1. Methods Eight hundred metres fast walking on a flat ground and semisupine cycling exercise test were performed in 18 patients randomly programmed to VVIR or VVI pacing mode and compared.
   方法18例老年患者分别在具频率应答(VVIR)与无频率应答(VVI)状态下做800米快速行走及症状记分和半卧位踏车运动评价。

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