Swan-Ganz Catheter Insertion

The goal of this prospective randomized controlled study is to investigate the effect of pause of advancement of the Swan-Ganz catheter, which is to check whether the Swan-Ganz catheter arrive exactly at the right ventricle or not, on success rate of final placement and required time in Swan-Ganz catheterization. The question which the investigators are trying to answer is: Continuous advancement of Swan-Ganz catheter without intended pause in the right ventricle to check whether the Swan-Ganz catheter arrive exactly at the right ventricle will decrease the trial number and required time to success final placement of Swan-Ganz catheter?