Analysis of dynamic ECG monitoring
Two hours dynamic ECG monitoring showed that 18 (81.8%) patients had cardiac arrhythmias. Figure 2A-D showed representative ECG examples of cardiac arrhythmias. The most common arrhythmia was sinus tachycardia which occurred in 17 (77.3%) patients. The median maximum heart rate during monitoring was 108.5 bpm (IQR, 101-114 bpm). However, patients with sinus tachycardia showed a similar palpitation score with those without sinus tachycardia (median [IQR], 3 [2.5-4] vs 2 [1.5-3.5], P =0.23) (Figure 3A). In addition, there was no significant relationship between maximum heart rate and palpitation score among the 22 patients (r =0.323; 95% CI, -0.11-0.66;P =0.14) (Figure 3B). Other arrhythmias included atrial premature contraction in 2 (9.1%) patients, atrial tachycardia in 1 (4.5%) patients, and ventricular premature contraction in 1 (4.5%) patients. No bradyarrhythmias were detected.