Comparison of Stroke Volume Variations Derived From Radial and Femoral Arterial Pressure Waveforms During Liver Transplantation

BackgroundStroke volume variation (SVV) is being increasingly used to predict fluid responsiveness. Since radial arterial pressure (RAP) and femoral arterial pressure (FAP) frequently showing discrepancies during liver transplantation (LT), we sought to investigate the effect of differing arterial waveforms on SVV and cardiac output (CO) derived from the Vigileo device, by comparing SVV and CO values derived from RAP (SVVRAP, CORAP) and FAP (SVVFAP, COFAP) during LT.MethodsThe linear associations and agreements between SVVRAP and SVVFAP and between CORAP and COFAP were assessed during LT. Hemodynamic variables were measured at nine predefined time points in all 32 recipients, resulting in 288 data pairs.ResultsCorrelations were observed between SVVRAP and SVVFAP (r = .961) and between CORAP and COFAP (r = .848) at all time points. These correlations between SVVRAP and SVVFAP (r = .923) and between CORAP and COFAP (r = .902) existed even during the period when mean RAP and FAP values differed (10 minutes after reperfusion). Bland-Altman analysis for SVVRAP versus SVVFAP and for CORAP versus COFAP showed weak biases (−0.2% and −0.5 L/min) and reasonable limits of agreement (−2.2 to 1.8% and −1.9 to 0.9 L/min). The percentage errors for SVV and CO values were 27.0% and 22.2%.ConclusionsThere was no significant difference between SVVRAP and SVVFAP when measured using the Vigileo device during LT. This finding indicated that SVV obtained using the Vigileo device offered relatively consistent information regardless of the catheterization site.