A Var file (.vr3) represents a particular model of the respiratory system at a particular point in time. To learn more about how Var files and Script files are used to build scenarios, please refer to Tips and Tricks #1 – Vars v. Scripts.
A Var file is comprised of two major groups of settings:
You can run the simulation with a sequence of Var files or just one.
For example, to set up a Var file to model a paralyzed adult patient with ARDS:
Once you connect a ventilator to the simulator, you can then demonstrate, for example, how to calculate respiratory system mechanics using the ventilator’s waveform displays. The values you get by manual analysis should be very close to the ones you set for the lung model.
Alternatively, you could specify an active model by the parameters of the muscle pressure waveform:
These are the main components of a Var file, but many advanced options exist for building patient models.
Special thanks to Rob Chatburn (Cleveland Clinic) for input developing this example.