Medical introduction
A person in his 50s introduced to the emergency division with palpitations. He had a background of arrhythmic proper ventricular cardiomyopathy. He had beforehand undergone the position of a dual-chamber implantable cardioverter-defibrillator for atrioventricular block and ventricular tachycardia (VT). The machine was programmed in a dual-chamber rate-modulated pacing mode with a decrease charge of 80 beats per minute (bpm), an higher monitor/sensor charge of 120 bpm, paced atrioventricular delay (P-AVD) and sensed atrioventricular delay of 190 and 150 ms, respectively, ventricular security pacing on and mode swap on. His common drugs included flecainide and bisoprolol.
A 12-lead ECG was obtained demonstrating a ventricular charge of 133 bpm (determine 1A). Following the infusion of intravenous magnesium and amiodarone, the …