The Four Phases of Wound Healing
Phase 1: Hemostasis (0-30 minutes)
- Immediate response to injury involving vasoconstriction and platelet aggregation to stop bleeding.
- Formation of fibrin clot creates temporary wound closure and framework for healing.
Key Points
- Occurs within minutes of injury
- Primary goal: Control bleeding
- Platelet plug formation is essential
Phase 2: Inflammatory Phase (1-6 days)
- Vasodilation and increased capillary permeability allow immune cells to enter wound site for debris removal.
- Classic signs include erythema, edema, heat, pain, and loss of function - these are normal and expected.
Critical Alert: Prolonged inflammation beyond 6 days may indicate infection or impaired healing
Key Points
- Neutrophils arrive first (24-48 hours)
- Macrophages clean debris and release growth factors
- Normal inflammatory signs should not be treated as infection
Phase 3: Proliferative Phase (4 days-3 weeks)
- Granulation tissue formation with new blood vessel growth (angiogenesis) and collagen synthesis.
- Epithelialization occurs as new skin cells migrate across wound surface to close the defect.
Memory Aid: "3 P's of Proliferation" - Proliferation of cells, Production of collagen, Pink granulation tissue
Key Points
- Granulation tissue appears red/pink and bumpy
- Wound contracts to reduce surface area
- Adequate nutrition essential for collagen synthesis
Phase 4: Maturation/Remodeling Phase (3 weeks-2 years)
- Collagen reorganization increases tensile strength, though healed tissue only reaches 80% of original strength.
- Scar tissue formation occurs as type III collagen is replaced by stronger type I collagen.
Key Points
- Longest phase of healing process
- Scar becomes less red and more flexible
- Final strength only 80% of original tissue
Commonly Confused Concepts
| Concept | Inflammatory Phase | Proliferative Phase |
|---|
| Timing | 1-6 days | 4 days-3 weeks |
| Key Process | Debris removal, immune response | Tissue building, granulation |
| Appearance | Red, swollen, warm | Pink granulation tissue |
| Main Cells | Neutrophils, macrophages | Fibroblasts, endothelial cells |
Clinical Scenario
Day 3 post-surgery: Patient has surgical incision with mild erythema, slight swelling, and tenderness. No purulent drainage present. Temperature 99.2°F.
Analysis: This represents normal inflammatory phase healing. The signs indicate appropriate immune response, not infection.
Nursing Interventions by Phase
- Hemostasis: Apply direct pressure, elevate if possible, assess for bleeding disorders
- Inflammatory: Protect from trauma, maintain moist environment, monitor for signs of infection
- Proliferative: Ensure adequate nutrition, protect granulation tissue, encourage mobility
- Maturation: Prevent contractures, protect from sun exposure, educate about scar management
NCLEX Memory Aid - "HIPS":
Hemostasis - Stop the bleeding
Inflammatory - Clean and protect
Proliferative - Build new tissue
Strengthening (Maturation) - Remodel and strengthen