The bias between measurements increases as the systemic vascular resistance decreases. There is a moderate correlation with changes in cardiac output after fluid administration, but a poor correlation with changes in cardiac output after increases or decreases in norepinephrine administration. FloTrac® measurements often underestimate the cardiac output and have unacceptably high percent error, which ranges from 30% to 60%. However, in patients with septic shock and other clinical states associated with low systemic vascular resistances, such as cirrhosis, the FloTrac® does not provided acceptable correlation with independent measurements with pulmonary artery catheters. ![]() These devices perform relatively well in stable patients undergoing surgery and having an acceptable percentage error in differences between the FloTrac® device and invasive monitoring using pulmonary catheters. Consequently, it provides a method to determine hemodynamic status, changes in the clinical course and responses to therapeutic interventions in patients who have arterial catheters in place. ![]() ![]() The FloTrac®/Vigileo device uses arterial pressure waveform analysis to calculate stroke volume and cardiac output it does not require calibration against an independent measurement of cardiac output.
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