Abstract
Perfusion monitoring plays an important role in determining tissue oxygenation. This paper presents a non-invasive method to monitor peripheral blood flow changes, as an indicator for perfusion. A transmission mode finger sensor and a vascular Doppler ultrasound monitor were used to acquire photoplethysmograph (PPG) and blood velocity data. A series of vascular occlusion tests were conducted on 7 healthy human volunteers using a pressure cuff, to induce changes in peripheral blood flow conditions. The high frequency PPG signal (PPG AC ) pulse amplitude was determined as an estimate for volumetric blood flow. Results shows PPG AC amplitude can detect changes in peripheral flow, with respect to the ultrasound Doppler. The two measurements showed good positive correlation (R2=0.705/ However, this correlation may degrade with significant dynamic change in vessel diameter and/or at high blood flow conditions.
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