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Cardiac output estimation after off-pump coronary artery bypass: a comparison of two different techniques

Dheeraj Arora1, Rajesh Chand, Yatin Mehta

  • 1Department of Anaesthesiology and Critical Care, Escorts Heart Institute and Research Centre, New Delhi, India.

Annals of Cardiac Anaesthesia
|July 25, 2007
PubMed

Insights

A new non-invasive device, the Ultrasonic Cardiac Output Monitor (USCOM), accurately estimates cardiac output (CO) in post-surgery patients. It shows excellent agreement with the standard bolus thermodilution technique.

Area of Science:

  • Cardiovascular physiology
  • Medical device technology
  • Surgical outcomes

Background:

  • Accurate cardiac output (CO) monitoring is crucial for managing critically ill patients.
  • Non-invasive methods are preferred to minimize patient risk.
  • The Ultrasonic Cardiac Output Monitor (USCOM) is a novel device for continuous CO assessment.

Purpose of the Study:

  • To compare the accuracy of the USCOM against the established bolus thermodilution (TD) technique for CO measurement.
  • To evaluate the agreement between USCOM and TD in post-off-pump coronary artery bypass graft surgery patients.

Main Methods:

  • A prospective, non-randomized study involving 30 patients post-coronary artery bypass graft surgery.
  • Quadruplicate measurements of CO were taken using both USCOM and TD.
  • A total of 120 paired observations were analyzed.

Main Results:

  • The mean CO values were 4.63 L/min for TD and 4.76 L/min for USCOM.
  • The mean bias between TD and USCOM was -0.13 L/min.
  • The limits of agreement were -0.86 to 0.59 L/min, indicating good concordance.

Conclusions:

  • The USCOM demonstrates very good agreement with the bolus thermodilution technique for CO estimation.
  • This non-invasive device shows potential as a reliable tool for cardiac output monitoring in postoperative cardiac surgery patients.

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