Figure 6. Noises or temporary interruption of ECG signals during the monitoring. (A) Noises or temporary interruption of ECG signals were observed during the ECG monitoring:1) electromyographic noise; 2) electrode motion artifacts; 3) temporary interruption of ECG signals due to longer distance (over 3–5 m) between the Duranta and the iPhone. (B) The graph shows the relationship between the actual monitoring time and ECG noises/interruption percentage. ECG, electrocardiogram. r, correlation coefficient.