surykatfajnyjest patient triggered breaths will be “extra” on top of the operator set resp rate in both SIMV and AC

An assisted breath is the same as a controlled breath in every way, except that it is triggered by the patients effort instead of being based off a respiratory rate. So an assisted breath in volume control ventilation with a set TV of 500mLs would be 500mLs. All of the breath characteristics would be the same as the fully controlled breath except for the fact it is patient triggered. So not much room for variation based on the patients flow demands etc. A spontaneous or pressure supported breath is also triggered by the patient but allows the patient more control over the tidal volume, flow etc. Pressure supported breaths just apply some pressure to help augment the patients tidal volume (which will vary based on patients effort) vs giving a preset tidal volume (which is what happens in an assisted breath). hope that helps

RespiratoryReview that helps indeed! Thank you for you kind reply :)

SIMV as it’s classically described will have PS breaths. How ventilator companies label it will vary a lot but the principles will be the same. I’ve never heard of an SIMV mode that doesn’t allow PS breaths. Perhaps you can share an example with everyone?

@@RespiratoryReview yea its on my school notes. SIMV is described on its own , and then PS is described on its own. and the next slide is SIMV+P/S, and both waveforms are drawn which is why I get confused what's accurate and not. THANK YOU

Please share with everyone the specifics (reference) for a pressure control breath type that’s flow limited, pressure cycled. I’ve never seen or heard of such a thing.

@@RespiratoryReview im just looking at my class notes and it has a picture of two types of pressure control waveforms. one of them is described as flow limited pressure cycled; which is why I ask. so im not sure . so is pressure control only time cycled flow limited? and wouldn't pressure control be pressure limited since its controlling pressure?

It's not so much that it is a poor way to wean patients. It used to be used a lot more for weaning (a little before my time) - and I know there's some clinicians out there that have had success with it. It's more that there are better ways to wean nowadays like PSV, and a mode called proportional assist ventilation (PAV) to give a couple of examples. These give the patient more control over their ventilation than SIMV, and balance the work done by the ventilator with the work done by the patient a little better, which is really important when weaning.