Conclusion: Meta ⅱ-1204 pacemaker improves cardiac output and exercise capacity in patients with bradycardias. Although the onset of rate response is relatively slow, the increment of pacing rate is proportional to exercise workload. 结论:MetaⅡ-1204型起搏器可改善心动过缓者的运动耐量和心输出量,其起搏频率适应幅度与运动负荷相关性好,但频率适应速度较迟缓。