Figure 1From: Separated right and left ventricular excitation during right ventricular septal pacing in a patient with narrow QRS wave: a case report Twelve-lead electrocardiogram during atrium-only pacing. The patient experienced a Wenckebach-type second-degree atrioventricular block during atrium-only pacing at 60bpm (beats per minute). The width of the QRS wave was 120ms.Back to article page