Temperature effects on surface pressure-induced changes in rat skin perfusion: implications in pressure ulcer...

Area of Science:

• Biomedical Engineering
• Dermatology
• Physiology

Background:

• Local skin temperature influences tissue response to mechanical stress.
• Understanding these interactions is crucial for managing pressure-induced skin injuries.

Purpose of the Study:

• To investigate the effects of local skin temperature on pressure-induced changes in skin perfusion and deformation.
• To evaluate the potential of therapeutic heating in mitigating pressure-related skin damage.

Main Methods:

• Experiments were conducted on hairless rats using a computer-controlled plunger to apply surface pressure and measure skin deformation.
• Laser Doppler flowmetry assessed skin perfusion under varying temperatures (28°C and 36°C) and pressures (3.7 to 73 mmHg).
• Skin creep and relaxation were measured to assess tissue stiffness.

Main Results:

• Heating increased skin perfusion at low pressures (≤18 mmHg) but not at high pressures (>18 mmHg).
• Increased pressure initially raised perfusion, then decreased it, reaching zero at pressures over 55 mmHg.
• Heating increased tissue stiffness, reducing deformation under pressure.
• Reactive hyperemia following pressure release was enhanced by heating.

Conclusions:

• Local skin temperature significantly impacts skin perfusion and mechanical properties under pressure.
• Therapeutic heating may be beneficial for pressure-induced skin alterations at lower pressure levels.
• Findings are relevant for understanding skin blood flow, deformation, and pressure ulcer treatment.