The Study On Heart Rate Variability In Patients With Abnormal Conduction Arrhythmia

Objective:To examine the features of heart rate variability of complete right bundle branch block (CRBBB), incomplete right bundle branch block (ICRBBB), first degree atrioventricular block (I °AVB) and typical preexcitation syndrome to investigate the significance of autonomic nerves on abnormal conduction.Methods:The clinical and dynamic electrocardiography(DCG)data of 223 patients hospitalized in the First Affiliated Hospital of Guangxi Medical University from April 2014 to April 2016 were retrospectively reviewed. According to the diagnostics of DCG, patients were divided into five groups: complete right bundle branch block group, incomplete right bundle branch block group, first degree atrioventricular block group, preexcitation syndrome group and normal control group. The heart rate variability time-domain analysis index of the three groups were compared with the normal control group respectively.Results:There were no statistically significant difference between the heart rate variability time-domain analysis index (SDNN, SDANN, SDNN Index, rMSSD, pNN50, triangular index) of the complete right bundle branch block, incomplete right bundle branch block group and those of normal control group (P>0.05).The SDNN of first degree atrioventricular block was higher than normal control group, and the difference was statistically significant (P<0.05). However, there were no statistically significant difference between the other heart rate variability index (SDANN, SDNN Index, rMSSD, pNN50, and triangular index) of the first degree atrioventricular block and those of normal control group (P>0.05). The SDNN, SDANN, SDNN Index and triangular index of preexcitation syndrome was higher than normal control group, and the difference was statistically significant (P<0.05). However, there were no statistically significant difference between the other heart rate variability time-domain analysis index (rMSSD and pNN50) of the preexcitation syndrome and those of normal control group (P>0.05).Conclusion:The influence of autonomic nerve on the complete or incomplete right bundle branch block is not significant. The first degree atrioventricular block and appearance of preexcitation syndrome wave are accompanied with autonomic nerve dysfunction, which are characterized by increased vagus nerve tension. Heart rate variability can be used as a reference indicator to identify the autonomic nervous function on abnormal conduction.