Circadian Rhythms Of Premature Ventricular Contractions And Non-sustained Ventricular Tachycardia Originated From The Right Ventricular Outflow Tract

Objectives: To explore the circadian rhythms of premature ventricular contractions(PVC) and non-sustained ventricular tachycardia (NSVT) originated from the rightventricular outflow tract (RVOT).Methods: Surface ECG was used to identify PVC and NSVT originating from theRVOT. Holter was used for recording and analyzing PVC and NSVT for24hours.Results: Seventy-five patients with RVOT PVC/NSVT were enrolled into this study.Single PVC was more at the daytime than that at the night, the peak was at12th hourand17th hour, respectively; the low ebb was from0~10th hour. Couple PVC alsoshowed that more at the daytime than that at the night, the peak was at13th hour and20th hour, respectively. However, NSVT presented that inverse pattern that less at thedaytime and more at the night. The peak was at21st hour and2nd hour during night,respectively. The low ebb was from8th to17th hour during the daytime.Conclusion: Different pattern of circadian rhythms of PVC and NSVT from the RVOTis beneficial for guiding the clinical treatment.