143864.fig.001a
(a)
143864.fig.001b
(b)
Figure 1: (a) The baseline 12-lead electrocardiogram (ECG) in the supine position shows accelerated idioventricular rhythm (AIVR) without atrioventricular conduction. The arrows indicate the P wave. (b) The ECG in the standing position immediately after exercise. The waveforms of limb leads in the standing position differ from those in the supine position.