Ventilator Waveforms (Scalars) And Loops - Basic Concepts - Pressure, Flow, And Volume

Ventilator waveforms, also known as scalars, and loops can be tricky topics to grasp. In this video we introduce the pressure, flow, and volume waveforms/scalars. We discuss their normal shapes, including how their shapes may change when the ventilator is in volume control versus pressure control. We correlate different parts of their shapes to what is happening physiologically or on the ventilator. We then go into how these shapes may change with different respiratory changes or ventilator adjustments. After that, we discuss the pressure:volume and flow:volume loops. Again, going into their normal shapes, including the lower and upper inflection points, and how these shapes may change depending on what respiratory abnormality is occurring.
Ventilator Waveforms (Scalars) And Loops - Basic Concepts - Pressure, Flow, And Volume
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[@sinclair657]

Thank you

[@nareshkushwah568]

Simplified Explanation...nice.

[@WhiteboardMedicine]

We appreciate the kind words and thanks for checking out the video!

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[@khaledhbenhusainbenhusain404]

it is really helpful ...... thanks

[@WhiteboardMedicine]

Always our pleasure! Thanks for checking out the video and for commenting!

[@guytelfer1353]

Volume(fluid, evaporated fluid, gasses(possibly liquid) , temp(different temperatures for different substances), assisted or not breathing , filtering ect, is there a protocol set by professionals like you or are you advising or making protocols you can share with others in the medical field considering there are many technicians ventilating with different techniques as well as different schools and teachers teaching the same subject ? How important is the temperature of the air brought in under ventilation and can the temperature create complications?

[@Nurivange]

Thanks 😊

[@WhiteboardMedicine]

Always our pleasure!

[@MA-in2it]

Please complete I have exam

[@WhiteboardMedicine]

We aren’t sure what this is?

[@navedhasan2328]

I thought the pressure control is box shaped vs volume control

[@WhiteboardMedicine]

Great question. So which is square shaped depends on the scalar you’re looking at. Volume control has a square shaped flow scalar and pressure control has a square shaped pressure scalar. This is a manifestation of how the breath is being delivered by the ventilator

[@bellasbastyan9400]

Should l change to simv if l saw that patient took breath

[@WhiteboardMedicine]

There isn’t any evidence we are aware of that you should change to SIMV. Patients frequently take breaths on their own on both pressure and volume control!

[@bellasbastyan9400]

@@WhiteboardMedicine what they told us is vc and pc doesn’t allow patient to breath it’s controlled by machine at all there’s no spontaneous!!!??

[@rtjunkie3]

@@bellasbastyan9400 Yes pressure control and volume control is when a patient isn't allowed to breathe and will ONLY get what you set on the ventilator despite patient effort but most modern ventilators don't really do this mode anymore. Instead, they now use Pressure control / assist control or PC/AC and volume control / assist control or VC/AC. It allows you to set the parameters, doesn't allow the patient to breathe spontaneously, but it allows the patient to TRIGGER breaths. These triggered breaths will always be whatever you set on the ventilator. So the patient is on VC/AC 500/5 x 12 meaning the patient will always receive 12 breaths per minute with 500cc of tidal volume, however, if my patient triggers a breath, it will always be that set 500cc volume. Now if I want my patient to have the ability to breathe SPONTANEOUSLY, I will use Volume or pressure control / Synchronized Intermittent mandatory ventilation or VCorPC/SIMV. The only difference is now I am setting a Pressure Supported breath for my patient which will allow them to generate their own time and depth of each breath. So patient is on VC/SIMV 500/5 x 12 with a Pressure Support of 10cmH2O. This means that in 1 minute my patient will have 12 breaths that will always get a mandatory 500cc tidal volume but if the patient is also breathing on their own, the additional breaths are spontaneous and will be supported with a pressure of 10cmH2O so the volume will vary based on respiratory mechanics and patient effort. Hope that helps!