In order to adjudge and evaluate the limit of control ability of SMEC IABP system, which ECG R-wave trigger system is applid to set the deflation start and end, so the inflation duration is set automatically, using a mocked up circuits, in-vitro tests were run. Under conditions of heart rate 170〜190/min, defaltion start R-wave trigger, driving with helium gas, the timing setting ability of the control system was perfect. IABP was employed for the failing heart with atrial fibrillation after cardiac surgery of severe valvular disease. In all cases, positive left ventricle assist effects were obtained.
