Cardiac symptoms and exercise tolerance improved from baseline to a similar degree in the two study groups.
2
心室率随窦性频率的增加而增加，具有频率跟踪作用，增加了病人运动耐量。
The ventricular rate will ascend following the increase of sinus rate, having frequency tracking function. The exercise tolerance of patient will be increased.
3
所有的患者都有心血管症状，并且在运动耐量测验后，进行了中位数为6.5年的随访。
All patients had cardiovascular symptoms and were followed for a median of 6.5 years after exercise thallium testing.
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