Assessment of Stroke Volume Variation Perioperativelyby Using Arterial Pressure with Cardiac Output

Objective To observe the sensitivity of stroke volume variation （SVV） for assessing volume changeduring induction period of general anesthesia.Methods Patients who underwent orthopaedic surgery under general anesthesia and mechanicalventilation were divided into two groups randomly. Patients in the group Ⅰwere subjected to progressivecentral hypovolemia and correction of hypovolemia sequentially; patients in the Group Ⅱ were exposed tohypervolemia alone. Each step was implemented after 5 minutes when the hemodynamics was stable. SVV andcardiac index （CI） were recorded, and Pearson＇s product-moment correlation was used to analyze correlationbetween SVV and CI.Results Forty patients were included in this study, 20 cases in each group. For group Ⅰ patients,SVV was increased significantly along with blood volume reduction, and changes in CI were negativelycorrelated with changes in SVV （r=-0.605, P〈0.01）; SVV decreased significantly along with correction ofblood volume; changes in CI were negatively correlated with changes in SVV （r=-0.651, P〈0.01）. For groupⅡ patients, along with blood volume increase, SVV did not change significantly; changes in CI revealed nosignificant correlation with changes in SVV （r=0.067, P〉0.05）.Conclusion SVV is a useful indicator for hypovolemia, but not for hypervolemia.