Comparison of the endotracheal cardiac output monitor to thermodilution in cardiac surgery patients.
OBJECTIVE
To 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.


METHODS
Prospective study.


METHODS
One academic hospital.


METHODS
Forty volunteer patients undergoing cardiac surgery.


METHODS
Intraoperative CO measurements.


RESULTS
Simultaneous 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%.


CONCLUSIONS
ECOM did not adequately agree with TD in patients undergoing cardiac surgery.
Ball
Timothy R
TR
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
Culp
Benjamin C
BC
Patel
Vivekkumar
V
Gloyna
David F
DF
Ciceri
David P
DP
Culp
William C
WC
D000368:Aged; D002302:Cardiac Output / Q000502:physiology*; D006348:Cardiac Surgical Procedures / Q000379:methods*; D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal / Q000379:methods*; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods*; D011446:Prospective Studies; D013815:Thermodilution / Q000379:methods