Dr Sriram's comments are correct and are sincerely appreciated. The closed method of measuring CVP does not compromise the aseptic quality of an IV hyperalimentation (IVH) infusion system. However, this method can be used only if the infusion system lends itself to this approach. The two circumstances in which the closed method of measuring the CVP may be used are (1) when the electronic infusion-control device being used has a valve on its cassette that may be positioned manually so as to cause the system to be in the continuous free-flow position or (2) when gravity is used to cause infusion of the solution. In the latter situation, an electronic IV controller may or may not be in use. In both situations, the solution must be contained in either container, which would be vented to the atmosphere, or in a flexible container, which need not be vented to
Vazquez RM. Measuring Central Venous Pressure Through Hyperalimentation Catheters-Reply. JAMA. 1982;248(7):830. doi:10.1001/jama.1982.03330070018015
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