- Poster presentation
- Open Access
Assessment of stroke volume variation
© BioMed Central Ltd 2006
- Published: 21 March 2006
- Stroke Volume Variation
- Pulse Contour
- Pulse Contour Analysis
- Left Ventricular Stroke Volume
- Ventricular Stroke Volume
The specific interactions of the lungs and the cardiovascular system under mechanical ventilation cause cyclic variations of left ventricular stroke volume (SVV). Real-time measurement of SVV using arterial pulse contour analysis is useful to predict volume responsiveness and to monitor volume therapy in mechanically ventilated patients. In this study, SVV was evaluated using simultaneous recordings with the LiDCO plus system (LiDCO Ltd. Cambridge, UK) and the Vigileo (Edwards Lifesciences, Irvine, CA, USA) cardiac output monitor.
At baseline the LiDCO pulse contour cardiac output was calibrated using the bolus thermodilution technique. The setup and zeroing procedure of the Vigileo cardiac output monitor was carried out in compliance with product specifications. Nine postoperative cardiac surgical patients were included. All measurements were carried out during standard clinical care. In stable clinical conditions, changes in SVV were forced by changes in tidal volume (Vt), the level of PEEP and leg-raising procedures. In all patients a total of 134 data pairs were evaluated using linear regression and Bland-Altman statistics.
The agreement in SVV measured with the LiDCO and Vigileo cardiac output computer is acceptable. We found a slight, but significant, difference in SVV between the LiDCO and Vigileo cardiac output monitoring systems. For adequate interpretation of differences of SVV, more disclosure of the used mathematical models is essential.