Schematic of laboratory set-up.

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Presentation transcript:

Schematic of laboratory set-up. Schematic of laboratory set-up. CO2 and air are allowed to mix to any desired concentration using a computer-controlled motorised valve. This mixture is drawn in by the patient on inspiration and expired via a three-way valve. Inspired and expired CO2 concentrations and respiratory flow were measured and fed back to an online computer program to establish the position within the ventilatory cycle and to display this and the end-tidal CO2. Resham Baruah et al. Open Heart 2014;1:e000055 ©2014 by British Cardiovascular Society