Postoperative Remote Ischemic Conditioning (RIC) significantly improves entire flap microcirculation beyond 4 hours

Area of Science:

• Microsurgery
• Vascular Surgery
• Tissue Engineering

Background:

• Free flap transfer is a cornerstone of soft tissue reconstruction.
• Impaired flap perfusion and microcirculatory failure can lead to partial or total flap loss.
• Remote ischemic conditioning (RIC) has shown promise in improving microcirculation.

Purpose of the Study:

• To investigate the effects of RIC on different perfusion zones within free flaps.
• To determine the duration of RIC's effects on flap microcirculation.
• To assess RIC's potential to mitigate flap failure.

Main Methods:

• A study involving 25 patients undergoing free perforator-based adipo-cutaneous flap transfer.
• Application of RIC using a tourniquet (3 cycles of 10 min ischemia/10 min reperfusion).
• Continuous microcirculation measurement using an O2C device on postoperative days 1, 3, and 5, with probes in flap center and distal edge.

Main Results:

• Twenty patients were analyzed, showing significant improvements in flap blood flow (+19.6%) and oxygen saturation (+15.7%) with RIC.
• These perfusion enhancements were consistent across all flap zones.
• The beneficial effects of RIC on flap perfusion persisted for at least 4 hours post-application.

Conclusions:

• Postoperative RIC can enhance overall flap perfusion.
• RIC may serve as an adjunctive therapy to prevent microcirculatory disorders.
• This approach could reduce the risk of tissue necrosis, particularly in distal flap areas.