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作者对２３例安装永久性起搏器患者，采用二维超声，比较起搏器植入前后血流动力学的变化。结果显示：植入后心房按需起搏（ＡＡＩ）组和心室按需起搏（ＶＶＩ）组的心排血量均明显增加（Ｐ＜０．０５），分别增加４０．６％和２１．２％；但植入后ＶＶＩ组的左室射血分数、每搏量、左室舒张末期容积均降低（Ｐ＜０．０５），ＡＡＩ组无变化。研究表明ＡＡＩ生理性起搏对于患者血流动力学的改善优于ＶＶＩ非生理性起搏。心排血量是评价血流动力学改善的敏感指标
The authors of 23 patients with permanent pacemaker installation, the use of two-dimensional ultrasound, compared pacemaker implanted hemodynamic changes. The results showed that the volume of cardiac output in AAI group and VVI group increased significantly (P <0.05) after implantation, with an increase of 40.6% and 21% respectively. 2%. However, the volume of left ventricular ejection fraction, stroke volume and left ventricular end-diastolic volume in VVI group after VVI implantation were all decreased (P <0.05), but there was no change in AAI group. Studies have shown that AAI physiologic pacing improves hemodynamics better than VIV non-physiologic pacing. Cardiac output is a sensitive indicator of hemodynamic improvement