appearing wounds on exam:

The Prevention Bundle — Core Components and Implementation Logic

— Surface — pressure-redistributing mattress/cushion

— Skin inspection — every shift and at transitions

— Keep moving — repositioning schedule

— Incontinence/moisture management

— Nutrition and hydration

— Bed-bound: turn every 2 hours (Q2H); chair-bound or ICU on pressure-redistributing surface may extend to Q4H if tissue tolerance documented

— Use 30-degree lateral tilt, not 90-degree side-lying (avoids direct trochanter pressure)

— Head of bed ≤30° when feasible (higher angles shear sacrum); balance against VAP/aspiration risk

— Float heels off the bed entirely with pillow under calves — heels are poorly perfused and a leading HAPI site

— Standard hospital foam mattress for low-risk

— Powered alternating-pressure or low-air-loss mattress for high-risk (Braden ≤12, existing PI, post-op flap)

— Air-fluidized beds for Stage 3/4 trunk wounds or flap reconstruction

— pH-balanced cleansers, no rubbing

— Apply barrier cream (zinc, dimethicone) or barrier film after each incontinence episode

— Avoid prolonged use of absorbent pads stacked under patient (trap heat/moisture)

— Aim 30–35 kcal/kg/d and 1.25–1.5 g/kg/d protein for at-risk or existing PI

— Arginine/zinc/vitamin C supplementation has modest evidence for Stage 2+ wounds

Step 3 management: On admission of a stroke patient with right hemiparesis, the bundle order set is: low-air-loss mattress, Q2H turning with 30° tilt, heel suspension boots, barrier cream PRN incontinence, nutrition consult, Braden Q-shift, daily skin assessment, and PT/OT consult for early mobilization.

The "SSKIN" bundle (widely used framework):

Evidence base: Bundle implementation reduces HAPI incidence by 50–70% in multiple QI studies (AHRQ toolkit, IHI). No single intervention alone matches bundle effect — this is the systems lesson.

Repositioning protocol:

Surfaces:

Moisture/skin care:

Nutrition:

Pharmacotherapy and Topical Management

— Acetaminophen scheduled first-line

— Topical lidocaine for procedural pain (dressing changes, debridement)

— Short-acting opioid 30 min before dressing changes for Stage 3/4

— Avoid chronic opioids when possible; use multimodal approach

— Stage 1: No dressing needed; offload and protect; transparent film optional

— Stage 2: Hydrocolloid or foam dressing; maintain moist wound environment; change q3–5 days

— Stage 3/4 with exudate: Foam, alginate (heavy exudate), or hydrofiber

— Stage 3/4 with slough/eschar: Autolytic debridement with hydrogel; enzymatic (collagenase); surgical/sharp for large necrotic burden

— Dry stable heel eschar: Do not debride — leave intact, paint with povidone-iodine, monitor; debridement converts a stable wound to an open one in often-ischemic tissue

— Topical: silver dressings, cadexomer iodine, medical-grade honey for critically colonized wounds

— Avoid routine topical antibiotics (bacitracin, neomycin) — sensitization and resistance

— Systemic antibiotics only for surrounding cellulitis, bacteremia, osteomyelitis, or sepsis; cover polymicrobial flora (staph, strep, anaerobes, gram-negatives) — e.g., piperacillin-tazobactam or ampicillin-sulbactam empirically

— Oral protein supplements; arginine 4.5 g + zinc + antioxidants formulations have RCT support for Stage 2+ healing

— Vitamin C 500 mg/d and zinc 40 mg/d only if documented deficiency

Board pearl: A swab culture from an open PI grows mixed flora — this reflects colonization, not infection. Treat only with clinical signs of infection (NERDS/STONEES criteria: non-healing, exudate, red friable tissue, debris, smell — or deeper signs: size↑, temperature↑, os exposed, new breakdown, exudate↑, erythema, smell).

Key distinction: Colonization vs infection is the most commonly missed concept — do not start antibiotics for a positive culture alone.

