Abstract: ObjectiveTo analyze long R－R intervals in ambulatory electrocardiography (AECG) (expect atrial fibrillation in full time), and to probe into the significance of clinical and the cause of long interval. MethodsRetrospective analysis of 65 cases of R－R interval ≥2.0 s in 2 500 AECGs from the June 2009 to the June 2011 was made, and various types of pathogens of long R－R intervals and their electrocardiogram changes were collected. ResultsThe occurrence of long R－R intervals was 2.60 ％(65／2 500). Patients over 50 years old accounted for 92.30％(60／65), and common pathogens were coronary heart disease, high blood pressure. The electrocardiogram changes which cause long intervals were ranged in descending order as sinus arrest 43.08％(28／65),blocked premature atrial contraction 20.00 ％(13／65), artrioventricular block (Mobitz typeⅡ) 18.46 ％(12／65), artrioventricular block(Mobitz typeⅠ) 10.77 ％(7／65),sinoatrial block 3.08％(2／65),compensatory pause after atrial tachycardia 3.08 ％(2／65),complete artrioventricular block 1.53 ％(1／65). Conclusion24 hours AECG is a secure and effective examination for long R－R intervals. The pathogens of long intervals and various types of electrocardiogram changes have been found out, which is significant for clinical job.

Key words: 24 hours ambulatory, long R－R interval, electrocardiography