Objective:To compare the effect of three different concentrations of heparin saline flushing fluid of artery piezometer tube after extracorporeal circulation.Methods:90 patients after open heart surgery under cardiopulmonary bypass were randomly divided into A,B,C three groups with 30 cases in each.A,B,C three groups were respectively used 0.1 ‰,1 ‰,2‰heparin saline flushing fluid for flushing.The artery piezometer tube plugging incidence rate and incidence rate of catheter site bleeding,extravasated blood ...