No systemic drug prevents pressure injury — prevention is mechanical and nutritional. Pharmacotherapy enters when PI exists or when treating complications.

Pain control:

Topical wound care by stage:

Antimicrobials — used only with infection, not colonization:

Nutritional pharmacotherapy:

Procedural and Surgical Management

— Sharp/surgical: Fastest; bedside or OR; required for extensive necrosis, suspected deep infection, or sepsis source control

— Enzymatic: Collagenase ointment daily; good for patients not surgical candidates

— Autolytic: Body's own enzymes under moisture-retentive dressing; slowest, gentlest

— Mechanical: Wet-to-dry largely abandoned (non-selective, painful); pulsed lavage and ultrasonic alternatives preferred

— Biologic: Maggot therapy for select chronic wounds

— Indicated for Stage 3/4 with adequate perfusion, controlled infection, and granulating base

— Contraindicated in untreated osteomyelitis, malignancy in wound, exposed vessels/organs, dry eschar, active bleeding

— Typical settings: −125 mmHg continuous; change q48–72h

— Indicated for Stage 3/4 wounds not healing with conservative care, especially in young patients with SCI

— Myocutaneous flaps (gluteal, tensor fascia lata, hamstring) for sacral/ischial/trochanteric PIs

— Post-op: air-fluidized bed, strict offloading for 4–6 weeks, bowel/bladder management, smoking cessation, optimized nutrition (albumin >3, HbA1c <7)

— Hyperbaric oxygen: not first-line for PI; reserved for refractory osteomyelitis or compromised flaps

— Skin substitutes/bioengineered grafts for select recalcitrant Stage 3 wounds

CCS pearl: A paraplegic patient with a Stage 4 ischial PI and exposed bone — order MRI pelvis with contrast, bone biopsy (not surface swab), plastic surgery consult, infectious disease consult, and nutrition optimization before any flap reconstruction. Premature surgery on infected bone fails.

Step 3 management: Before consenting for flap closure, document that smoking cessation, glycemic control (HbA1c <7%), albumin >3.0, treated osteomyelitis, spasticity control, and a durable home offloading plan are addressed — these systems-level steps are tested.

Debridement modalities (choose based on wound, patient, setting):

Negative pressure wound therapy (NPWT/wound vac):

Surgical reconstruction (plastic surgery consult):

Adjunctive procedures:

Special Populations — Elderly and Renal/Hepatic Impairment

— Thinner dermis, reduced collagen, decreased subcutaneous padding, slower healing

— Polypharmacy (sedatives, anticholinergics) → immobility and incontinence

— Higher rates of malnutrition, sarcopenia, and dementia limiting position changes

— Frailty assessment (Clinical Frailty Scale) on admission helps risk-stratify

— Even more aggressive heel offloading — heel PIs especially common

— Avoid adhesive dressings on fragile skin → use silicone-bordered or atraumatic

— Skin tears prevention: long sleeves, padded side rails, careful transfers

— Reposition with lift sheets, never drag (shear injury)

— Realistic goals-of-care conversation: in actively dying patients, comfort and dignity may supersede strict Q2H turning

— Uremia impairs wound healing and platelet function

— Edema from nephrotic syndrome or CKD increases skin fragility and maceration

— Dialysis access positioning constraints — coordinate turning with nephrology

— Drug dosing: adjust gabapentin for neuropathic wound pain, avoid NSAIDs, dose-adjust antibiotics for osteomyelitis (vancomycin, cefepime per CrCl)

— Phosphate binders and dietary restrictions can worsen nutritional status — engage renal dietitian

— Hypoalbuminemia → edema, poor healing

— Coagulopathy → bleeding with sharp debridement; check INR/platelets

— Avoid hepatotoxic analgesics; cap acetaminophen at 2 g/d in cirrhosis

— Ascites increases abdominal pressure and can contribute to peristomal/abdominal wall breakdown

Board pearl: The Kennedy terminal ulcer is a pear-shaped, rapidly evolving sacral wound appearing in the days to weeks before death — represents skin failure as part of multi-organ failure, not preventable nursing care failure. Document as such; this protects against unwarranted "never event" classification.

