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Ann Thorac Surg 1992;53:706-708
© 1992 The Society of Thoracic Surgeons

Articles

Inaccuracy of cardiac output by thermodilution during acute tricuspid regurgitation

Paul M. Heerdt, MD, PhD*, Charles G. Pond, MD, George A. Blessios, MD, Michael Rosenbloom, MD

Divisions of Cardiothoracic Anesthesiology and Surgery, Washington University School of Medicine, St. Louis, Missouri, USA

Accepted for publication September 27, 1991.

* Address reprint requests to Dr Heerdt, Department of Anesthesiology Washington University School of Medicine, 660 South Euclid, Box 8054, St. Louis, MO 63110.

We have been comparing cardiac output measured with a novel Doppler pulmonary artery catheter to that measured by thermodilution and aortic electromagnetometry in cardiac surgical patients. We report here our observation of a nearly twofold increase in thermodilution cardiac output after the acute intraoperative onset of tricuspid regurgitation that was not confirmed by the novel catheter or direct measurement of aortic blood flow. We conclude that in some patients, acute tricuspid regurgitation may lessen the reliability of thermodilution cardiac output.




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