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British Journal of Anaesthesia, 2001, Vol. 87, No. 2 212-222
© 2001 The Board of Management and Trustees of the British Journal of Anaesthesia

Clinical Investigations

A comparison of cardiac output derived from the arterial pressure wave against thermodilution in cardiac surgery patients

J. R. C. Jansen1, J. J. Schreuder2, J. P. Mulier3, N. T. Smith4, J. J. Settels5 and K. H. Wesseling5

1Department of Intensive Care, Leiden University Medical Centre, The Netherlands. 2Department of Cardiac Surgery, San Raffaele Hospital, Milan, Italy and CARIM, University of Maastricht, The Netherlands. 3Department of Anaesthesiology, University of Leuven, Belgium. 4Department of Anaesthesiology, University of California San Diego, CA, USA. 5TNO Biomedical Instrumentation, Academic Medical Centre, Amsterdam*Corresponding author

{dagger}Financially supported in part by Edwards Co., Anaheim, CA, USA. Dr Wesseling holds a patent on the cardiac output method. TNO has no interest in the cardiac output method.

In three clinical centres, we compared a new method for measuring cardiac output with conventional thermodilution. The new method computes beat-to-beat cardiac output from radial artery pressure by simulating a three-element model of aortic input impedance, and includes non-linear aortic mechanical properties and a self-adapting systemic vascular resistance. We compared cardiac output by continuous model simulation (MF) with thermodilution cardiac output (TD) in 54 patients (18 female, 36 male) undergoing coronary artery bypass surgery. We made three or four conventional thermodilution estimates spread equally over the ventilatory cycle. In 490 series of measurements, thermodilution cardiac output ranged from 2.1 to 9.3, mean 5.0 litre min–1. MF differed +0.32 (1.0) litre min–1 on average with limits of agreement of –1.68 and +2.32 litre min–1. Differences decreased when the first series of measurements in a patient was used to calibrate the model. In 436 remaining series, the mean difference became –0.13 (0.47) litre min–1 with limits of agreement of –1.05 and +0.79 litre min–1. When consecutive measurements were made, the change was greater than 0.5 litre min–1, on 204 occasions. The direction of change was the same with both methods in 199. The difference between the methods remained near zero during surgery suggesting that a single calibration per patient was adequate. Aortic model simulation with radial artery pressure as input reliably monitors changes in cardiac output in cardiac surgery patients. Before calibration, the model cannot replace thermodilution, but after calibration the model method can quantitatively replace further thermodilution estimates.

Br J Anaesth 2001; 87: 212–22


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