from the classroom to the emergency room, O.R. and beyond. You're joining trauma ICU rounds with your

host, Dr. Dennis Kim. Welcome back to trauma ICU rounds. For those of you joining us for the first time,

I'm your host, Dr. Dennis Kim. I'm an associate professor of clinical surgery at the David Geffen School of Medicine at

UCLA and a trauma surgeon slash intensivist at Harbor UCLA Medical Center in Torrance, California.

I hope that everyone is staying safe and healthy during these trying times.

This week, the stay-at-home order was extended through August here in Los Angeles

County. And I wanted to start the episode today by sending out thanks and shout out to Dr. Adam

Garabay from the Emergency Medicine Residency Program here at Harbor, UCLA.

Adam is a trained hairstylist. And after seeing a picture of two of my four kids' hairs

just absolutely butchered

by my wife Alexis several weeks back. Adam reached out and offered to take care of their hair

and also take care of me. So thank you so much, Adam, for popping by. So today we're going to be

discussing modes of ventilation and follow up to episode three

in which we lay the groundwork or fundamentals for understanding mechanical ventilation.

And as you may recall, we discussed the respiratory equation of motion, which states that

the combined pressure generated by the patient and ventilator, that is, the negative

pressure generated by the muscles of respiration or P muscle,

and the positive pressure delivered by the vent or P vent must be greater than both the

resistive and elastence forces in the lungs and chest wall in order to produce motion or flow

to deliver a volume of gas into the lungs.

Further, we discuss the four phases of a breath and defined a mode of ventilation on the basis of

three key factors or three T's, namely the type of breath, the targeted control variable,

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