Concerning the Trans-pulmonary pressure.

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Offline Chivalrous

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Concerning the Trans-pulmonary pressure.
« on: 31/03/2015 17:44:35 »
I've read that: "Trans-pulmonary pressure is the difference between the intra-alveolar pressure and the intra-pleural pressure in the lungs."

I'll be very grateful if anyone could please explain that in more details.
(Note: I've read about the intra-alveolar and the intra-pleural pressures, but I still can't understand how the trans-pulmonary pressure can be the difference between them.)

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Offline cheryl j

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Re: Concerning the Trans-pulmonary pressure.
« Reply #1 on: 01/04/2015 01:39:27 »
It might help to google transpulmonary pressure under google images and look at some diagrams. You understand that when when you breath in, the diaphragm and rib muscles expand the the size of the thoracic cavity?  The pleural membrane is a double membrane with one layer tightly adhering to the walls of the chest cavity, with a small space between it and the second layer around the lungs. When the thoracic cavity expands, the pressure inside the lungs decreases, drawing in air. When inhaling, the pressure will begin decreasing in the pleural space first, and hold for a while at slightly more negative.   (If I'm stating the obvious, I apologize.)
« Last Edit: 01/04/2015 16:19:36 by cheryl j »

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Offline cheryl j

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Re: Concerning the Trans-pulmonary pressure.
« Reply #2 on: 01/04/2015 01:46:43 »
another diagram
« Last Edit: 01/04/2015 01:49:18 by cheryl j »

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Offline evan_au

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Re: Concerning the Trans-pulmonary pressure.
« Reply #3 on: 01/04/2015 10:23:01 »
That's pretty impressive - our normal breathing works at around 0.3% of an atmosphere pressure!

I'm sure our lungs can produce more pressure than that, for example, when blowing up a balloon...

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Offline alancalverd

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Re: Concerning the Trans-pulmonary pressure.
« Reply #4 on: 01/04/2015 19:43:42 »
Maximum exhalatory pressure is about 60 - 90 cm water gauge. One atmosphere is about 10 m water gauge. 
helping to stem the tide of ignorance

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Offline Chivalrous

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Re: Concerning the Trans-pulmonary pressure.
« Reply #5 on: 01/04/2015 21:31:36 »
cheryl j, Thanks a lot for your help, your second diagram was very useful. I got it! [:D]
evan_au & alancalverd, Thanks for your replies.