Key distinction: Skin failure (organ failure of the integument in dying patients) ≠ pressure injury from inadequate care. Documentation, family discussion, and palliative care involvement are essential.

Elderly (>65, especially >85):

Adjustments in elderly:

Renal impairment:

Hepatic impairment:

Special Populations — Pediatrics, Pregnancy, SCI, and Critical Care

— Use Braden Q or Glamorgan scale

— Occiput is the most common site (large head-to-body ratio in infants)

— Devices (pulse ox probes, BP cuffs, IVs, ECMO cannulae) cause most pediatric HAPIs

— Rotate pulse ox probe every 4 hours; pad under devices

— Neonatal skin: stratum corneum immature until ~30 weeks; use water-based, no alcohol; minimize adhesives

— Prolonged labor, epidural-induced immobility, lithotomy position → sacral and heel risk

— Reposition laterally during labor; pad stirrups; assess skin post-delivery, especially after C-section

— Lifetime PI prevalence ~85%; leading cause of rehospitalization

— Ischial tuberosities (sitting), sacrum, trochanters, heels

— Wheelchair pressure mapping, custom cushions (ROHO, gel), and weight shifts every 15–30 minutes when seated

— Education on daily skin checks with mirror, bowel/bladder program, smoking cessation

— Autonomic dysreflexia can be triggered by a deep PI in T6-and-above injuries — sudden HTN, headache → check for noxious stimuli including occult PI

— Vasopressors, sedation, paralytics, ECMO, prone positioning all multiply risk

— Prone positioning (ARDS): pad forehead, chin, chest, iliac crests, knees; reposition head Q2H; protect ETT and lines

— Daily sedation interruption and early mobility (when safe) are PI prevention strategies, not just delirium/VAP measures

— Hemodynamic instability may justify temporary deferral of turning — document medical rationale

Step 3 management: In a proned COVID-ARDS patient, order: foam dressings prophylactically over forehead/chin/chest/iliac crests, Q2H head repositioning, eye protection, careful ETT/line placement, and reverse-prone (supine) skin check at each pronation cycle.

CCS pearl: SCI patient readmitted with Stage 4 ischial PI — also order screening for depression, substance use, and caregiver assessment; psychosocial factors drive recurrence.

Pediatrics:

Pregnancy:

Spinal cord injury:

Critical care/ICU:

Complications and Adverse Outcomes

— Cellulitis: Surrounding erythema >2 cm, warmth, induration, fever

— Wound infection: Increased exudate, odor, friable granulation, delayed healing

— Abscess: Fluctuance, may require I&D

— Sinus tract/fistula: Especially sacral PIs communicating with rectum or bladder

— Undermining/tunneling: Wound larger beneath than at surface opening

— Suspected when wound probes to bone, fails to heal despite optimal care, or chronic drainage persists

— "Probe-to-bone" test sensitive but not specific

— MRI preferred imaging; bone biopsy for definitive dx and culture-directed therapy

— Treatment: 6 weeks IV antibiotics (longer for retained necrotic bone), surgical debridement of involved bone

— PI is the source in 1–3% of nosocomial bacteremias; mortality up to 50%

— Polymicrobial; common organisms: S. aureus (incl. MRSA), Enterococcus, Pseudomonas, Bacteroides, E. coli

— Squamous cell carcinoma arising in chronic non-healing wound (>10+ years)

— Biopsy any chronic PI with atypical appearance, rolled edges, or sudden growth

— Chronic pain, depression, social isolation

— Protein-losing wounds → hypoalbuminemia, anemia of chronic disease

— Heterotopic ossification (in SCI)

— Amyloidosis (rare, with very chronic wounds)

— Prolonged LOS (avg +4–10 days)

— Readmissions, litigation (PIs are the 2nd most common cause of malpractice claims in nursing homes)

— CMS non-reimbursement for hospital-acquired Stage 3/4

Board pearl: New-onset fever and leukocytosis in a patient with a Stage 4 sacral PI — assume the wound is the source until proven otherwise. Obtain blood cultures, deep tissue (not swab) culture, lactate, and start empiric broad-spectrum antibiotics covering MRSA, gram-negatives, and anaerobes.

