A 58-year-old diabetic man underwent abdominal surgery 10 days ago. On postoperative day 10, he presents with wound dehiscence (partial separation of sutures) with serosanguineous drainage. The wound shows no signs of frank infection or abscess. His blood glucose has been poorly controlled (fasting glucose 280 mg/dL). What is the most appropriate next step in management?

Explanation

## Postoperative Wound Dehiscence: Management Strategy ### Pathophysiology of Dehiscence **Key Point:** Wound dehiscence on postoperative day 10 indicates failure of the **proliferative phase** of wound healing. At this stage, tensile strength is still <5% of normal skin, making the wound vulnerable to mechanical stress and metabolic insults. **High-Yield:** Risk factors for dehiscence include: - **Diabetes mellitus** (impaired collagen synthesis, angiogenesis, immune function) - **Poor glycemic control** (hyperglycemia inhibits fibroblast function and increases infection risk) - **Malnutrition** - **Infection** - **Excessive tension on closure** - **Coughing, straining** (increased intra-abdominal pressure) ### Mechanism of Hyperglycemia-Induced Impaired Healing 1. **Reduced angiogenesis** → decreased oxygen delivery 2. **Impaired fibroblast proliferation** → reduced collagen deposition 3. **Increased glycation of collagen** → abnormal cross-linking 4. **Neutrophil dysfunction** → increased infection susceptibility 5. **Reduced growth factor signaling** (TGF-β, VEGF) ### Optimal Management Sequence | Priority | Action | Rationale | |----------|--------|----------| | **1** | Aggressive glycemic control | Address the root metabolic cause; tight glucose control (target 140–180 mg/dL) restores fibroblast function | | **2** | Wound assessment & irrigation | Remove debris, assess for infection/necrosis | | **3** | Debridement of necrotic tissue | Eliminate non-viable tissue that impairs healing | | **4** | Decide closure strategy | Delayed primary closure (if clean) or secondary intention (if contaminated) | | **5** | Supportive care (nutrition, NPWT if indicated) | Optimize healing environment | **Clinical Pearl:** On postoperative day 10, immediate re-closure under general anesthesia is **not** the first step. The wound must be assessed for infection and the metabolic milieu corrected first. Re-closure without addressing hyperglycemia will likely fail again. ### Healing by Secondary Intention **Mnemonic: SCAR** — Secondary intention healing is appropriate when: - **Sepsis/contamination** present - **Cannot achieve tension-free closure** - **Anatomic constraints** prevent primary closure - **Revascularization needed** before closure In this case, if debridement reveals significant necrosis or contamination, secondary intention with NPWT and strict glycemic control is preferable to premature re-closure. **Warning:** ~~Immediate re-closure~~ without addressing the hyperglycemia and assessing for infection is a common trap. The wound environment is hostile; metabolic optimization must precede any definitive closure.