Is for anyone involved in the care of mechanically ventilated patients - Intensivists, Anaesthetists & ICU Nurses.
Explore the physiology of the ventilated lung
VentSim is a fully functioning, high fidelity, physiologically faithful mechanical ventilator simulator. It was developed by Dr. Roger Stedman for iOS using the Swift programming language. Its purpose is an educational tool for critical care doctors, nurses, therapists, and anaesthetists – essentially anyone that has an interest in the provision of safe, effective care of the mechanically ventilated patient.
VentSim uses a mathematical model of the human respiratory system (volumes, resistance and compliance) which are well established models published in the literature [link]. These have been codified with an interface developed which allows you to manipulate parameters to simulate different patient scenarios (everything from a neonate through to an adult with severe COPD and emphysema).
VentSim allows you to apply ventilator settings to your respiratory system model and then generates pressure, volume and flow signals that are displayed on your iOS device.
On launch VentSim takes you straight into the simulator view – this is your central navigation point for the app.
Set up your simulated patient
Tap the ‘Patient’ button on the right side of the navigator bar. This brings up the ‘Patient Settings’ view:
The controls will slide in from the right, allowing you to still see some of the simulator view as you make adjustments.
Select your type of patient - and then adjust weight and relative lung volume size. You will see calculated lung volumes.
Select linear or dynamic compliance
If linear is selected adjust the ‘Compliance Slider’ (mls/cmH2O).
Alternatively - explore the dynamic compliance model and try different compliance models.
Adjust the Time constant, this will adjust airway resistance according to the size and compliance of your patient.
Return to the simulator view by tapping the right arrow in the navigator bar.
Adjust your ventilator settings
Select the ‘Ventilator’ button to the left of the navigator bar. This brings up the ‘Ventilator Settings’ view:
Select your ventilator rate (bpm) and I:E ratio using the sliders. You have a choice of three ventilator modes; Pressure Control, Volume Control and Flow Control. You are able to adjust appropriate input values for each of these (Inspiratory pressure, tidal volume or inspiratory flow) as well as apply PEEP and in volume control mode add an end inspiratory pause.
Return to the simulator view to view the impact your settings have had on your patients respiratory parameters.
Optimise the simulator view
If you are finding that due to screen size information is hidden (as is the case with the iPhone SE) try turning your device on its side into landscape mode.
The simulator view in landscape mode on an iPhone SE
Each simulator graph view has a gear icon in the top right hand corner, tap this to bring up the view settings panel. This allows you to change the background color, plot color, speed of animation, animation type (default is the wrap fade mode) and plot style (line or solid).
Graph Plot View settings popover
You will notice that as you change your settings the graph plots will automatically re-scale to an optimum screen fit. The axis labels will adjust accordingly. The panel data is updated at the end of each respiratory cycle.
The ‘i’ (information) button on the navigator bar opens a mini-browser which navigates automatically to this page.
The down pointing chevron button on the navigator opens a menu with which to access other features of the simulator which allows you to switch on and off each individual view and also add in the spirometer loop view and also the compliance view.
Please feedback to:
Ratings and Reviews
Great for instructors!
I teach mechanical ventilation to respiratory therapist students and to residents. This app has come extremely handy when teaching my classes.
Thank you developer!
Way too limited!
This simulator is so limited you can’t get lung compliance below the 30s to simulate ARDS! There is no spontaneous breathing mode. There is not a way to make the patient do anything on their own. No way to do hardly anything I was hoping to be able to do.
Developer Response ,
Hi, Compliance in severe ARDS typically drops to 40mls/cmH20 from a normal of 200. The linear model will take you down to around 35. However if you switch to the dynamic model you can get it to below 20 by shifting the curve to the right using compliance point slider. Alternatively you can give your patient ‘baby lungs’ by switching to the paediatric model.
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- Roger Stedman
- 17.5 MB
- Requires iOS 10.3 or later.
- Requires iPadOS 10.3 or later.
- iPod touch
- Requires iOS 10.3 or later.
- Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
- Age Rating
- © 2018 Roger Stedman
Up to six family members can use this app with Family Sharing enabled.