• Bruce Hullett, Neville Gibbs, William Weightman, Mark Thackray, and Mark Newman.
• Department of Anesthesia, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Australia 6009.
• J. Cardiothorac. Vasc. Anesth. 2003 Dec 1; 17 (6): 728-32.

ObjectiveTo compare CardioQ esophageal Doppler cardiac output and thermodilution cardiac output during off-pump coronary artery bypass surgery.DesignProspective clinical study.SettingUniversity-affiliated teaching hospitalParticipantsAdult patients (n = 20) undergoing elective coronary artery bypass surgery without cardiopulmonary bypass.Measurements And Main ResultsThree hundred thirty-one comparisons of simultaneous CardioQ and thermodilution cardiac outputs were made. The Pearson correlation coefficient for the pooled data was 0.62. Using a Bland-Altman approach, the overall bias was -0.56 L/min with a precision of 0.64 L/min. The 95% limits of agreement (bias +/- 2 SD) were -0.56 +/- 1.28 L/min. For individual patients, the bias ranged from -1.35 L/min to 0.27 L/min and the precision from 0.24 L/min to 0.74 L/min.ConclusionBecause of the wide limits of agreement and the large interpatient differences in both bias and precision, the CardioQ esophageal Doppler cardiac output cannot currently be recommended as an alternative to thermodilution cardiac output during off-pump coronary artery bypass surgery.

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