title: A comparison of CardioQ and thermodilution cardiac output during off-pump coronary artery surgery.
abstract: OBJECTIVE
  To compare CardioQ esophageal Doppler cardiac output and thermodilution cardiac output during off-pump coronary artery bypass surgery.
  
  
  METHODS
  Prospective clinical study.
  
  
  METHODS
  University-affiliated teaching hospital
  
  
  METHODS
  Adult patients (n = 20) undergoing elective coronary artery bypass surgery without cardiopulmonary bypass.
  
  
  RESULTS
  Three 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.
  
  
  CONCLUSIONS
  Because 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.
authors.affiliation: Department of Anesthesia, Sir Charles Gairdner Hospital, Hospital Avenue, Nedlands, Australia 6009.
authors.forename: Bruce
authors.initials: B
authors.lastname: Hullett
authors.forename: Neville
authors.initials: N
authors.lastname: Gibbs
authors.forename: William
authors.initials: W
authors.lastname: Weightman
authors.forename: Mark
authors.initials: M
authors.lastname: Thackray
authors.forename: Mark
authors.initials: M
authors.lastname: Newman
mesh_terms: D000328:Adult; D015982:Bias; D001783:Blood Flow Velocity / Q000502:physiology; D002302:Cardiac Output / Q000502:physiology*; D001026:Coronary Artery Bypass / Q000379:methods*; D006801:Humans; D016343:Monitoring, Intraoperative / Q000379:methods*; D011446:Prospective Studies; D015203:Reproducibility of Results; D013815:Thermodilution / Q000379:methods; D013997:Time Factors; D018608:Ultrasonography, Doppler / Q000295:instrumentation / Q000379:methods*