Key distinction: A non-healing PI after 2 weeks of optimal therapy → reassess for osteomyelitis, undiagnosed ischemia, malnutrition, ongoing pressure, or malignancy — not just "needs more dressings."

Local complications:

Osteomyelitis:

Bacteremia and sepsis:

Marjolin ulcer:

Systemic and functional complications:

Healthcare system complications:

When to Escalate Care — Consults, ICU Triage, and Inpatient Decisions

— Any Stage 2 or higher, any DTPI, any unstageable wound

— Complex dressing selection, NPWT initiation, education

— Stage 3/4 with exposed bone, tendon, joint

— Failure to progress after 4–6 weeks of optimal care

— Pre-operative planning for flap reconstruction

— Sacral PI with suspected fistula to rectum

— Diverting colostomy consideration to enable healing of large sacral wounds

— Suspected osteomyelitis, polymicrobial bacteremia, multidrug-resistant organisms

— Prolonged IV antibiotics planning, OPAT coordination

— Heel or lower extremity PI with ABI <0.7, absent pulses, dependent rubor

— Revascularization before debridement in ischemic limbs

— Braden ≤14, albumin <3.0, BMI <18.5, any Stage 2+ PI

— Kennedy terminal ulcer, advanced dementia/frailty, goals-of-care discussions when aggressive prevention conflicts with comfort

— Severe sepsis from wound source

— Massive bleeding from debridement (especially in coagulopathic patients)

— Hemodynamic instability post-flap reconstruction

— Sepsis, suspected osteomyelitis, deep abscess requiring OR, uncontrolled pain, failure of outpatient management

CCS pearl: On CCS, when a nursing home patient arrives with a febrile Stage 4 sacral PI, the credit-yielding sequence is: ABCs → IV access → blood cultures × 2 → wound culture (deep) → CBC, BMP, lactate, CRP → IV fluids → empiric broad-spectrum antibiotics → MRI pelvis → ID and plastics consults → nutrition consult → low-air-loss bed → social work for placement planning.

Step 3 management: Document rationale for every consult in the note — Step 3 vignettes reward the candidate who recognizes that PI care is inherently multidisciplinary.

Wound care nurse / WOC nurse consult:

Plastic surgery consult:

General/colorectal surgery consult:

Infectious disease consult:

Vascular surgery consult:

Nutrition/registered dietitian:

Palliative care:

ICU triage triggers (PI-related):

Hospital admission for outpatient/LTC PI:

Key Differentials — Other Skin Breakdown Over Pressure Areas

— Incontinence-associated dermatitis (IAD): Diffuse erythema/maceration in perineum, gluteal cleft, inner thighs; irregular borders; spares bony prominence specifically

— Intertriginous dermatitis: Skin folds (under breasts, panniculus, groin)

— Periwound MASD: Around heavily exudating wounds

— Treatment: moisture removal, barrier products, treat underlying incontinence/exudate

— Mechanical trauma (friction, shear, blunt force) → epidermal/dermal separation

— Often in elderly forearms, hands, lower legs

— Treatment: approximate skin flap, non-adherent dressing, prevent recurrence with sleeves/pads

— Tape stripping, tension blisters, contact dermatitis under adhesives

— Prevention: skin prep, silicone-based adhesives, atraumatic removal techniques

— Superficial epidermal loss from rubbing (sheets, restraints) — no necrosis

— Distinguished from Stage 2 PI by mechanism and lack of bony prominence association

— Heating pads, hot packs left on insensate patients (SCI, diabetes, sedation) → may mimic Stage 2/3 PI

