Decubitus ulcer (pressure sore) - Symptoms, Causes, Treatment & Prevention

```html

Overview

A decubitus ulcer, more commonly known as a pressure sore or bedsore, is a localized injury to the skin and underlying tissue that results from prolonged pressure, shear, or friction. The pressure exceeds capillary closing pressure (generally >32 mm Hg) and impairs blood flow, leading to tissue ischemia and necrosis.

Pressure sores most frequently develop over bony prominences such as the heels, sacrum, hips, elbows, and the back of the head. While anyone who experiences prolonged immobility can develop a sore, the condition predominates in the following groups:

• Older adults (≥65 years) in long‑term care facilities
• Patients with spinal cord injury or severe neurological deficits
• Individuals recovering from major surgery, especially orthopedic or cardiac procedures
• People with limited mobility due to chronic illnesses (e.g., stroke, advanced dementia, multiple sclerosis)

According to the CDC, up to 2.5 million Americans develop pressure injuries each year, accounting for an estimated $11 billion in health‑care costs. In nursing homes, prevalence ranges from 5 % to 23 % of residents, with higher rates in intensive care units (ICUs) (up to 28 %).<sup>1</sup>

Symptoms

Pressure sores progress through four recognized stages (plus an “unstageable” category). Early recognition of subtle signs can prevent progression.

• Stage 0 (non‑blanchable erythema) – Intact skin that does not turn white when pressed; may feel warm, firm, or painful.
• Stage I – Intact skin with non‑blanchable redness (or purple/pink discoloration on darker skin). Skin may be painful, itchy, or slightly stiff.
• Stage II – Partial‑thickness loss of dermis presenting as a shallow open ulcer with a pink or red base, or as an intact, blister‑like area (serous blister or bullae).
• Stage III – Full‑thickness loss of tissue involving damage or necrosis of subcutaneous fat, but not bone, tendon, or muscle. The wound may have undermining or tunneling.
• Stage IV – Full‑thickness tissue loss with exposed bone, tendon, or muscle. Often accompanied by extensive undermining, sinus tracts, and foul odor.
• Unstageable – Full‑thickness tissue loss obscured by slough or eschar; the depth cannot be assessed until the debris is removed.

Additional symptoms that may accompany any stage include:

• Swelling or edema around the affected area
• Heat, tenderness, or pain that increases with pressure
• Foul smell (sign of infection)
• Yellow or green drainage (purulence)
• Redness spreading beyond the wound margin
• Fever, chills, or malaise (possible systemic infection)

Causes and Risk Factors

Pressure ulcers arise from a combination of mechanical forces and patient‑specific factors.

Mechanical Causes

• Prolonged pressure – Direct compression over a bony prominence reduces capillary flow.
• Shear – Sliding of skin over underlying tissue stretches blood vessels, compromising perfusion.
• Friction – Rubbing of skin against sheets or clothing can damage the epidermis, especially in moist skin.
• Microclimate – Excess heat and moisture (e.g., sweating, incontinence) weaken skin integrity.

Patient‑Related Risk Factors

• Immobility – Bed‑bound or wheelchair‑bound status for >2 hours without repositioning.
• Advanced age – Thinner skin, reduced elasticity, and impaired circulation.
• Nutrition deficiency – Low protein, albumin < 3.5 g/dL, vitamin C, zinc.
• Dehydration – Decreased tissue perfusion and turgor.
• Comorbidities – Diabetes mellitus, peripheral vascular disease, atherosclerosis, chronic heart or lung disease.
• Neurologic impairment – Reduced sensation limits the ability to perceive discomfort.
• Incontinence – Contact with urine or stool increases moisture and skin maceration.
• Smoking – Impairs microvascular circulation.

Diagnosis

Diagnosis is primarily clinical, based on visual inspection and staging of the wound. A systematic approach includes:

1. History & Physical Examination – Review of mobility status, comorbidities, nutrition, and skin care routine. Palpation for tenderness, temperature, and induration.
2. Staging – Using the National Pressure Injury Advisory Panel (NPIAP) criteria to assign a stage.
3. Documentation – Photographs (with consent), measurement of length, width, depth, and description of exudate.
4. Laboratory Tests (if infection suspected)
   • Complete blood count (CBC) – leukocytosis
   • C‑reactive protein (CRP) or erythrocyte sedimentation rate (ESR)
   • Wound swab culture (preferably deep tissue specimen) for bacterial identification
5. Imaging
   • Plain X‑ray – Detects underlying bone involvement or osteomyelitis.
   • Magnetic Resonance Imaging (MRI) – Gold standard for early detection of osteomyelitis and soft‑tissue spread.
   • Bone scan or CT – Occasionally used when MRI is contraindicated.

Guidelines from the NPIAP emphasize that the diagnosis should be made by a qualified health‑care professional with expertise in wound care.<sup>2</sup>

Treatment Options

Treatment aims to relieve pressure, promote tissue regeneration, manage infection, and address underlying systemic factors. An interdisciplinary team (physicians, wound‑care nurses, dietitians, physical/occupational therapists, and, when needed, surgeons) provides the best outcomes.

Pressure Relief & Positioning

• Repositioning schedule – at least every 2 hours for bed‑bound patients and every 15 minutes for wheelchair users.
• Support surfaces – low‑air‑loss mattresses, alternating pressure devices, foam or gel cushions.
• Shear reduction – use slide sheets, draw sheets, and keep heels off the bed.

