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目的:了解扩张型心肌病患者恶性心律失常(MVA)与心率变异性(heart rate variability,HRV)的关系,探讨扩心病患者体内自主神经变化的临床意义。方法:选择扩心病患者48例作为研究对象,同时按照年龄配对,取48例正常者作为对照组,对其行24小时动态心电图检查,依据其是否出现恶性心律失常分为恶性室性心律失常(MVA+)组及单纯扩张型心肌病(MVA-)组,分析组间HRV的差异。结果:与对照组比较,单纯扩张型心肌病(MVA-)组HRV时域指标(SDNN、SDANN、RMSSD)均有降低(P<0.05)L与(MVA-)组相比,恶性室性心律失常(MVA+)组HRV相关指标进一步降低(P<0.05)。结论:自主神经功能异常是扩张型心肌病患者恶性心律失常的重要危险因子,可能可以用HRV预测其发生恶性心律失常危险性。
Objective: To investigate the relationship between malignant arrhythmia (MVA) and heart rate variability (HRV) in patients with dilated cardiomyopathy and to explore the clinical significance of autonomic nervous changes in patients with dilated cardiomyopathy. Methods: Forty-eight patients with chronic heart disease were selected as study subjects and matched with age. Forty-eight healthy subjects were selected as control group. 24-hour ambulatory electrocardiographic examination was performed. Malignant ventricular arrhythmias MVA +) group and simple dilated cardiomyopathy (MVA-) group. The difference of HRV between groups was analyzed. Results Compared with the control group, the HRV time domain indexes (SDNN, SDANN, RMSSD) in MVA group were significantly lower than those in MVA group (P <0.05) HRV related indicators in MVA + group were further decreased (P <0.05). CONCLUSIONS: Autonomic dysfunction is an important risk factor for malignant arrhythmias in patients with dilated cardiomyopathy and HRV may be used to predict the risk of developing malignant arrhythmias.