Fig. 1From: Measuring energy expenditure in the intensive care unit: a comparison of indirect calorimetry by E-sCOVX and Quark RMR with Deltatrac II in mechanically ventilated critically ill patientsSchematic illustration of instrument connections to the ventilator circuit. 1. HME Filter. 2. Mainstream capnography to ventilator. 3. COVX flowmeter. 4. Three-way stopcock. 5. Y-piece. 6. Quark turbine flowmeter. 7. Adapter from calibration syringe. 8. Corrugated tube. 9. Adapter for Deltatrac FiO2 sampling. 10. Evita XL ventilator. ETT Endotracheal tube, FiO 2 fraction of inspired oxygenBack to article page