Contrastive Study About Flow Of Three Venous Return Tubes For Adult Cadiopulmonary Bypass

With medicine developing , cardiac surgery has been operated extensively. At present, hundreds thousand cardiac operations were performed all over the world every year. The development of open heart surgery promoted the evolvement of cardiopulmonary bypass(CPB). In the first open heart surgery with CPB performed in America 1951, doctors found it bringing many serious results , such as the broken of blood components , the ill effect of hemodilution and the inflammatory reaction caused by contact between blood and CPB tubes etc . Therefore , doctors have improved the equipments and methods of CPB continually to lighten it's bad influence to human body.The components of CPB had been improved greatly , such as blood pump ,oxygenator and filtrator etc , but the configuration of tube was no changed. 1.27cm2 ( 1/2+3/32inch) venous return tube has been used as standard configuration for many years. Reviewed literatures , we did not find studies about it's rationality and science. During 1996 to 2001 , three different diameter venous return tubes [two 0.5cm2(3/10+l/20inch), 1.0cm2(0.44+3/32inch) and 1.27cm2 (l/2+3/32inch) ] were used in CPB at Department of Cadiothoracic Surgecy, The First Affiliated Hospital, Medical College ,Zhejiang University. This study reviewed CPB records during 1996 to 2001 , analyzed and contrasted the maximal flow of three kind venous return tubes.The main objects of this study: 1. collect CPB records during 1996 to 2001 2. evaluate dates of weight and flow by SPSS 10.0 software 3. analyze the rationality and advantage of 1.0cm2 (0.44+3/32inch) venous return tube.Materials and methodsThree kind venous return tubes were used in 817 operations during 1996 to 2001 , all patients' age >16 years. Clinical materials include: gender , age , operation type , body weight, maximal flow and number of death. All dates were evaluated by SPSS 10.0 software.Results1 the weight of patients used three kind tubes have no difference (P>0.05) .2 the maximal flow of three kind tubes have no difference (P>0.05 ) .3 causes of death about six patients has no direct relation to tube type.ConclusionThe maximal flow of 1.0cm2 (0.44+3/32inch) , two 0.5cm2(3/10+ l/20inch), and 1.27cm2 (1/2+3/32inch) venous return tubes have no difference. 1.0cm2(0.44×3/32inch) tube can be used in vast majority of adult CPB , it reduce priming volume and contact area between blood and tube, improve the draiage in CPB , is a better choice to adult CPB than 1.27cm2( 1/2×3/32 inch ) tube and two 0.5cm2(3/10 ×1/20 inch) tube.