## Zones of Thermal Burn Injury **Key Point:** Jackson's classification divides burn tissue into three concentric zones based on severity and viability. The zone of stasis is the intermediate zone with the most critical prognostic significance. ### Three Zones of Burn Injury | Zone | Histopathology | Blood Flow | Viability | Prognosis | | --- | --- | --- | --- | --- | | **Zone of Coagulation (Central)** | Complete necrosis, protein denaturation, charring | Absent | Non-viable | Fixed | | **Zone of Stasis (Intermediate)** | Edema, microvascular thrombosis, reversible cellular injury, inflammatory cell infiltration | Compromised | Potentially salvageable | Depends on resuscitation & management | | **Zone of Hyperemia (Outer)** | Vasodilation, increased vascular permeability, inflammatory response | Intact | Viable | Usually recovers | **High-Yield:** The zone of stasis is the **critical zone** because: - It determines whether the burn will progress to deeper necrosis or heal - Inadequate fluid resuscitation → microvascular thrombosis → progression to necrosis - Adequate resuscitation → preservation of tissue viability **Clinical Pearl:** The zone of stasis can be salvaged by aggressive fluid resuscitation (Parkland formula), topical antibiotics, and early escharotomy if needed. This is why early and adequate resuscitation is crucial in the first 24–48 hours post-burn. **Mnemonic:** **"CSH"** — **C**oagulation (dead), **S**tasis (salvageable), **H**yperemia (healthy). ### Mechanism of Stasis Zone Formation 1. Heat causes direct cellular injury and protein denaturation 2. Inflammatory mediators (cytokines, complement, ROS) cause microvascular thrombosis 3. Edema develops due to increased capillary permeability 4. Reduced perfusion leads to hypoxia and reversible ischemic injury 5. Without intervention, ischemia progresses to irreversible necrosis [cite:Reddy & Murty Forensic Medicine 33e Ch 12]
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