Nail Assessment and Pressure Injury Management

Color and Perfusion

The pink color of a healthy nail comes from the vascular nail bed underneath. Clinicians must be vigilant for changes in color:

• Cyanosis: A bluish tint to the nail beds, which may indicate hypoxemia or poor perfusion.
• Pallor: A pale appearance that may signal anemia or arterial insufficiency.

To assess peripheral circulation, clinicians use the capillary refill test. By depressing the nail edge to blanch it and then releasing, you can observe how quickly color returns. A normal return occurs within $1–2$ seconds. A delayed refill is a clinical indicator of poor peripheral perfusion.

Exam Tip: When assessing color changes in patients with darker skin tones, look for changes in areas where pigment is least concentrated, such as the nail beds, oral mucosa, and conjunctivae.

Pressure Injury Management

Pressure injuries are localized damages to the skin or underlying tissue, typically occurring over bony prominences. They are caused by prolonged pressure that impedes arterial flow and venous drainage, leading to ischemia (lack of oxygen to the tissue) and subsequent cell death.

Risk Factors and Common Sites

Identifying at-risk patients is essential for prevention. Common risk factors include:

• Impaired mobility: The inability to change positions independently.
• Skin integrity: Thin, fragile skin, which is especially common in older adults.
• Sensory perception: Decreased ability to feel pain or pressure.
• Moisture: Incontinence, sweat, or wound drainage.
• Mechanical forces: Shearing forces and friction.
• Systemic factors: Poor nutrition and infection.

Common sites for injury depend on the patient's position. For a patient lying on their back, common sites include the occiput, scapula, vertebrae, sacrum, ischium, and heels. For a patient lying on their side, the ear, shoulder, hip, knee, and ankle are high-risk areas.

Quantifying Risk: The Braden Scale

To standardize risk assessment, clinicians use the Braden Scale. It is important to remember that on this scale, a lower score indicates a higher risk of developing a pressure injury.

| 13