Study of the transapical left ventricular bypass combined with pulsatile assist device

Abstract

Two types of pulsatile assist devices were combined with transapical left ventricular bypass circuit, cylinder type combined with balloon for IABP and PBP-Model 20, in order to obtain the effect of counterpulsation. The hemodynamic effect of these devices were evaluated in calves with healthy or failing heart.
The experiment showed the following results:
1) PBP-Model 20 is superior in the effect of counterpulsation, damage of blood, and thrombus formation to the cylinder type device.
2) PBP-Model 20 showed the typical signs of diastolic augmentation and systolic unloading on the aortic pressure wave form.
3) PBP-Model 20 could be run for a week without any problem; it showed the sign of counter pulsation effect on the aortic pressure wave form throughout the experimental period.