2.1 Bathing, Skin Care, and Pressure Injury Prevention

Hygiene Fundamentals & Bathing Modalities

Personal hygiene is a cornerstone of basic nursing care that maintains skin integrity, promotes circulation, prevents infection, and supports resident dignity. The certified nursing assistant (CNA) delivers bathing assistance tailored to the resident's care plan, physical mobility, and personal preferences. Bathing modalities range from complete bed baths for immobile residents to partial bed baths, tub baths, and therapeutic showers.

Bathing Modalities Overview

Water Temperature Safety Protocols

Water temperature regulation is critical to prevent thermal burns, particularly in geriatric residents whose skin is thin, fragile, and less sensitive to thermal changes due to peripheral neuropathy or diminished sensation.

• Required Temperature Range: Water temperature for bed baths, tub baths, and showers must be maintained strictly between 105°F and 110°F (40.5°C to 43.3°C).
• Verification Procedure: Prior to touching the resident's skin, the CNA must test the water temperature using a calibrated bath thermometer. Secondary manual verification involves testing the water on the inner wrist or elbow.
• Resident Comfort: Always invite the resident to feel the water on their hand to verify personal preference before beginning the bath.

Systematic Washing Sequence (Cleanest to Dirtiest)

To prevent cross-contamination and the spread of transient microorganisms, bathing must follow a strict cleanest-to-dirtiest order:

1. Eyes: Wash with plain warm water (no soap). Wipe from the inner canthus to the outer canthus, using a clean, unused section of the washcloth for each eye stroke.
2. Face, Ears, and Neck: Wash, rinse, and dry thoroughly without harsh rubbing.
3. Arms, Hands, and Axillae: Wash distal to proximal (wrist to shoulder) to promote venous blood return.
4. Chest and Abdomen: Pay special attention to clean and dry beneath inframammary skin folds.
5. Legs and Feet: Wash from ankle to thigh; clean between toes and dry thoroughly to prevent fungal growth.
6. Back and Sacrum: Perform back massage using long, smooth strokes (effleurage) to enhance circulation.
7. Perineal Area: Performed last as the dirtiest area using fresh water, soap, and clean washcloths.

Skin Anatomy, Etiology of Breakdown, and the Braden Scale

The skin (integumentary system) serves as the body's primary barrier against pathogens, physical injury, and chemical irritation. Elderly skin undergoes age-related changes including epidermal thinning, loss of subcutaneous fatty tissue, reduced collagen, and decreased sebum production, making it highly susceptible to breakdown.

Key Etiological Factors in Skin Breakdown

Skin breakdown occurs when localized cellular hypoxia and tissue ischemia develop due to prolonged mechanical forces. The primary contributing factors include:

• Pressure: Continuous compression of soft tissue between a hard surface (such as a mattress or wheelchair cushion) and a bony prominence (e.g., sacrum, heels, ischial tuberosities). Pressure exceeding capillary perfusion pressure (approx. 32 mmHg) obstructs blood flow, leading to tissue ischemia and cell death.
• Shear: Occurs when skin remains stationary against a surface while underlying bone and subcutaneous tissues slide down (e.g., when the head of the bed is elevated above 30 degrees and the resident slides down). Shear stretches and tears deep blood vessels.
• Friction: Mechanical force created when skin rubs repeatedly against bed linens or clothing, stripping the superficial epidermal layer.
• Moisture: Continuous exposure to urine, feces, sweat, or wound drainage causes maceration (softening and weakening of epidermal tissue), dramatically increasing breakdown vulnerability.

The Braden Scale for Predicting Pressure Sore Risk

The Braden Scale is a validated clinical risk assessment tool utilized by the healthcare team. CNAs contribute subjective observations to assist nurses in scoring the 6 risk domains:

Clinical Interpretation: Total scores range from 6 to 23. A lower numerical score indicates a higher risk of pressure injury. A score of 18 or below indicates high risk requiring immediate preventative protocols.

