normal controls and 27 patients with ventricular pacemaker had undergone planar gated blood-pool imaging in different conditions. Result shows: （1） Pump parameters can successfully reflect theraupeutic effect of pacemaker among them EMP is the most valuable parameter for evaluating the cardiac pumping effect. （2）After implantation of the ventricular pacemaker

the LVEF didn’t increase

but the CO and EMP was significantly increased.（3）Compared with right ventricular demand pacemaker

the rate-responsive ventricular pacemaker give better hemodynamic benifit at exercise condition.（4）Through restrained cardiac pacemaker the functional change was analyzed on or off pace

and monitoring the cardiac function itself after the pacemaker was implanted.