Therefore when one inserts the CuP line from the sub clavian vein this is one of the good ways to know that the tip of the CVP is in RA. Very rarely the CVP tip may go upwards or to opposite side of sub clavian vein which can be detected only by an X-Ray chest later on.
Another way to know correct placement is by detection of an supra ventricular extra systole when the guide were is manipulated.
A third method is to connect the CVP to a pressure transducer and detect typical upward "abc" and downward "xy" waves.
