Zaman T, Kyriacou P A, Pal S K
Annu Int Conf IEEE Eng Med Biol Soc. 2013;2013:4046-9. doi: 10.1109/EMBC.2013.6610433.
The successful salvage of a free flap is dependent on the continuous monitoring of perfusion. To date there is no widely accepted and readily available post-operative monitoring technique to reliably assess the viability of free flaps by continuously monitoring free flap blood oxygen saturation. In an attempt to overcome the limitations of the current techniques a reflectance photoplethysmographic (PPG) processing system has been developed with the capability of real-time estimation of arterial oxygen saturation (SpO2) levels implemented in LabVIEW. This system was evaluated in clinical measurements on five patients undergoing breast reconstruction using Deep Inferior Epigastric Perforator (DIEP) flap. Good quality PPG signals were obtained from the flaps and fingers simultaneously. The estimated free flap SpO2 values were in broad agreement with the oxygen saturation readings from the commercial pulse oximeter. The results suggest that reflectance free flap photoplethysmography can be used as a continuous monitoring technique to non-invasively monitor the perfusion of free flaps.
游离皮瓣的成功挽救取决于对灌注情况的持续监测。迄今为止，尚无广泛接受且易于使用的术后监测技术，能够通过持续监测游离皮瓣血氧饱和度来可靠地评估游离皮瓣的存活情况。为克服现有技术的局限性，已开发出一种反射式光电容积脉搏波描记法（PPG）处理系统，该系统具备在LabVIEW中实现实时估计动脉血氧饱和度（SpO2）水平的能力。该系统在5例接受腹壁下深动脉穿支（DIEP）皮瓣乳房重建术的患者的临床测量中进行了评估。同时从皮瓣和手指获得了高质量的PPG信号。估计的游离皮瓣SpO2值与商用脉搏血氧仪的血氧饱和度读数大致相符。结果表明，反射式游离皮瓣光电容积脉搏波描记法可作为一种连续监测技术，用于无创监测游离皮瓣的灌注情况。
