Objective To explore the improvement of techniques of right atrial catheterization in rats.Methods\20 Sprague-Dawley rats were used for the right atrial catheterization surgery.The rats after surgery were randomly divided into 2 groups,10 in each group: Group A: the catheter was directly inserted inside the opening hole of the wire spring group,and group B: the catheter was inserted from the lateral side of the wire spring.The catheter was fixed in the body and pulled out from the neck back followed a fixed...