Cutaneous Injuries From an Nd:YAG Laser Directed-Energy Source Utilizing a Murine Model: A Pilot Study for...

Area of Science:

• Dermatology and biomedical engineering
• Laser-tissue interactions
• Cutaneous injury research

Background:

• Directed-energy devices like Q-switched Nd:YAG lasers are common in clinical and military applications.
• A standardized animal model for laser-induced cutaneous burns is currently lacking.
• This study addresses the need for a reproducible murine model to study laser burn injury.

Purpose of the Study:

• To establish a reproducible murine model for cutaneous laser burn injury.
• To qualitatively characterize the progressive histologic severity of skin injury with increasing laser exposure duration.
• To provide a foundation for future quantitative and therapeutic studies on laser-induced skin damage.

Main Methods:

• Cutaneous laser burns were induced on mouse skin using a Q-switched Nd:YAG laser.
• Exposure durations varied (5, 10, 15, 30 seconds) at a fixed fluence (12 J/cm2) and spot size (3 mm).
• Histologic evaluation of skin specimens assessed collagen integrity, epidermal architecture, vascular changes, inflammation, and adnexal structures 72 hours post-exposure.

Main Results:

• Laser exposure duration correlated with injury severity in a time-dependent manner.
• Shorter exposures (5-10s) resulted in first-degree burns with epidermal disruption.
• Longer exposures (15-30s) caused progressive collagen disorganization, epidermal detachment, adnexal/vascular damage, and coagulative necrosis.

Conclusions:

• A reproducible murine model for cutaneous laser burn injury was established.
• The study qualitatively characterized the histologic response to Nd:YAG laser exposure.
• This model serves as a basis for future quantitative research and therapeutic investigations into directed-energy skin injuries.