Hi I am new to critical care nursing and had a question about changing pressure tubing on PA lines. Once PA line, CVP injectate, etc are primed and ready to connect to patient, does the patient have to be flat to switch over tubing? I know for zeroing, CO, insertion/removal you do but to change over lines specifically does it matter? I was also taught you needed to clamp/pinch the CVP and PA catheter prior to the switchover - what have you found to be the best way with the stiff PA/CVP catheter, pinching or using clamp? I heard you should not use a hemostat to avoid damaging the line. Appreciate any insight.