Fig. 1

II-lead ECG findings indicating the change from atrial flutter to sinus rhythm (a): Atrial flutter, which exhibited the atrioventricular conduction between 2:1 and 4:1, occurred prior to dental surgery. (b)/(c): Intravenous initial low dose diltiazem (3 μg/kg/min), which was administered by continuous infusion using a syringe pump to prevent cardiovascular disorders such as atrial flutter-induced supraventricular tachyarrhythmia, progressively restored sinus rhythm with success after converting atrial flutter into atrial fibrillation