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LEFT INTRAVENTRICULAR BALLOON PUMP ORTIMIZATION DURING INTRACTABLE CARDIAC ARREST

By ΛΑΖΑΡΟΣ ΚΟΧΕΙΛΑΣ

Abstract

THE LEFT INTRAVENTRICULAR BALLON PUMP HAS BEEN PROVED AN EFFECTIVE METHOD OF MECHANICAL CIRCULATORY SUPPORT,WHEN IT WAS USED IN EXPERIMENTAL SETTING ON DOGS WITH CARDIAC ARREST.ITS PERFORMANCE,THOUGH,CAN BE OPTIMIZED BY IMPROVING THE FEATURES OF THE CATHETER-MOUNTED BALLON.THIS EXPERIMENTAL WORK EXPLORES THE HEMODYNAMIC EFFECT OF INTRAVENTRICULAR BALLON PUMPING DURING VENTRICULAR FIBRILATION,WITH BALLONS DIFFERING IN SHAPE AND VOLUME.THE LEFT VENTRICULAR AND DIASTOLIC VOLUME(LVEDV)WAS DETERMINED (BY MEANS OF 2D ECHO)IN 12 ANESTHETIZED DOGS AND VENTRICULAR FILBRILATION WAS INDUCED BY DIRECT CURRENT APPLICATION.A CATHETER-MOUNTED BALLON WAS INSERTED INTO THE LEFT VENTRICLE THROUGH AN INTRODUCER PLACED AT THE CARDIAC APEX.BALLON PUMPING WITH A FIXED RATE OF 75 CYCLES/MIN WAS INITIATED.THE PRIMING VOLUME COULD RANGE WITHIN CERTAIN LIMITS(LVEDV+-25%).BALLON PRIMED WITH VOLUME EQUAL TO THE LVEDV MAINTAINED THE HIGHEST MEAN SYSTOLIC AORTIC PRESSURE AND AORTIC FLOW(106,4+-2,7 MMHG AND 84,7+-2.35 ML/KG/MIN RESPECTIVELY)COMPARED TO THE SMALLER BY 25% OR THE LARGER BY 25% BALLON(P =0,002).FIVE DIFFERENT BALLON SHAPES(AT LEAST TWO IN EVERY DOG)WERE SUBSEQUENTLY IN 12 ANESTHETIZED DOGS WITH VENTRICULAR FIBRILATION :1)SPHERICAL 2)PEAR-SHAPED BALLON WITH THE GATHETER RUNNING THROUGH THE BALLON3)WITH A SHAPE BEING THE CAST OF THE LEFT VENTRICLE 4)BICONVEX-SHAPED BALLON 5)PEAR-SHAPED BALLON MOUNTED AT THE DISTAL TIP OF TTHE GATHETER.(ΑΠΟΚΟΠΗ ΠΕΡΙΛΗΨΗΣ)

Publisher: National and Kapodistrian University of Athens
Year: 1996
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