A Comparison of the Transoesophageal Doppler and Thermodilution Techniques for Cardiac Output Measurement in Off-Pump Coronary Artery Bypass Surgery Patients.

Yoon,  Tae Gyoon; Yun,  Won Hee; Ham,  Byung Moon; Kim,  Yong Lak

doi:2002.43.1.15

Clinical Research Article

Korean Journal of Anesthesiology 2002;43(1):15-19.
DOI: https://doi.org/10.4097/kjae.2002.43.1.15

A Comparison of the Transoesophageal Doppler and Thermodilution Techniques for Cardiac Output Measurement in Off-Pump Coronary Artery Bypass Surgery Patients.

Tae Gyoon Yoon, Won Hee Yun, Byung Moon Ham, Yong Lak Kim

¹Department of Anesthesiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. kimyl@plaza.snu.ac.kr
²Department of Anesthesiology, Seoul National University College of Medicine, Seoul, Korea.

Abstract

BACKGROUND
The aim of this study was to compare the accuracy of measured cardiac output using the newly developed esophageal doppler device with that of the thermodilution method using a pulmonary artery catheter.
METHODS
In 15 patients undergoing off-pump coronary artery bypass surgery, cardiac outputs were measured at four episodes of surgery; (1) after induction of anesthesia, (2) during dissection of the internal mammary artery, (3) during anastomosis of the left anterior descending artery, and (4) after closure of the pericardium.
RESULTS
The bias between the two methods was 0.52 +/- 1.09 L/min. Analysis of the changes in cardiac output from sample episode 1 to 2, from sample episode 2 to 3 and from sample episode 3 to 4, expressed as percent change values, shows no significant differences between the two methods (P > 0.05).
CONCLUSIONS
The esophageal doppler accurately reflects changes in cardiac output with time when compared with that of the thermodilution.

Key Words: Cardiac output; esophageal doppler; monitoring; off-pump coronary artery bypass graft; thermodilution