— Chemical burns from prolonged contact with stool, urine, or wound exudate

— End-stage renal disease, painful violaceous plaques → necrosis, often on thighs/abdomen

— Severe pain disproportionate to appearance is the clue

— Biopsy confirms; treatment with sodium thiosulfate, parathyroidectomy

Key distinction: IAD vs Stage 2 PI — IAD has diffuse, irregular borders in moisture-exposed (not bony) areas, partial thickness, with surrounding satellite lesions if candidal. Stage 2 PI is over a bony prominence with discrete borders. Treatment diverges sharply: barrier cream + continence management for IAD vs offloading + dressings for PI.

Board pearl: A dialysis patient with intensely painful black eschars on the thighs — think calciphylaxis, not pressure injury. Misdiagnosis delays sodium thiosulfate therapy.

Moisture-associated skin damage (MASD):

Skin tears (ISTAP classification):

Medical adhesive-related skin injury (MARSI):

Friction injury:

Burns (thermal, chemical):

Calciphylaxis:

Key Differentials — Other-Category Causes of Chronic Wounds

— Distal toes, lateral malleolus, dorsum of foot

— Punched-out, dry, pale base, severe pain, worse with elevation, better dangling

— Absent pulses, ABI <0.9 (often <0.5), hair loss, dependent rubor

— Management: revascularization; avoid compression until perfusion confirmed

— Medial malleolus (gaiter area), shallow, irregular, exudative

— Hemosiderin staining, lipodermatosclerosis, varicosities, edema

— ABI normal; treat with compression therapy (after ruling out arterial), leg elevation, treat reflux

— Plantar surface over metatarsal heads (most often first or fifth)

— Painless, punched-out, surrounded by callus

— Glucose control, total contact casting for offloading, treat osteomyelitis aggressively

— Rapidly enlarging painful ulcer with violaceous undermined borders, often on lower extremities

— Associated with IBD, RA, hematologic malignancy

— Pathergy — worsens with debridement (key differential point!)

— Treatment: systemic steroids, immunosuppressants

— Marjolin ulcer (SCC in chronic wound), BCC, melanoma, cutaneous lymphoma

— Biopsy any atypical or non-healing wound

— Irregular borders, palpable purpura nearby, systemic features

— Cryoglobulinemia, ANCA-associated, polyarteritis nodosa

— Necrotizing fasciitis (rapidly progressive, pain out of proportion, crepitus)

— Ecthyma gangrenosum (Pseudomonas in immunocompromised)

Key distinction: Pyoderma gangrenosum vs infected PI — PG worsens with debridement (pathergy), associated with IBD/RA, responds to immunosuppression. Surgical debridement of misdiagnosed PG can be catastrophic.

Step 3 management: Any "non-healing pressure ulcer" not in a typical pressure location → consider biopsy and broader differential before continuing pressure-injury-focused care.

Arterial (ischemic) ulcers:

Venous stasis ulcers:

Diabetic neuropathic (Wagner) ulcers:

Pyoderma gangrenosum:

Malignancy:

Vasculitis ulcers:

Infectious:

Secondary Prevention, Discharge Planning, and Long-Term Care

— Wound documented with photo, stage, measurements

— Detailed dressing change instructions (frequency, supplies, technique) — provided in writing and teach-back verified

— Durable medical equipment ordered: pressure-redistributing mattress, wheelchair cushion, heel offloaders, lift devices as needed

— Home health nursing referral for wound care, skin assessments, and caregiver coaching

— Outpatient wound clinic appointment within 1–2 weeks

— PCP follow-up within 1 week

— Medication reconciliation: pain regimen, any antibiotics with stop date

— Daily skin inspection technique (use mirror, good lighting)

— Repositioning every 2 hours; weight shifts every 15–30 min if wheelchair-bound

— Recognition of early PI signs (non-blanchable redness, warmth, new pain)

