A burn victim presents with a wound that is painless, appears charred and leathery, and does not blanch on pressure. What is the depth classification of this burn?

Explanation

## Clinical Features and Depth Classification of Burns **Key Point:** The combination of painlessness, charred/leathery appearance, and absence of blanching response is pathognomonic for full-thickness (3rd degree) burns. These clinical signs reflect complete destruction of all skin layers including nerve endings and blood vessels. ### Clinical Features by Burn Depth | Feature | Superficial 1st | Superficial 2nd | Deep 2nd | Full-Thickness 3rd | Subdermal 4th | |---|---|---|---|---|---| | **Color** | Red | Blistered, red/pink | Mottled red/white | Charred, white, brown | Black, charred | | **Pain** | Severe | Severe | Minimal/absent | Absent | Absent | | **Blanching** | Blanches | Blanches | May not blanch | Does NOT blanch | Does NOT blanch | | **Texture** | Dry | Wet, blistered | Leathery | Charred, leathery | Charred, hard | | **Healing** | Spontaneous | Spontaneous | Slow, scarring | Requires grafting | Requires grafting/amputation | **High-Yield:** The **blanching test** (capillary refill response) is a critical bedside discriminator: - **Blanches** = viable dermis (1st or 2nd degree) - **Does NOT blanch** = full-thickness or deeper (3rd or 4th degree) **Clinical Pearl:** Full-thickness burns are painless because all nerve endings in the epidermis and dermis are destroyed. The surrounding partial-thickness burn area (which retains nerve endings) will be exquisitely painful, creating a painful rim around a painless center. **Mnemonic:** **CHAR = Complete Harm to All Responsive tissue** — full-thickness burns show charring, painlessness (no responsive nerves), and no blanching (no viable capillaries). ### Why This Is Full-Thickness, Not Deep Partial Deep partial-thickness burns may appear mottled and leathery BUT retain some pain sensation and may show slow blanching response. The **complete absence of pain and blanching** in this case indicates destruction of all nerve endings and blood vessels, which only occurs in full-thickness burns.