Validity of Continuous Cardiac Output Measured by a Doppler Pulmonary Artery Catheter Versus Thermodilution, and Effect of Distal Angle on the Variance Between Methods
Continuous monitoring of cardiac output in patients with cardiac dysfunction or hemodynamic instability is desirable, especially if the patient is in critical condition. For the anesthesiologist, continuous monitoring of cardiac output may be helpful because it provides information which may allow more appropriate management of events during critical periods, such as weaning from cardiopulmonary bypass in cardiac surgery, or cross-clamping and declamping of the aorta in vascular surgery. A pulmonary artery catheter that allows both intermittent and continuous Doppler measurements of cardiac output has been developed (Flocath, Cardiometrics Inc., CA). In high-risk patients, we tested the hypothesis that the Doppler-estimated cardiac output (DECO) was identical to the thermodilutional cardiac output (TDCO), and that the DECO changed similarly in direction and magnitude when the TDCO changed. Further, we investigated the change in cardiac output with both techniques when the distal angle of the Flocath was altered.
KeywordsCardiac Output Abdominal Aortic Aneurysm Continuous Monitoring Pulmonary Artery Catheter Doppler Measurement