Changes in sinus RR interval patterns preceding ventricular ectopic beats: assessment with rate enhancement and...

Changes in heart rate preceding ventricular ectopic beats may be used to identify clinical subsets of patients. We evaluated RR interval patterns preceding ventricular ectopic beats with a rate enhancement method which estimates ventricular ectopic beat dependence on the sinus RR interval preceding the ventricular ectopic beat and the dynamic heart rate trend, which is based on the slope of the five RR intervals preceding the ventricular ectopic beat. Using these two methodologies in 176 patients with frequent ventricular ectopic beats we identified several unique subsets of patients: (1) bradycardia-enhanced patients were younger with a high proportion of males and longer, more variable coupling intervals; (2) tachycardia-enhanced patients exhibited sleep suppression of ventricular ectopic beats and had shorter, less variable coupling intervals; (3) patients with predominantly no change in RR preceding the ventricular ectopic beat were significantly older, with greater prevalence of cardiovascular disease and reduced sinus RR variability, indicating decreased autonomic nervous system activity. These two methods may serve as a basis for further investigations regarding the treatment and prognosis of ventricular ectopic beats.