Figure 2 | Scientific Reports

Figure 2

From: Unobtrusive Nocturnal Heartbeat Monitoring by a Ballistocardiographic Sensor in Patients with Sleep Disordered Breathing

Figure 2

Bland-Altman plots of the analysed heartbeats. To generate the plots, 10% of all recorded heartbeats (n = 326040) were randomly selected to avoid clutter. (A) Mean differences of all analysed heartbeats for BCG and ECG. The mean difference of simultaneously recorded heartbeats for ECG and BCG is 15 ± 162 ms. (B) Mean differences of all analysed heartbeats for BCG and ECG filtered with QI ≥ 0.4. The mean difference for simultaneous recorded heartbeats is 4 ± 72 ms after filtering. By filtering for better signal quality, the BCG cycle length detection improves accuracy at the cost of the absolute number of analysable heartbeats.

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