Skin blood flow pattern in burns outcomes.

Area of Science:

• Burn healing research
• Vascular biology
• Dermatology

Background:

• Assessing microcirculatory function in burn scars and donor sites is crucial for understanding healing.
• Previous studies have focused on macrocirculation, but microcirculatory dynamics remain less understood.

Purpose of the Study:

• To evaluate the functional microcirculatory aspects of self-healed burns, grafted areas, and donor sites.
• To assess the microcirculatory response to stress tests (postural venular-arteriolar reflex and heating) in these areas over time.

Main Methods:

• Laser Doppler flowmetry (LDF) was used to measure resting flux, venular-arteriolar reflex (VAR), and flux during heating (41°C).
• Evaluations were performed on 10 patients with lower limb burns at discharge and at 45-day intervals during elastocompression therapy.
• Comparison was made between burn-affected areas (self-healed, grafted), donor areas, and control sites.

Main Results:

• Burn-affected areas and donor sites showed increased resting flux compared to controls, particularly self-healed burns, which trended towards normal values over time.
• Stress test responses (VAR and heating) showed similar percentage variations to normal skin, except for grafted areas.
• Grafted areas exhibited a reduced response to stress tests in the initial weeks post-engraftment, with no significant difference in response to heating.

Conclusions:

• Microcirculatory alterations persist in burn-affected and donor sites, with self-healed areas gradually normalizing.
• Grafted areas demonstrate delayed functional recovery in microvascular response to stress.
• Anatomic variations in revascularization, healing, microvascular innervation, and local responses likely contribute to observed differences.