— When to call: increased drainage, odor, fever, expanding redness

— Continued protein supplementation if active wound; goal 1.25–1.5 g/kg/d

— Hydration goals; address any modifiable deficiencies

— Smoking cessation (nicotine vasoconstricts; smoking doubles non-healing risk)

— Glycemic control (HbA1c <7–8%)

— Bowel/bladder program for incontinence

— Mental health support for chronic wound patients

— Medicare covers wound care supplies through DME; documentation must justify medical necessity

— Some pressure-redistributing surfaces require prior authorization

— Home health under Medicare requires "homebound" status documentation

Step 3 management: Discharge of a stroke patient with healing Stage 3 sacral PI requires: home health wound care, DME (low-air-loss mattress, hospital bed), nutrition follow-up, PT/OT, PCP visit in 1 week, wound clinic in 2 weeks, and caregiver teach-back documented.

Board pearl: 30-day readmission for PI-related complications is a tracked CMS metric. Robust discharge planning is both a quality and reimbursement issue.

Discharge readiness checklist for any patient with PI or high PI risk:

Caregiver education (teach-back required):

Nutritional plan:

Behavioral and lifestyle:

Insurance/systems coordination:

Follow-Up, Monitoring Parameters, and Rehabilitation

— Stage 2: heals in 1–6 weeks with optimal care

— Stage 3: 1–4 months

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

— PUSH tool (Pressure Ulcer Scale for Healing): standardized tracking of size, exudate, tissue type; trend over weeks

— Expect ~20–40% reduction in wound area by week 4 — if not, reassess (osteomyelitis, ischemia, nutrition, ongoing pressure)

— Wound measurements (L × W × D), photo if institutional protocol

— Periwound skin, exudate, odor, tissue type

— Pain score

— Nutritional intake, weight trend

— Adherence to offloading and turning

— Caregiver burnout assessment

— CBC, CRP/ESR every 2–4 weeks during antibiotic therapy

— Albumin/prealbumin if nutritional concern

— Vancomycin troughs or AUC if applicable

— PT/OT for mobility, transfers, contracture prevention

— Wheelchair re-fitting and pressure mapping for SCI

— Seating clinic for tilt-in-space wheelchairs in high-risk patients

— PI history is the strongest predictor of recurrence

— Lifelong skin checks, pressure-redistribution, and behavioral reinforcement

— Annual review of equipment, weight changes, functional status

— Worsening wound after 2 weeks of optimal therapy

— New systemic symptoms (fever, malaise)

— Caregiver inability to continue care

CCS pearl: At each outpatient follow-up, advance the clock 1–2 weeks and reorder: wound measurements, photo, dressing change, Braden, nutrition reassessment. Document the trajectory — Step 3 rewards longitudinal thinking.

Key distinction: Lack of progress at 2 weeks is the trigger for reassessment, not 6 weeks — early intervention prevents chronicity.

Wound healing trajectory expectations:

Monitoring parameters at each visit:

Laboratory monitoring (for Stage 3/4 or osteomyelitis):

Rehabilitation:

Recurrence prevention:

When to re-escalate:

Ethical, Legal, and Patient Safety Considerations

— Stage 3, Stage 4, and unstageable PIs developing in-hospital are non-reimbursable

— Present-on-admission (POA) indicator must be coded within 24 hours; missing this costs the hospital reimbursement and the patient appropriate documentation

— Encourages thorough admission skin exams — both ethically right and financially aligned

— Date/time/location of skin exam, photo with ruler, stage, measurements

— Each shift's turning record (electronic position-monitoring increasingly used)

— Refusals: if a patient declines turning, document refusal, education provided, alternatives offered

— Failure to document = failure to perform, in court

— Debridement (sharp/surgical), NPWT initiation, flap reconstruction all require consent including risks of bleeding, infection, failure, and need for further surgery

— Photography requires patient consent per HIPAA and institutional policy

— Kennedy terminal ulcers and skin failure in dying patients are expected, not negligence

