[Validation of the gas exchange monitoring function of the Engström Elvira respirator].

Gas exchange monitoring (GEM) has only recently become available for routine use on ventilated patients. Engström has introduced a new concept of integrated gas exchange monitoring within the Elvira respirator, optionally combined with an external CO2 monitor. The following paper describes a laboratory validation of a prototype of this device with regard to the influence of respiratory variables within their specified ranges: FIO2 0.

Evaluation of methods for indirect calorimetry with a ventilated lung model.

A combined lung and ventilator model was built, validated and used to test commercial systems for indirect calorimetry. It simulates O2 uptake and CO2 excretion under ventilator treatment conditions. In the model inspiratory gases are diluted with N2 and CO2 to give the desired expiratory concentrations.

[A method for the determination of O2-uptake and CO2-elimination from the respiratory gases in mechanically ventilated patients (author's transl)].

A method for the assessment of O2-uptake and CO2-elimination from respiratory gases in mechanically ventilated patients is presented, the Beckman metabolic measurement cart. It was designed for exercise measurements. In patients under respirator treatment, there are problems resulting from the pressure sensitivity of the polarographic O2-electrode.