Objective To investigate the optimal AV delay by means of evaluation of the hemodynamics at different AV delay in patients with a DDD pacemaker implanted.
目的对不同房室延迟DDD起搏患者进行血流动力学评价，探讨DDD起搏最佳房室延迟的设置方法。
Compared with the control, the vacuum package or adding deoxidant package with materials of low venting quality can constrain the accelerating speed of PV and AV, and delay rancidity.
采用低透气性的包装材料进行真空包装或添加脱氧剂包装，可明显抑制过氧化值和酸价的增加速度，延缓酸败。
Compared with the control, the vacuum package or adding deoxidant package with materials of low venting quality can constrain the accelerating speed of PV and AV, and delay rancidity.
采用低透气性的包装材料进行真空包装或添加脱氧剂包装，可明显抑制过氧化值和酸价的增加速度，延缓酸败。
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