• Joseph D Tobias.
• Department of Anesthesiology, University of Missouri, Columbia, MO 65212, USA. tobiasj@health.missouri.edu
• South. Med. J. 2009 Mar 1;102(3):256-9.

IntroductionA central venous pressure (CVP) measurement is used to assess intravascular status. Although this is usually accomplished by the placement of a central venous catheter (CVC), there are circumstances when placement may be technically difficult or impossible. The current study evaluates the feasibility of measuring CVP from a peripheral intravenous (IV) cannula in the prone position.MethodsCVP was simultaneously measured from a central venous catheter (CVC-P) and from a peripheral IV cannula (PVP). The continuity of the peripheral IV cannula with the central venous system was demonstrated by a change in the PVP during a sustained inspiratory effort.ResultsThe study cohort included 18 patients. All patients had 2 peripheral IV cannulae, and 10 PVP measurements were taken from each site. In 4 of the 36 cannulae (11%), there was no increase in the PVP in response to a sustained inspiratory effort. For these 4 cannulae, the PVP to CVC-P difference was 13 +/- 4 mm Hg. In the 32 cannulae in which the PVP increased in response to a sustained inspiratory effort, the PVP to CVC-P difference was 2 +/- 1 mm Hg (P < 0.0001), and the difference between the PVP and the CVC-P was ConclusionProvided that the PVP increases to a sustained inspiratory breath, there is a clinically useful correlation between the PVP and the actual CVP in the prone position.

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