Equivalence of bioimpedance and thermodilution in measuring cardiac index after cardiac surgery.
OBJECTIVE
To compare thoracic electrical bioimpedance (TEB) cardiography versus pulmonary artery thermodilution (TD) derived cardiac index in patients after cardiopulmonary bypass.


METHODS
Prospective, blinded electronic data collection.


METHODS
Intensive care unit of a military hospital.


METHODS
Post-cardiopulmonary bypass patients for primary comparison between technologies (n = 20) and patients for comparison of variability within each technology (n = 20).


METHODS
None.


RESULTS
Cardiac index values by TEB or TD were collected simultaneously. Linear regression, Lin's concordance correlation coefficient, bias, and precision measures within the large data set group and within each patient over time were calculated. Linearity in regression and Lin's concordance correlation coefficient of 0.99 were shown. A bias of 0.07 L/min/m(2) and precision of 0.40 L/min/m(2) were within acceptable clinical limits, as were equivalence test results.


CONCLUSIONS
TEB is equivalent to TD-derived cardiac index in postoperative cardiac surgery patients.
Sageman
W Scott
WS
Pulmonary Medicine, Monterey, CA , USA.
Riffenburgh
Robert H
RH
Spiess
Bruce D
BD
D002302:Cardiac Output; D006348:Cardiac Surgical Procedures; D002307:Cardiography, Impedance; D002315:Cardiopulmonary Bypass; D006801:Humans; D007362:Intensive Care Units; D008991:Monitoring, Physiologic; D011182:Postoperative Care; D011184:Postoperative Period; D011446:Prospective Studies; D013815:Thermodilution