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| Comparative analysis of heart rate variability in patients with discordant or concordant left bundle branch |
| LI Yu, LIN Suhua, YANG Lijuan |
| (Department of Cardiac Function, Zhongshan Hospital of Xiamen University, Xiamen Fujian 361004, China) |
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Abstract Objective To analyze the changes of cardiac autonomic function in patients with discordant or concordant left bundle branch block (LBBB). Methods A total of 112 patients manifested by LBBB in ECG were selected for ambulatory electrocardiography examination. There were 80 patients with discordant LBBB (discordant group) and 32 patients with concordant LBBB (concordant group). We analyzed heart rate variability (HRV) time domain indexes of SDNN, SDANN and ASDNN, and compared the incidence of HRV decrease between the two groups. Results The SDNN, SDANN and ASDNN values of the discordant group are significantly lower than those of the concordant group (P＜0.05). In the concordant group, HRV indexes of 6 cases (18.75%) are reduced. In the discordant group, HRV indexes of 36 cases (45.00%) are reduced. The incidence of HRV decrease in the discordant group is significantly higher than that in the concordant group (P＜0.05). Conclusion Compared with the concordant group, the patients in the discordant group are more prone to declined cardiac autonomic regulation function and instable electrical activities, which leads to a higher risk of cardiovascular events. Clinicians should pay more attention to making timely diagnosis, treatment and follow-up for patients with discordant LBBB to reduce complications and mortality.
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