ECOM Medical, Inc.

This Study will compare the accuracy of the ECOM Plus Endotracheal Cardiac Output Monitor (ECOM) without the use of the arterial pressure waveform from the arterial line to 1) the current clinical standard of cardiac output measured by intermittent room temperature bolus thermodilution using a PAC, 2) the current ECOM System with the use of the arterial blood pressure waveform from a radial arterial line and 3) the Flo-Trac® System.