Regenerative Approach for Improving Flap Survival: Perspective of Angiogenesis

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Vascular Biology

Background:

• Flap reconstruction is vital for complex wounds but faces challenges like partial necrosis and delayed healing.
• Microcirculatory dysfunction, despite restored macrocirculation, impairs tissue perfusion and flap viability.
• Understanding flap compromise as a hierarchical transport network failure is key to improving outcomes.

Purpose of the Study:

• To review vascular repair mechanisms relevant to flap compromise.
• To synthesize regenerative strategies for durable flap reperfusion.
• To identify translational challenges and requirements for regenerative flap therapies.

Main Methods:

• Review of literature on flap perfusion, microcirculatory dysfunction, and regenerative medicine.
• Synthesis of current regenerative strategies, including biologics, cell-based therapies, and biomaterials.
• Analysis of key concepts: angiosomes, choke vessels, endothelial barrier, immune regulation, and angiogenic niche.

Main Results:

• Flap compromise involves failures in endothelial barrier function, mural cell support, and immune regulation, leading to no-reflow and impaired regeneration.
• Regenerative strategies encompass recombinant factors, gene/nucleic acid delivery, cell therapies, cell-free biologics (extracellular vesicles, platelet products), and biomaterial platforms.
• These approaches aim to restore microcirculation and promote vascular repair for enhanced flap survival.

Conclusions:

• Regenerative interventions offer promising solutions for flap compromise by addressing microcirculatory dysfunction.
• Successful translation requires standardized functional perfusion endpoints and delivery parameter reporting.
• Safety-conscious designs are crucial to minimize risks like aberrant angiogenesis in post-resection settings.