— Aggressive Q2H turning may cause distress in actively dying patients — comfort-focused repositioning is appropriate after goals-of-care discussion

— Document the shift from prevention-focused to comfort-focused care

— Stage 3/4 PI in an elderly or disabled person at home or in LTC may trigger adult protective services investigation for neglect — physicians are mandated reporters in most states

— Pediatric Stage 3/4 PI without medical explanation → child protective services notification

— PIs worsen most often during transitions (ED → floor, OR → PACU, hospital → SNF)

— Standardized handoff including skin assessment is a Joint Commission expectation

— Receiving facility should perform independent skin exam within 24 hours

— Dark-skinned patients are diagnosed at higher stages because Stage 1 erythema is missed — institutions must train staff in inspection beyond visible erythema (palpation, temperature, induration)

Step 3 management: A nursing home resident is admitted with an unstaged sacral wound. The correct sequence is: examine and stage on admission, document as POA, photograph, report to APS if neglect suspected, contact family, and initiate prevention bundle plus wound care. Failure to report when neglect is suspected is itself a legal exposure.

CMS "never event" framing:

Documentation as medicolegal protection:

Informed consent for procedures:

End-of-life ethical considerations:

Mandatory reporting:

Transitions of care risk:

Health equity:

High-Yield Associations and Rapid-Fire Clinical Facts

Board pearl: When a vignette mentions a patient "found down" for hours, expect deep tissue pressure injury to evolve over 24–72 hours — counsel and document POA early.

Most common PI site overall: sacrum/coccyx (~30%), followed by heels (~25%)

Most common device-related site: nasal bridge (BiPAP) and ear (oxygen tubing/ETT ties)

Tissue damage begins after as little as 2 hours of unrelieved pressure

Capillary closing pressure: ~32 mmHg — surface interface pressures above this impair perfusion

Braden cutoff for "at risk": ≤18 in general, ≤12 high risk

Turning interval standard: every 2 hours in bed, weight shifts every 15–30 min in chair

30-degree lateral tilt preferred over 90° (avoids trochanter direct pressure)

Heel float = single highest-yield intervention for heel PI prevention

Head of bed ≤30° balances aspiration prevention with shear reduction

Protein goal for at-risk or healing patient: 1.25–1.5 g/kg/day

Arginine + zinc + antioxidant supplementation has RCT support for Stage 2+ healing

Do not debride dry, stable heel eschar in ischemic feet

Probe-to-bone test: sensitive for osteomyelitis; MRI to confirm; biopsy is gold standard

Wound culture: deep tissue biopsy >> surface swab

Kennedy terminal ulcer: pear-shaped sacral wound in dying patient; expected skin failure

Pyoderma gangrenosum shows pathergy — worsens with debridement; associated with IBD, RA

Marjolin ulcer = SCC in chronic wound; biopsy any chronic non-healing wound with atypical features

Calciphylaxis in ESRD: painful violaceous plaques → black eschar; sodium thiosulfate treatment

CMS never events: hospital-acquired Stage 3, 4, and unstageable PIs (not DTPI or Stage 1/2)

Autonomic dysreflexia in SCI ≥T6: occult PI may be the trigger — sudden HTN, headache, sweating

Most common malpractice claim in nursing homes: pressure injury

Top three modifiable risk factors: immobility, moisture, malnutrition

Smoking doubles non-healing risk

Reverse-staging is incorrect: a Stage 4 that fills with granulation is a "healing Stage 4"

MASD ≠ PI: irregular borders, not over bone, moisture-driven — treat with barrier, not offloading

Prevention bundle (SSKIN) reduces HAPI by 50–70%

Air-fluidized beds reserved for post-flap or large trunk Stage 3/4

Board Question Stem Patterns

— 78-year-old with stroke and right hemiparesis admitted; Braden 12. Best next step?

— Answer: Initiate prevention bundle — pressure-redistributing mattress, Q2H turning with 30° lateral tilt, heel float, barrier cream, nutrition consult, daily skin assessment. Not "wait and see" or "consult wound care only."

