Morphological changes in the vascularisation of delayed flaps in rabbits

Area of Science:

• Plastic Surgery
• Vascular Biology
• Surgical Techniques

Background:

• Pectoralis major myocutaneous flaps are vital in reconstructive surgery.
• Understanding flap vascularization is critical for surgical success.
• The delay phenomenon's impact on flap vascularity requires detailed investigation.

Purpose of the Study:

• To investigate the effect of the delay phenomenon on pectoralis major myocutaneous flap vascularization.
• To quantify changes in vascularity following flap delay procedures.
• To explore the underlying mechanisms contributing to enhanced vascularization.

Main Methods:

• Study conducted on 32 rabbits with pectoralis major myocutaneous flaps.
• Flaps underwent various delay procedures; vascularization assessed via tissue transparency.
• Control group of 16 undelayed flaps used for comparison.
• Skin vascularization analyzed using light microscopy and morphometric analysis in a subset of flaps.

Main Results:

• Delayed flaps demonstrated a statistically significant increase in vascularization compared to undelayed flaps (P < 0.0001).
• Average vascular area in delayed flaps was 0.04 mm², significantly higher than the 0.01 mm² in undelayed flaps.
• Nonspecific inflammatory reactions and angiogenesis were observed, potentially contributing to increased vascularization.

Conclusions:

• The delay phenomenon markedly improves the vascularization of pectoralis major myocutaneous flaps.
• Enhanced vascularity is associated with inflammatory responses and angiogenesis.
• These findings support the clinical utility of flap delay in improving surgical outcomes.