Absolute confirmation of placement of a central venous pressure catheter is done with which of the following?
a. Chest X-ray
b. Checking the centimeter mark
c. Ensuring appropriate waveform
d. Drawing a blood sample through the cath-eter
ANS: A
A chest X-ray is used most often to confirm the placement of the central venous pressure (CVP) catheter. Checking the centimeter mark may be deceiving because the catheter may be curling up inside a vessel. Ensuring the waveform is not always accurate because other values may be low enough to appear to be a CVP measurement. Due to arterial blood gas acid-base changes and oxygenation problems, the blood sample drawn may appear to be mixed venous, when in fact it is not.
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