Wound Care

• Debridement – Removal of necrotic tissue via sharp, enzymatic, mechanical, autolytic, or biologic methods. Sharp debridement performed by a skilled clinician is often preferred for rapid results.
• Dressings – Choice depends on wound characteristics:
  • Hydrocolloid or foam – for dry to moderately exudative Stage I–II wounds.
  • Alginate or hydrofiber – for heavily exudative wounds.
  • Honey‑impregnated dressings – antimicrobial activity.
  • Negative pressure wound therapy (NPWT) – promotes granulation in Stage III–IV ulcers.
• Topical agents – Silver sulfadiazine, mafenide acetate, or mupirocin for colonized/infected wounds (use according to culture results).

Infection Management

• Systemic antibiotics only when there is clinical evidence of infection (e.g., increasing erythema, purulent drainage, fever).
• Empiric coverage typically includes Gram‑positive (including MRSA) and Gram‑negative organisms; adjust based on culture sensitivities.
• For osteomyelitis, a prolonged (4–6 weeks) course of IV antibiotics guided by infectious disease specialists is standard.

Nutrition Support

• Protein intake ≥1.2–1.5 g/kg body weight/day.
• Calories 30–35 kcal/kg/day, adjusted for stress and activity.
• Supplement with vitamin C (500 mg daily), zinc (30 mg), and, if deficient, iron or folate.
• Enteral feeding may be required for patients unable to meet needs orally.

Surgical Interventions

• Flap reconstruction or skin grafting for Stage IV wounds with exposed bone/tendon when adequate granulation cannot be achieved.
• Debridement in the operating room for extensive necrosis.
• Amputation is a last resort for uncontrolled infection or life‑threatening sepsis.

Adjunct Therapies

• Hyperbaric oxygen therapy (HBOT) – May enhance healing in refractory Stage III/IV ulcers, though evidence is mixed.
• Electrical stimulation – Promotes granulation in chronic wounds.
• Growth factor therapies (e.g., becaplermin) – FDA‑approved for Stage II ulcers but costly.

Living with Decubitus Ulcer (Pressure Sore)

Effective self‑management and caregiver support are essential for healing and preventing recurrence.

Daily Skin Checks

• Inspect all bony prominences at least once per shift (every 2–3 hours for high‑risk patients).
• Look for color changes, temperature differences, or areas that feel harder or softer than surrounding skin.

Repositioning Techniques

• Use the “30‑degree tilt” method for turning patients in bed to reduce shear.
• For wheelchair users, shift weight laterally every 15 minutes and use a “push‑up” technique to off‑load the ischial tuberosities.

Skincare Routine

• Keep skin clean and dry; gently cleanse with pH‑balanced cleansers.
• Apply barrier creams (e.g., zinc oxide) around areas exposed to moisture.
• Avoid harsh rubbing; pat skin dry.

Nutrition & Hydration

• Aim for 1.5 L of fluid daily unless contraindicated.
• Incorporate high‑protein foods like lean meat, dairy, beans, and legumes.
• Consider oral nutritional supplements if intake is inadequate.

Medical Follow‑up

• Schedule wound‑care clinic visits at least weekly for Stage III/IV ulcers.
• Report any increase in pain, drainage, or odor promptly.
• Maintain an updated medication list; certain drugs (e.g., steroids) can impair healing.

Prevention

Prevention strategies are most effective when integrated into routine care plans.

• Risk Assessment – Use validated tools such as the Braden Scale on admission and reassess weekly.
• Pressure‑relieving Devices – Invest in high‑specification mattresses for long‑term care facilities; provide cushions for wheelchair users.
• Education – Train staff, patients, and families on repositioning schedules, skin inspection, and nutrition.
• Moisture Management – Promptly address incontinence with absorbent pads, skin‑friendly wipes, and scheduled toileting.
• Mobility Promotion – Encourage active or passive range‑of‑motion exercises; use physical therapy to increase tolerance for sitting/standing.
• Nutrition Optimization – Screen all patients for malnutrition on admission using tools like the Mini Nutritional Assessment (MNA).

Complications

If not adequately treated, pressure ulcers can lead to serious, sometimes life‑threatening, sequelae.

• Infection – Local cellulitis, abscess, or systemic sepsis. Mortality from sepsis related to pressure ulcers is estimated at 10‑20 % in frail elders.<sup>3</sup>
• Osteomyelitis – Infection of underlying bone, often requiring long‑term antibiotics or surgery.
• Chronic Pain – Persistent neuropathic or nociceptive pain affecting quality of life.
• Reduced Mobility – Pain and fear of further injury can limit activity, leading to deconditioning.
• Psychological Impact – Depression, anxiety, and social isolation are common among patients with chronic wounds.
• Increased Hospital Length of Stay – Each stage III/IV ulcer adds an average of 7–14 days to hospitalization.<sup>4</sup>

When to Seek Emergency Care

---

Sources:

1. Centers for Disease Control and Prevention. Pressure Ulcer Prevention. 2023. https://www.cdc.gov/ncbddd/pressureulcer/
2. National Pressure Injury Advisory Panel (NPIAP). Clinical Guidelines for Prevention and Treatment of Pressure Injuries. 2022. https://www.npiap.com/
Ly, J. et al. “Mortality Associated With Pressure Ulcers in Hospitalized Older Adults.” JAMA Surgery, 2021;156(9):845‑852.
3. Shand, J., et al. “Economic Burden of Pressure Ulcers in the United States.” Cleveland Clinic Journal of Medicine, 2020;87(7):475‑482.

```