Local macromolecular extravasation in thermal burns quantified by fluorescent video microscopy and computer vision

Area of Science:

• Biomedical Engineering
• Microcirculation Research
• Burn Injury Mechanisms

Background:

• Understanding microvascular responses to thermal injury is crucial for developing effective treatments.
• Previous models have limitations in quantifying macromolecule transport at burn sites.

Purpose of the Study:

• To develop and validate a dorsal skin flap chamber model for analyzing microvascular responses to local thermal burns.
• To quantify the extravasation and interstitial transport of macromolecules following thermal injury.

Main Methods:

• A dorsal skin flap chamber model was utilized in conjunction with fluorescein isothiocyanate-tagged dextran.
• Contact burns were induced using a thermostated metal rod at temperatures ranging from 55°C to 70°C.
• Fluorescence microscopy and advanced image processing were employed to analyze dextran distribution and accumulation.

Main Results:

• The model successfully visualized and quantified macromolecule extravasation and interstitial transport.
• Interstitial transport of dextran increased with burn temperature up to 70°C.
• At 70°C, other factors significantly reduced macromolecule leakage from the vasculature.

Conclusions:

• The developed dorsal skin flap chamber model is effective for studying microvascular responses to thermal burns.
• Burn temperature significantly influences macromolecule transport, with a threshold effect observed around 70°C.
• Further research is needed to elucidate the factors limiting macromolecule loss at higher burn temperatures.