From RK:md.

The endotracheal cardiac output monitor (ECOM) isn’t an ordinary endotracheal tube. It’s lined with bioimpedence sensors to measure hemodynamic parameters like cardiac output/index, stroke volume and variation, heart rate, and even systemic vascular resistance. The ECOM automatically compensates for changes in endotracheal tube position and the body position (which often changes during surgery). In addition to an arterial line, the only data the monitor needs is the patient’s height, weight, and age. Cool!
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Modern ways of assessing cardiac output are often times riddled with caveats and limitations. The behavior of electricity in tissues and with fluctuations in blood motion have given rise to interesting areas like bioimpedance and bioreactance. The ECOM’s electrodes are situated more-or-less directly posterior to the ascending aorta - a perfect area to measure cardiac output. With each cardiac cycle, changes in blood flow create a change in electrical resistance. When coupled with waveform monitoring and changes in impedance, a stroke volume can be calculated to ultimately determine the overall cardiac output. The tech and med geek in me are in love. 
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I don’t use ECOM tubes in practice but had the opportunity to play with these as an anesthesiology resident. Beat-to-beat stroke volume assessment can be incredibly useful in the OR and ICU settings, so I’m excited to see technologies like this! 
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