PPG Accuracy
PPG Accuracy
The accuracy of Corsano CardioWatch 287 with pulse detection using photoplethysmography technology in cardiac patients was studied by S. Blok [1,2], M.A. Piek [1], I.I. Tulevski [1], G.A. Somsen [1], M.M. Winter [1,3]. In this single-centre prospective study, patients from an outpatient cardiology clinic underwent a simultaneous resting ECG and PPG recording. 180 patients a total of 7,914 ECG beats were recorded and 7,880 (99%) were also recorded by PPG. Figure 1 displays an example of a 45 second PPG and ECG measurement. The PPG-accuracy, defined as the proportion of PPG measurements within 100 ms of ECG measurements, was 94.6% (95%CI 94.1-95.1). Correlation was high for HR (R = 0.991 (95%CI 0.988-0.993), n = 180) (Figure 2A). The 95% Limits of Agreement (LoA) were -3.89 to 3.77 (mean bias -0.06) beats per minute (Figure 2). The RR-intervals on the PPG were highly correlated with those on the ECG (R = 0.966 (95%CI 0.964-0.968), n = 6,139) (Figure 3A), with a narrow 95% LoA of -85 to 85 (mean bias -1) ms (Figure 3B). This study showed that the Corsano 287 Bracelet with PPG-technology can determine HR and RR-intervals with high accuracy in cardiovascular at-risk patient population among different subgroups.
ECG vs PPG
Figure 1– Simultaneous recordings of PPG and ECG data. PPG measurement was started before and ended after the ECG registration. Non-matching PPG heartbeats were automatically matched to the closest P-top on the ECG-signal
Correlation BPM
Figure 2 – A. Correlation of HR-determination (beats per minute) between PPG and ECG. B. Limits of Agreement (LoA) of HR-determination between PPG and ECG, the 95% LoA are marked by the dotted lines.
Correlation RR Intervals
Figure 3 – A. Correlation of determination of RR-intervals between PPG and ECG; the +/- 100ms range is marked by the dotted lines. B. Limits of Agreement (LoA) of determination of RR-intervals between PPG and ECG, the 95% LoA are marked by the dotted lines.
References
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Department of Cardiology, Cardiology Centers of the Netherlands. Karel du Jardinstraat 61, Amsterdam, the Netherlands
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Department of Vascular Medicine, Internal medicine, Amsterdam UMC, University of Amsterdam, Amsterdam Cardiovascular Sciences, Meibergdreef 9, Amsterdam, The Netherlands
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Department of Cardiology, Amsterdam UMC, University of Amsterdam, Amsterdam Cardiovascular Sciences, Meibergdreef 9, Amsterdam, The Netherlands