A 43-year-old window cleaner fell off a scaffold. He sustained an open wound on the right leg. Debridement was carried out in the emergency department, and the edges of the wound were left open.Which factor is least likely to inhibit wound contraction?
## Core Concept
Wound contraction is a crucial process in wound healing, where the area of the wound decreases due to the centripetal movement of the surrounding skin. This process is primarily facilitated by myofibroblasts, which are specialized fibroblasts with contractile properties. Various factors can influence wound contraction, including nutritional status, infection, and the presence of certain cells or substances.
## Why the Correct Answer is Right
The correct answer, **D. Vitamin C**, is a factor that actually supports wound healing, including wound contraction, rather than inhibiting it. Vitamin C is crucial for the synthesis of collagen, a key component of the extracellular matrix, and it also enhances the function of fibroblasts and myofibroblasts, which are essential for wound contraction.
## Why Each Wrong Option is Incorrect
- **Option A:** Infection is known to significantly inhibit wound contraction. The presence of bacteria can lead to inflammation, tissue damage, and the destruction of newly formed tissue, all of which impede the wound healing process, including contraction.
- **Option B:** Excessive wound tension can physically impede the process of wound contraction. When the edges of a wound are under tension, it can be more difficult for the myofibroblasts to contract and bring the edges closer together.
- **Option C:** Malnutrition generally impairs wound healing, including wound contraction. Nutrients are essential for energy, synthesis of new tissue, and the function of cells involved in healing.
## Clinical Pearl / High-Yield Fact
A key point to remember is that for optimal wound healing and contraction, maintaining a clean and moist environment, ensuring adequate nutrition (particularly proteins and vitamins like Vitamin C), and minimizing infection and tension on the wound are crucial.
## Correct Answer: D. Vitamin C