## Investigation of Choice for Burn Depth Assessment ### Laser Doppler Flowmetry (LDF) **Key Point:** Laser Doppler flowmetry is the most specific non-invasive investigation for assessing burn depth and predicting healing potential by measuring microvascular blood flow in burned tissue. **High-Yield:** LDF can differentiate between: - Superficial partial-thickness burns (preserved blood flow) - Deep partial-thickness burns (reduced or absent blood flow) - Full-thickness burns (no blood flow) ### Why LDF is Superior | Investigation | Principle | Timing | Accuracy | Clinical Use | |---|---|---|---|---| | Laser Doppler Flowmetry | Measures microvascular perfusion | Early (within 24-48 hrs) | 95% for depth prediction | Gold standard for non-invasive assessment | | Thermography | Infrared temperature mapping | Early | Moderate | Adjunct only; affected by ambient temperature | | Histopathology | Microscopic tissue examination | Late (requires biopsy) | 100% | Confirmatory; invasive; delays treatment | | Ultrasound | Echogenicity assessment | Early | Poor | Limited role; cannot assess perfusion | **Clinical Pearl:** LDF provides real-time assessment of tissue perfusion and helps identify the "zone of stasis" (potentially salvageable tissue), guiding decisions on conservative vs. surgical management. **Mnemonic:** **FLOW** = **F**iber optic **L**aser **O**xygen **W**aveform — measures blood flow directly in burn tissue. ### Clinical Application In this case, the patient presents with deep partial-thickness burns (leathery, painless). LDF would: 1. Confirm the depth (reduced perfusion in deep partial-thickness) 2. Identify any full-thickness areas requiring early escharotomy 3. Guide timing of skin grafting 4. Predict healing potential and need for surgical intervention
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