Accuracy of stop-cursor method for determining systolic and pulse pressure variation.

Background: Functional hemodynamic indicators (systolic pressure variation [SPV and SPV%] and pulse pressure variation [PPV%]) are sensitive and specific indicators of fluid responsiveness. It was unknown if these indicators could be accurately measured directly from the bedside monitor.

Objective: Determine the accuracy of SPV, SPV%, and PPV% measurements by using a stop-cursor method compared with a digitized analog strip (gold standard).