— Photo or description of sacral wound with intact skin, persistent purple discoloration, boggy feel.

— Answer: Deep tissue pressure injury (DTPI) — document as such, photograph, offload, expect potential evolution.

— Stage 4 wound now with granulation tissue and depth 0.5 cm. How to document?

— Answer: Healing Stage 4 pressure injury, not Stage 2.

— Dry, stable black heel eschar in diabetic with absent pedal pulses. Next step?

— Answer: Do not debride. Paint with povidone-iodine, offload, order ABI/vascular consult.

— Stage 3 sacral wound with mixed flora on swab, no surrounding erythema, afebrile.

— Answer: No antibiotics — colonization, not infection. Continue local wound care.

— Stage 4 sacral wound, probe to bone, non-healing 8 weeks. Best test?

— Answer: MRI with contrast, then bone biopsy for culture-directed therapy.

— Painful rapidly enlarging ulcer with violaceous undermined borders, IBD history. Treatment?

— Answer: Systemic steroids/immunosuppression, not debridement (pathergy).

— Patient admitted with Stage 3 sacral wound documented on admission, then worsens to Stage 4 day 5.

— Answer: Original wound POA; worsening is not a hospital-acquired never event if documented properly, though quality review still occurs.

— Hospice patient with Kennedy terminal ulcer, family upset.

— Answer: Explain skin failure as part of dying process, shift to comfort, document GOC discussion.

— Patient transferred from SNF with new Stage 4 wound not documented at SNF.

— Answer: Document POA, examine and stage, photograph, consider APS report for suspected neglect, initiate care.

Step 3 management: Recognize when the answer is a system intervention (bundle, protocol, consult) rather than a single drug or procedure — this is the Step 3 signature.

Pattern 1 — The admission bundle question:

Pattern 2 — Stage identification:

Pattern 3 — Reverse staging trap:

Pattern 4 — Eschar management:

Pattern 5 — Infection vs colonization:

Pattern 6 — Osteomyelitis workup:

Pattern 7 — Pyoderma gangrenosum trap:

Pattern 8 — Never event coding:

Pattern 9 — Ethics/end of life:

Pattern 10 — Systems/transition:

One-Line Recap

Pressure injury prevention is a multidisciplinary, bundle-based systems intervention — risk assessment, surface, skin inspection, repositioning, moisture management, and nutrition — that, when reliably executed at every transition of care, prevents the majority of hospital-acquired pressure injuries and their downstream sepsis, surgical, legal, and reimbursement consequences.

— Bundle beats any single intervention: SSKIN (Surface, Skin inspection, Keep moving, Incontinence/moisture, Nutrition) reduces HAPI by 50–70%; no single component substitutes for the whole. Order it as a set on admission for any Braden ≤18.

— Stage correctly, never reverse-stage: Stage 1 = non-blanchable intact skin; Stage 2 = partial-thickness, no slough; Stage 3 = full-thickness, fat visible; Stage 4 = bone/tendon/muscle; DTPI = persistent deep discoloration; unstageable = obscured by eschar/slough. A healed Stage 4 is a "healing Stage 4," not a Stage 2.

— Treat infection, not colonization; image when bone is suspected: Polymicrobial cultures alone don't warrant antibiotics. Probe-to-bone, non-healing, or systemic signs → MRI with contrast and bone biopsy for osteomyelitis. Do not debride dry stable heel eschar in ischemic feet; get ABI/vascular first.

— Systems, documentation, and transitions are the Step 3 layer: Document POA within 24 hours, photograph, perform teach-back with caregivers, coordinate home health/DME/wound clinic, report suspected neglect, and recognize Kennedy terminal ulcer as expected skin failure — not a quality failure — in dying patients.

Board pearl: Whenever a Step 3 vignette involves a high-risk immobile patient, the highest-yield answer is almost always the proactive bundle ordered before the wound develops — prevention is the test's preferred intervention.

Top 4 high-yield recap bullets: