A 52-year-old male farmer from rural Maharashtra undergoes elective open cholecystectomy for symptomatic cholelithiasis. On postoperative day 5, the surgical wound shows erythema, warmth, and purulent discharge. Culture grows Staphylococcus aureus. The patient's haemoglobin is 9.2 g/dL (preoperative: 13.8 g/dL), serum albumin 2.8 g/dL, and blood glucose (random) 280 mg/dL. Which of the following is the MOST significant modifiable risk factor contributing to impaired wound healing in this patient?

Explanation

## Wound Healing Phases and Risk Factors ### Clinical Context This patient presents with a surgical site infection (SSI) on postoperative day 5, during the **inflammatory phase** of wound healing (days 0–5). Multiple risk factors are present, but the question asks for the MOST SIGNIFICANT MODIFIABLE factor. ### Analysis of Risk Factors | Risk Factor | Mechanism | Modifiability | Impact on Healing | |---|---|---|---| | **Hyperglycaemia** | Impairs neutrophil function, collagen synthesis, angiogenesis; increases infection risk | **Highly modifiable** (insulin, glycaemic control) | Severe — directly impairs all phases | | Hypoproteinaemia | Reduces collagen deposition, immune response | Modifiable (nutritional support) | Moderate — affects fibroplasia phase | | Anaemia | Reduces oxygen delivery to wound | Modifiable (transfusion, iron) | Moderate — affects fibroblasts and angiogenesis | | Bacterial colonization | Infection triggers excessive inflammation | Partially modifiable (antibiotics, debridement) | Severe but consequence, not primary cause | ### Key Point: **Hyperglycaemia is the MOST SIGNIFICANT MODIFIABLE risk factor** because: 1. Blood glucose 280 mg/dL is severely elevated and directly impairs wound healing at multiple steps 2. It is **immediately correctable** with insulin and glycaemic management 3. Hyperglycaemia impairs neutrophil chemotaxis and phagocytosis, reducing infection resistance 4. It inhibits collagen cross-linking and angiogenesis 5. The SSI itself may be a consequence of poor glycaemic control ### High-Yield: **Optimal perioperative glycaemic control (target 140–180 mg/dL) reduces SSI rates by 30–50%** in surgical patients, making it a critical modifiable factor. ### Clinical Pearl: While anaemia and hypoproteinaemia are present, they develop over time and are less immediately correctable than hyperglycaemia. Bacterial colonization is a consequence of impaired immune function, not a primary risk factor. ### Mnemonic: **CHOP-S** — Factors impairing wound healing: - **C**orticosteroids - **H**yperglycaemia ← Most modifiable in acute setting - **O**besity - **P**oor perfusion / Protein malnutrition - **S**moking [cite:Sabiston Textbook of Surgery Ch 6]