Staging Pressure Injuries

A pressure injury is localized damage to the skin and underlying soft tissue, usually over a bony prominence. CNAs must recognize tissue changes early and immediately report them to the charge nurse. Pressure injuries are classified into standardized stages based on the depth of tissue loss.

Pressure Injury Classification Framework

• Stage 1 Pressure Injury (Non-Blanchable Erythema): Intact skin with a localized area of non-blanchable erythema (redness that does not turn white when pressed). In darkly pigmented skin, discoloration may appear persistent red, purple, or blue, with localized changes in skin temperature, tissue firmness, or pain.
• Stage 2 Pressure Injury (Partial-Thickness Skin Loss): Partial-thickness loss of skin with exposed dermis. The wound bed is viable, pink or red, and moist. It may present as an intact or ruptured serum-filled blister. Subcutaneous fat and deeper tissues are not visible.
• Stage 3 Pressure Injury (Full-Thickness Skin Loss): Full-thickness loss of skin in which subcutaneous fat is visible in the ulcer. Granulation tissue and rolled wound edges (epibole) are often present. Slough or eschar may be visible, but depth is clear. Fascia, muscle, tendon, ligament, cartilage, or bone are not exposed.
• Stage 4 Pressure Injury (Full-Thickness Skin and Tissue Loss): Full-thickness skin and tissue loss with exposed or directly palpable fascia, muscle, tendon, ligament, cartilage, or bone in the ulcer bed. Slough and eschar may be present. Undermining and tunneling frequently occur.
• Unstageable Pressure Injury (Obscured Full-Thickness Skin and Tissue Loss): Full-thickness tissue loss in which the extent of tissue damage within the ulcer cannot be confirmed because it is completely covered by slough (yellow, tan, gray, green, or brown) or eschar (tan, brown, or black) in the wound bed.
• Deep Tissue Pressure Injury (DTPI): Intact or non-intact skin with localized area of persistent non-blanchable deep red, maroon, or purple discoloration, or epidermal separation revealing a dark wound bed or blood-filled blister.

Preventive Nursing Interventions & Positioning Protocols

Preventing pressure injuries requires a proactive, multi-faceted nursing care plan. CNAs execute primary preventative measures daily to safeguard resident tissue integrity.

Repositioning and Turning Schedules

• Bed-Bound Repositioning: Reposition bed-bound residents at least every 2 hours (Q2H) around the clock. Follow a written turning schedule (e.g., left side, back, right side).
• Chair-Bound Repositioning: Residents seated in wheelchairs or geriatric chairs must shift weight every 15 minutes if able, or be repositioned by staff at least every 1 hour.
• 30-Degree Lateral Position: When positioning on the side, tilt the resident to a 30-degree lateral angle using supportive foam wedges or pillows behind the back. Avoid a 90-degree lateral position, which places direct, unmitigated pressure on the greater trochanter of the femur.
• Elevation of Heels (Floating Heels): Elevate heels off the mattress surface completely by placing pillows underneath the calves. Ensure knees are slightly flexed to prevent popliteal vein compression.

Reducing Friction and Shear

• Use of Lift Sheets: Always use a draw sheet, friction-reducing slide sheet, or mechanical lift with two caregivers to move a resident up in bed. Never drag or pull a resident across bed sheets.
• Head of Bed Elevation: Keep the head of the bed elevated no higher than 30 degrees, except during meals and for 30–60 minutes post-feeding, to minimize shearing forces on the sacrum and coccyx.

Skin Hygiene and Protective Support Surfaces

• Incontinence Management: Clean skin immediately following any incontinent episode using a pH-balanced skin cleanser. Apply barrier ointments or creams (e.g., zinc oxide, petroleum-based barriers) to shield skin from moisture.
• Linens: Maintain bed linens clean, dry, and completely wrinkle-free. Remove crumbs or debris immediately.
• Support Surfaces: Ensure specialized pressure-reducing mattress overlays, gel wheelchair cushions, and elbow/heel protectors are in place according to the care plan.