3.1 ECG Characteristics
Through direct ECG review, the mean heart rate was 68.0 ± 10.9 bpm, and the QTc interval was 420.0 ± 18.4 ms. There were 14 patients (4.1%) with QT prolongation (Table 1). Sinus tachycardia was found in 4 of the 340 patients with RA (1.1%), and sinus bradycardia was found in 80 patients (23.5%). At baseline, 31 patients (9.1%) had conduction disorders. Arrhythmia was found in 63 patients (18.5%), with 37 having premature atrial contractions, 19 having premature ventricular contractions, 5 having both, and 2 having atrial fibrillation.