Does pressure matter in creating burns in a porcine model?

Area of Science:

• Biomedical Engineering
• Dermatology
• Wound Healing Research

Background:

• Validated animal models are crucial for burn injury research.
• Direct contact heat sources are common for burn infliction.
• Previous studies suggested burn depth is independent of applied pressure.

Purpose of the Study:

• To investigate the hypothesis that burn depth increases with applied pressure in a porcine model.
• To quantify the relationship between pressure and burn injury depth.

Main Methods:

• Forty mid-dermal contact burns were created on pigs using a brass bar at controlled pressures (0.2-4.5 kg).
• Burns were inflicted using a spring-loaded device for precise pressure application.
• Histologic analysis of collagen injury depth was performed using Elastic Van Gieson staining.

Main Results:

• A significant direct association was found between applied pressure and the depth of complete and partial collagen injury (r=0.73 and r=0.65, respectively).
• Increasing pressure from 0.2 kg to 4.5 kg significantly increased burn depth (ANOVA, P < .001 for complete injury).
• Mean depth of complete collagen injury ranged from 0.51 mm (gravity only) to 1.65 mm (4.5 kg).

Conclusions:

• Applied pressure is a significant factor influencing burn depth in a porcine model.
• Findings contradict previous assumptions that pressure does not affect burn depth.
• Standardization of pressure is recommended for future burn infliction studies.