How does edema influence wound healing?

• A. Excess edema can impede oxygen diffusion and nutrient delivery, delaying healing.
• B. Edema accelerates wound healing by increasing perfusion.
• C. Edema has no effect on healing.
• D. Edema only affects pain but not healing.

Answer: (A)

Edema slows wound healing because the extra fluid in the tissue increases the distance oxygen and nutrients must diffuse from blood vessels to the wound cells. This reduces oxygen tension at the wound site, limiting energy production needed for fibroblast activity, collagen synthesis, and other repair processes. The swelling also raises interstitial pressure, which can compress capillaries and further cut blood flow, worsening hypoxia. Additionally, excess fluid can dilute growth factors and immune mediators in the wound environment and impair immune cell function, delaying debris clearance and infection control. While some edema is part of the normal inflammatory response, excessive edema creates a hostile environment for healing and tends to delay it.