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Quantifiying the Influence of Moving Artifact on the Determination of Pulse Rate Variability (PRV) from the Pulse Oximetry (SpO2) Signal Measurements

Determination of Heart Rate Variability (HRV) derived from the Pulse Rate Variability (PRV) of the SpO2 signals measurement can be used to monitor cardiac activity. One disadvantage of the use of SpO2 probe is due to existence unavoidable movement artifacts. These artifacts tend to reduce the accuracy of PRV determination. In order to quantify the influence of moving artifacts on the measured SpO2 signals, the Short-time Fourier Transform (STFT) method is used and this has not been done in previous studies. This method is regarded to be suitable since the artifacts only occurs momentarily, i.e. as the finger moves. Three modes of finger movements were simulated, in addition to the still finger as a control, i.e. in direction of up-down, left-right, and rotating one. Contributing spectra from each of these movements will be recognized, and suitable filtering schemes are then being applied to suppress the influence of these moving artifacts. Parallelly measurements using three-leads ECG were also done to determine the HRV for each of the finger movements condition. Results show that by implementing filtering scheme to each mode of finger movements may reduce the error rate in HRV determination from SpO2 measurements, i.e. from 6 - 25 % (without filtering) to be only 0 - 1.56 %. Meanwhile measurements both HRV and PRV under still finger show only 0-3.33 % difference for each of data groups.