Conclusion: Cardiac permanent pacing can improve heart function of patients with chronic arrhythmia, DDD and AAI modes were better than VVI mode.
结论：心脏永久起搏能有效改善缓慢心律失常患者的心功能，DDD及AAI模式优于VVI模式。
To evaluate the hemodynamic effects of different pacing mode, we studied changes of hemodynamics before and after the cardiac pacing.
本文采用超声心动图研究了心脏起搏前、后的血液动力学变化 ，以评价不同起搏方式的血液动力学效应。
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