Technical systems for measuring and displaying FRC and CO
The colorimetric ELFA (cELFA) measures CO2 in the main gas stream, calculates FRC and CO and displays the result on a tablet.
IR ELFA, a sampling CO2 analyzer and a laptop for registering and displaying FRC and CO.
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The only commercially available device that employed the differential Fick method for calculating cardiac output was the NICO unit from Respironics - Philips. It operated with a disposable valve allowing rebreathing and was designed for patients on mechanical ventilation in the OR.
It is no longer on the market. This is how it looked like:
