title: Cardiac output estimation with a new Doppler device after off-pump coronary artery bypass surgery.
abstract: OBJECTIVE
  To compare cardiac output (CO), stroke volume (SV), and cardiac index (CI) as estimated with a new, noninvasive Doppler device (Ultrasonic Cardiac Output Monitor [USCOM]; USCOM Ltd, Sydney, Australia) with those measured with the bolus thermodilution (TD) technique.
  
  
  METHODS
  Prospective nonrandomized study.
  
  
  METHODS
  Postcardiac surgery recovery unit of a tertiary cardiac center.
  
  
  METHODS
  Fifty patients after off-pump coronary artery bypass (OPCAB) surgery.
  
  
  RESULTS
  Both right-sided and left-sided CO were estimated with a USCOM continuous-wave (CW) Doppler device, and CO was determined with the bolus TD technique performed in triplicate. On comparing the right-sided CO, SV, and CI with those of TD, the mean bias was 0.03 L/min, 1.6 mL, and 0.02 L/min/m(2), respectively. The comparison of left-sided CO, SV, and CI with those of TD revealed a means bias of 0.14 L/min, 1.0 mL, and 0.08 L/min/m(2), respectively.
  
  
  CONCLUSIONS
  This study showed excellent agreement between the values for CO, SV, and CI as determined with USCOM and TD. Since there was only 1 time period for CO estimation in each patient with both methods, the stability of this correlation needs to be further investigated over time.
authors.affiliation: Department of Anesthesiology and Critical Care, Escorts Heart Institute and Research Centre, New Delhi, India.
authors.forename: Rajesh
authors.initials: R
authors.lastname: Chand
authors.forename: Yatin
authors.initials: Y
authors.lastname: Mehta
authors.forename: Naresh
authors.initials: N
authors.lastname: Trehan
mesh_terms: D000328:Adult; D000368:Aged; D002302:Cardiac Output; D047549:Coronary Artery Bypass, Off-Pump; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D011446:Prospective Studies; D013318:Stroke Volume; D013815:Thermodilution; D018608:Ultrasonography, Doppler