Comparative Study of Venous Pressure Obtained From Central and Peripheral Venous Catheter
Background: Venous pressure can be measured by placing Central venous catheter (CVC) and Peripheral venous catheter (PVC). Venous pressure recording obtained from CVC is called central venous pressure (CVP) and that obtained from PVC is called peripheral venous pressure (PVP). PVC is easy to place and free of complication and sometimes preferable in some cases. CVC though used commonly is not free from complications. We investigate the feasibility and accuracy of measuring PVP and precise correlation between PVP and CVP.
Methods: In this prospective, observational study, a total of 2522 readings of CVP and PVP were obtained from 60 patients in varying positions before and after 500 ml of fluid challenge intraoperatively.
Results: Throughout the study period, PVP persistently showed a positive trend with a significantly higher value than CVP (P < 0.001). Correlation for the entire data showed a significant consistency of CVP-PVP difference [r = 0.89 (95% CI: 0.87 to 0.90); p<0.0001)]. Tests of correlation revealed that whenever CVP trends changed rapidly so did PVP trends, and in synchrony with each other. The results revealed strong correlation between CVP and PVP (r2=0.79).
Conclusion: Our study suggests that CVP and PVP change similarly due to changes in intravascular volume in a given patient. The CVP-PVP gradient is not similar between patients; therefore it is not possible to predict CVP from PVP unless the gradient in the individual patient is known beforehand.
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