Pressure Injury Prevention - Turning Nutrition and Moisture Management

Key Points

• Pressure plus shear is the central mechanism, so pressure redistribution is the foundation of prevention.
• Inspect high-risk skin and device contact points at admission and after clinical changes.
• Repositioning frequency should be individualized to mobility, support surface, tissue tolerance, and goals.
• Offload heels completely in high-risk bedbound patients.
• Moisture-associated dermatitis and pressure injury are different entities and can coexist.
• Nutrition supports tissue health but does not replace pressure relief.
• Avoid friction and shear during transfers by using lift techniques.
• Established wounds require staging, perfusion assessment, and cause-directed wound care.

Algorithm

1. Assess mobility, skin, perfusion, moisture, nutrition, cognition, and device-related pressure risk.
2. Inspect sacrum, heels, other bony prominences, and beneath devices.
3. Choose an appropriate pressure-redistributing mattress or cushion.
4. Create an individualized turning, offloading, and mobility plan.
5. Control moisture and minimize friction and shear.
6. Address inadequate protein, calorie, and fluid intake.
7. If injury develops, stage it, evaluate perfusion/infection, and select wound care accordingly.
8. Reassess prevention intensity after every meaningful change in mobility or illness.

Clinical Synopsis & Reasoning

Pressure injuries develop when sustained pressure or pressure combined with shear causes localized tissue ischemia and deformation, usually over bony prominences or beneath medical devices. Older adults are especially vulnerable because skin is thinner, subcutaneous tissue is reduced, mobility is often impaired, and comorbid vascular disease, malnutrition, incontinence, and sensory loss can reduce tissue tolerance. Risk assessment should occur on admission and whenever clinical status changes. A structured tool such as the Braden Scale can support assessment, but bedside findings and mobility trajectory matter more than the score alone.

Inspect the sacrum, heels, trochanters, elbows, occiput, ankles, and skin beneath oxygen tubing, masks, splints, cervical collars, and other devices. Nonblanchable erythema in intact skin is an early warning sign. Deep tissue injury may initially appear as persistent dark red, maroon, or purple discoloration and can evolve rapidly. In heavily pigmented skin, temperature, induration, tenderness, and color change compared with surrounding tissue may be more useful than blanching alone. Document location, dimensions, tissue appearance, drainage, surrounding skin, and pain rather than simply stating that a pressure sore is present.

Differentiate pressure injury from moisture-associated skin damage, venous disease, arterial ulcers, neuropathic ulcers, and skin tears because prevention and treatment differ. Incontinence-associated dermatitis tends to be diffuse and superficial in moisture-exposed areas rather than sharply localized over a bony prominence. Heel wounds require evaluation of perfusion before aggressive debridement; stable dry heel eschar without signs of infection may function as a biologic cover in selected ischemic patients.

Treatment Strategy & Disposition

Redistribute pressure with an appropriate support surface and individualized repositioning. Bedbound patients often need scheduled turning, but frequency should reflect the mattress, activity, perfusion, skin response, comfort, and goals of care. Use lift devices or draw sheets to minimize shear rather than dragging a patient across linens. Offload heels completely when risk is high by floating the heel or using a properly fitted device. Seated patients need pressure redistribution, posture optimization, and weight shifts when capable. Donut-shaped cushions can concentrate pressure and are generally avoided.

Manage moisture promptly. Cleanse gently after incontinence, use moisture barriers, and avoid prolonged wet linens or briefs. Treat diarrhea and urinary issues when possible without defaulting to indwelling catheters solely for convenience. Nutrition assessment should identify inadequate calorie, protein, fluid, and micronutrient intake; supplements are useful when deficiency or insufficient intake is present, but nutrition cannot overcome unrelieved pressure. Mobilize early and progressively when medically safe.

For an established injury, stage accurately, relieve pressure, control moisture, select dressings based on wound characteristics, and evaluate for infection or ischemia. Systemic antibiotics are not indicated for colonization alone but are used for cellulitis, sepsis, osteomyelitis, or another true infection. Debridement strategy depends on perfusion, tissue type, goals, and wound expertise. In advanced illness, comfort can appropriately take priority over aggressive turning or procedures when burdens exceed expected benefit. Prevention remains important, but the plan should respect pain, sleep, and patient goals.

Epidemiology / Risk Factors

• Risk rises with immobility, frailty, malnutrition, incontinence, poor perfusion, and critical illness.
• Heels and sacrum are common sites.
• Medical-device-related injuries are an important preventable subgroup.
• Pressure injuries increase length of stay, infection risk, pain, and care burden.

Investigations

High Risk Areas

Pharmacology

Prognosis / Complications

• Early erythema can resolve if pressure is relieved before deeper damage occurs.
• Advanced injuries may require prolonged wound care and can lead to osteomyelitis or sepsis.
• Healing is slower with ischemia, severe malnutrition, ongoing pressure, and uncontrolled systemic illness.
• Prevention is generally more effective and less burdensome than treatment of an established deep injury.

Patient Education / Counseling

• Teach caregivers how often to inspect skin and which areas are highest risk.
• Explain safe repositioning and heel offloading techniques.
• Keep skin clean and dry without excessive scrubbing.
• Report persistent redness, purple discoloration, blistering, drainage, odor, or increasing pain.
• Encourage mobility and adequate nutrition within the patient's medical limits.
• Discuss comfort-focused modifications when advanced illness changes the goals of care.

Notes

A turning schedule is a means, not the goal. The goal is sustained pressure relief without causing excessive pain, sleep disruption, or unsafe handling. Document the patient's response to the chosen support surface and repositioning interval and adjust when persistent erythema or tissue injury appears. Device checks should be included in every skin assessment because a well-protected sacrum does not prevent injury under an oxygen mask or splint.

References

1. National Pressure Injury Advisory Panel: Pressure Injury Prevention Resources — Link