• Timothy R Ball, Benjamin C Culp, Vivekkumar Patel, David F Gloyna, David P Ciceri, and William C Culp.
• Division of Cardiothoracic Anesthesiology, The Texas A&M University System Health Sciences Center College of Medicine, Scott & White Memorial Hospital, Temple, TX 76508, USA. tball@swmail.sw.org
• J. Cardiothorac. Vasc. Anesth. 2010 Oct 1;24(5):762-6.

ObjectivesTo compare cardiac output (CO) measurements from a novel endotracheal bioimpedance cardiac output monitor device (ECOM; ConMed, Irvine, CA) to simultaneous pulmonary artery thermodilution (TD) CO.DesignProspective study.SettingOne academic hospital.ParticipantsForty volunteer patients undergoing cardiac surgery.InterventionsIntraoperative CO measurements.Measurements And Main ResultsSimultaneous comparative data points were collected from ECOM and TD at 4 periods: post-induction, post-sternotomy, post-cardiopulmonary bypass, and post-chest closure. The mean CO(TD) was compared with CO(ECOM) for each operative period then assessed for agreement by linear regression, Bland-Altman analysis, and percent error methods. There were 35 men (87.5%) with a mean age of 66 ± 10.7 years in the present study population. R values (p value) for the 4 time periods were 0.50 (0.002), 0.33 (0.035), 0.42 (0.007), and 0.48 (0.002). Bias and 95% limits of agreement in L/min were -0.11 (-2.40 to 2.18), 0.04 (-2.57 to 2.65), -0.06 (-2.86 to 2.74), and 0.02 (-2.42 to 2.45). Percent errors of the 4 time periods were 51%, 53%, 50%, and 48%.ConclusionsECOM did not adequately agree with TD in patients undergoing cardiac surgery.Copyright © 2010 Elsevier Inc. All rights reserved.

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