Based on VVI mode, it's added with a mechanism of diastolic pressure change modulating pacing rate.
该起搏器以VVI模式为基础，增加舒张压的变化量对频率调节的机制。
It is concluded that in elderly patients VVIR pacing can improve symptoms, quality of life when compared with VVI.
结果提示：VVIR起搏较V VI起搏更能改善老年患者的自觉症状、提高其生活质量。
Conclusion: Amiodarone can suppress the incidence of atrial fibrillation obviously after VVI pacemaker implantation.
结论胺碘酮对植入VV I型起搏器患者心房颤动的发生有明显的抑制作用。
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。
Objective to study the velocity, strain and strain rate of the carotid arterial wall motion using velocity vector imaging (VVI) in cerebral infarction patients.
目的应用速度向量成像(VVI)技术初步探讨脑梗死患者颈总动脉管壁短轴方向运动速度、应变及应变率的特点。
It is concluded, for the patients whose cardiac function and structure was normal, there was no significantly different in left ventricular function with DDD compared to VVI at resting.
结果提示，对于心功能和心脏结构正常的患者，在静息状态下，双腔起搏和单腔起搏对心功能的影响无显著差异。
It is concluded, for the patients whose cardiac function and structure was normal, there was no significantly different in left ventricular function with DDD compared to VVI at resting.
结果提示，对于心功能和心脏结构正常的患者，在静息状态下，双腔起搏和单腔起搏对心功能的影响无显著差异。
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