burn eschar
Pronunciation: ES-kar
Thick, leathery scab of denatured protein and necrotic tissue that forms over full-thickness burn wounds.
Full Definition
Burn eschar is the characteristic thick, dry, leathery tissue that develops over full-thickness burns as a result of protein denaturation and cellular death from thermal injury. This avascular tissue appears dark brown to black and feels firm and inelastic. Eschar formation is problematic because it provides no barrier function, serves as a medium for bacterial growth, can impede circulation if circumferential, and prevents wound healing. In burn surgery practice, eschar typically requires removal through surgical excision, enzymatic debridement, or other methods before definitive wound coverage can be achieved. The timing and method of eschar removal significantly impact patient outcomes and healing time.
Usage
Usage note: Distinguish from superficial scabs; eschar is specifically thick, full-thickness tissue.
In Context
- "The burn eschar was excised down to viable tissue before applying skin grafts." — operative report
- "Circumferential burn eschar on the extremity necessitated emergency escharotomy." — emergency procedure note