SU5.1-4,SU6.1-2 | Wound Healing and Surgical Infection — Assignment

CLINICAL SCENARIO

A 52-year-old man who farms for a living is brought to the emergency department six hours after a deep, ragged wound to his right forearm sustained when he fell onto a rusty harrow in a muddy field. He has type 2 diabetes that is poorly controlled (HbA1c 9.8%), smokes 20 cigarettes a day, and cannot recall his last tetanus immunisation. On examination the wound has irregular edges with visible tissue bridges, is contaminated with soil and devitalised tissue, and is mildly malodorous. He is afebrile but the surrounding skin is erythematous. The injury occurred during an altercation with a neighbour, and the police have been informed.

1. Classify the wound

Classify this wound both morphologically and by its surgical contamination class, justifying each. Explain how these two classifications differ and what each tells you about management and infection risk.

Guidance: Identify it as a lacerated wound (blunt mechanism, ragged edges, tissue bridges) and as contaminated/dirty by class; link contamination class to SSI risk.

2. Why this wound is at high risk of impaired healing

Identify the local and systemic factors in this patient that will impair wound healing, and explain the mechanism by which each interferes with a specific phase of healing.

Guidance: Cover local factors (contamination, devitalised tissue, foreign material) and systemic factors (poorly controlled diabetes, smoking, possible malnutrition); relate each to haemostasis, inflammation, proliferation or remodelling.

3. Principles of wound management and choice of closure

Outline the ordered principles of managing this wound, from assessment through debridement to the decision about closure. State which mode of healing/closure you would choose and why.

Guidance: Emphasise thorough cleaning and debridement, the danger of primary closure of a contaminated wound, and the rationale for tertiary (delayed primary) intention or healing by secondary intention; include tetanus prophylaxis.

4. Preventing and recognising surgical infection

Explain how surgical infection develops in this wound using the pathogen–host–environment balance, the role (if any) of antibiotics here, and the early features that would make you suspect a necrotizing soft-tissue infection.

Guidance: Apply the Cruse–Foord balance; distinguish therapeutic antibiotics for an established/contaminated wound from prophylaxis; flag pain out of proportion, systemic toxicity and crepitus as red flags.

5. Medico-legal documentation

Describe how you would document this wound for medico-legal purposes, what to record and what to avoid, given that this is an assault case under police investigation.

Guidance: Record objective findings (site, size, shape, edges, depth); document contemporaneously and legibly; avoid speculating about the weapon or assailant; preserve the record and any consent for examination.