Figure Legends
Figure 1 (A) Electrocardiography (ECG) strips of case 1: (a) ECG strip shows atrial fibrillation (AF) with slow ventricular response (SVR) before cardioversion. (b) ECG strip revealed junctional bradycardia after electrical cardioversion. (B) ECG strips of case 2: (a) ECG strip shows AF with SVR before cardioversion. (b) ECG strip revealed complete atrioventricular block after electrical cardioversion.
Figure 2 (A) 24-hour Holter tracing of case 1 demonstrated repeated non-sustained ventricular tachycardia (NSVT). (B) 24-hour Holter tracing of case 2 also demonstrated repeated NSVT.
Figure 3 (A) Rhythm strip in the pacemaker of case 1 showed sustained ventricular tachycardia (VT), which had degenerated to ventricular fibrillation. (B) Rhythm strip of case 2 recorded in defibrillator demonstrated polymorphic VT.
AP, atrial pacing; PVC, premature ventricular contraction; SIR, sensor-indicated rate; VP, ventricular pacing; VS, ventricular sensing.