Objective: to observe the improvement effects of biventricular pacing therapy in heart failure patients by clinic symptom and relative heart function parameters.
目的：评价双心室起搏对顽固性心力衰竭患者的临床症状及相关心功能指标的影响。
Objective: to observe the improvement effects of biventricular pacing therapy in heart failure patients by clinic symptom and relative heart function parameters.
目的：评价双心室起搏对顽固性心力衰竭患者的临床症状及相关心功能指标的影响。
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