Clinical Analysis of Long R-R Interval in Dynamic Electrocardiogram of the Aged

Objective:To explore the clinical significances of long R-R interval in dynamic electrocardiogram (DCG) of the aged. Methods:Two hundreds and twenty-eight aged patients experienced obvious chest tightness,dizziness,amaurosis or syncope were assigned into group A and 146 middle-aged patients with the same symptoms in the same period were assigned into group B. Clinical data of DCG was analyzed retrospectively. Results:The incidence of coronary heart disease (CHD) (54.8%) and sick sinus syndrome (SSS) (9.7%) were obviously higher in group A than those in group B (35.6% and 3.4%,P0.01,P0.05); the slowest heart rate (39.1±6.3) beats per minute (bpm) were obviously lower in group A than that in group B (45.2±9.6) bpm (P0.01),and the slowest heart rate 40 bpm accounted for 57.9% were obviously higher than that in group B (25.3%,P0.01). There were more long R-R intervals in DCG caused by persistent atrial fibrillation in group A (46.9%) than those in group B (28.8%,P0.01); the long R-R intervals were more commonly less than 4000 ms (P0.05) in both groups; in group A,long R-R interval occurred in activities was 45.6%,at rest was 54.4%,the difference has no statistical significance (P0.05); In group A,27.6% patients met indication of permanent pacemaker implantation which was higher than that in group B 17.1 % (P0.05),patients' symptoms were improved in both groups with medicine treatment after permanent pacemaker implantation(P0.05). Conclusions:Long R-R intervals detected in DCG of the aged were most common in persistent atrial fibrillation caused by CHD and SSS,and the time was more commonly less than 4 000ms,and also had no obvious correlation with activities,permanent pacemaker implantation was an effective treatment for the aged.