title: Equivalence of bioimpedance and thermodilution in measuring cardiac index after cardiac surgery.
abstract: 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.
authors.affiliation: Pulmonary Medicine, Monterey, CA , USA.
authors.forename: W Scott
authors.initials: WS
authors.lastname: Sageman
authors.forename: Robert H
authors.initials: RH
authors.lastname: Riffenburgh
authors.forename: Bruce D
authors.initials: BD
authors.lastname: Spiess
mesh_terms: 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