Instantaneous venous oxygenation estimation using Photoplethysmograph (PPG) waveform
نویسندگان
چکیده
In this study oesophageal photoplethysmograph data from eight patients under positive pressure ventilation was analysed to test the hypothesis that the modulations created by the ventilation in the AC PPG single could be used to estimate the venous saturation. In order to estimate the instantaneous arterial and venous saturation Smoothed-pseudo WignerVille Distribution (SPWVD) was utilised. The result from this study showed that there was no significant different in the conventional (time domain) arterial saturation and the instantaneous arterial saturation. However, the instantaneous venous saturation estimated with the ventilator modulation were significantly lower then the conventional arterial saturation (P=0.008) and also from the instantaneous arterial saturation (P=0.008)
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