Re: CVP's before x-ray line confirmation
This depends in part on the line insertion technique. If you are getting brisk blood return w/ syringe, then you're either in the IJ/right heart or the carotid. Pressure tubing manometry or looking at the pulsation are reliable cues as to where you are.
If they used an US to insert it the odds of correct placement are even higher.
I have put in innumerable lines as well and when I swan I don't wait for XRay- insert cordis and float SGC all in the same setting. Trust your technique and pressure reading and you're good. You can transduce a pressure at the time of insertion to tell you if you're arterial or not.
If all these indicators are good for correct placement, I would float the swan and shoot some numbers.
the CXR is primarily for the PTX r/o and to make sure the swan is in the right place.
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