Noninvasive Measurement of Cardiac Output during General Surgery Using Transtracheal Doppler

Abstract

In order to evaluate the accuracy of cardiac output (CO) measured by the transtracheal Doppler method (TTCO), we compared TTCO with CO measured by thermodilution method (TDCO). Simultaneous measurements of TTCO and TDCO were repeated in 8 patients undergoing general surgery. In each patients, correlation of TTCO to TDCO was assessed by least squares linear regression method. TTCO showed good correlation to TDCO in each patients (p<0.05). Transtracheal doppler method was concluded to be a useful method to monitor the change in CO during general anesthesia.