"Equal pressure point" in the respiratory system
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- Опубліковано 25 чер 2024
- What is the concept of equal pressure point? Where does it occur in healthy individuals? What happens to it in COPD patients? How do the COPD patients overcome it? Watch the video for the answers.
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Amazing explanation . I looked everywhere but you explained it so easily. Could not understand from the book . Thank you !!
Thanks for the comment!
What an explanation! Excellent!
This is the best explanation .Amazing ! Thank you
Thank you very much for this structured explanation of the EPP!
Great video sir keep making these
Thanks for explanation! Very helpful!
So thankful for this wonderful explanation 🥺🥺
Best explanation...thankyu very much sir
I loved the explanation. Thank you sir..
thank you very much for thisss
Thank you very much! There's just one thing I don't understand. You say that people with COPD exhale slowly to avoid too rapid a drop in airway pressure. But this seems to imply that with a faster flow we can reach a pressure of 0 (atmospheric) before reaching the mouth. And that the air could therefore stagnate (for lack of a gradient) before reaching the mouth.
No. That won’t happen. Alveolar pressure (P1) is positive (say, + 20 for forceful expiration). And atmospheric pressure (P2) is zero. Air flows from P1 to P2. So, howsoever one breathes, pressure won’t become zero within the airways.
Absolutely great - I will show my students this. Thx
Kim Petersen Thanks! Shall try to record and upload more & more videos, with greater frequency.
Also, please let me know, if any point needs a further discussion.
Regards,
Excellent explanation sir.. I was searchng for this topic for ma finl dnb respi xam preprtn.. 🙏🏻🙏🏻🙏🏻thnku sir
Such a lucid explanation...Thank you so much😊
Thanks,
Regards,
You are awesome. Many thanks to you
Thanks for the comment...!
Nicely explained sir...👌👌
What is the physiology of EPP during huffing?how it helps to remove secreations from the lung.you told about slow expiration will help the patient to achieve epp gradually but what is the mechanism of huffing in which the patient expires forcefully?
Kindly share us the reference text books for this concept
Sir is there symphate afferent parasymphatetic afferent ....if yes is it mylinated ....sensation from visera are carried by autonomic or sensory nerve . If..autonomic nerve will carry .but they relay in lateral or dorsal root ganglion and will they too have 1st 2nd 3rd ordor neuron..
There are somatic sensory nerves emerging from the viscera. These fibers will carry the somatic sensations (like, pain). There are autonomic afferent fibers (mainly parasympathetic), which too carry some of the sensations. E.g., distension of the viscera. In some cases, sympathetic fibers carry pain sensations (like, from bladder). The autonomic fibers go via different routes, to carry the signals to some thalamic nuclei and reticular formation in brain stem.
sir. does intrplueral pressure in any way affect the equal pressure point.?
Yes , it does. The intrapleural pressure determines how much will be the recoil force (pressure) would be there on the lungs. And that, in turn, would determine where the EPP would occur. In short, it's not a very fixed point; it does shift. (Though in normal individuals, it stays in the cartilagenous airways.)
In COPD there is removal of secretions how does this relate to the equal pressure point
COPDs are associated with drying up of secretions, and consequent formation of mucus plugs that would cause further narrowing/blockade of airways. Pressure will be dissipated faster, during expiration, in an attempt to dislodge the mucus plugs. Result would be the same; shift of EPP downstream (to the lower or smaller airways).
Why intra alveolar pressure is positive . What generates the interstitial pressure?
anangsha datta Intra alveolar pressure has to be positive at the start of expiration. Reason - At the start of expiration, thoracic cage starts recoiling inward. It compresses the alveoli, and hence alveolar pressure rises above zero (i.e., it becomes positive). With quiet breathing, it may be just + 1 cm H2O. With the start of forceful expiration, it may be +20 or +30 cm H2O.
Atmospheric pressure is zero. Alveolar pressure HAS TO BE above that (more than zero, or positive) if air has to flow from alveoli to the atmosphere (during expiration).
The transpulmonary pressure acting on the tissue architecture generates the interstitial pressure.
Closing volume??? Sir
Yes. Closing volume (and closing capacity) is discussed in some other video.
excuse me, why is it that the equal pressure point shifts downwards into the smaller airway passages in the COPD patient?
In COPD patients, there is narrowing of airways. Breathing pattern is altered, with more of forceful exhalation. Hence, dissipation of pressure too is different. Hence, EPP shifts. (It’s the dissipation of pressure head, during the airflow, that determines the EPP.)
What is copd
Bronchitis
Emphysema
In which increases in compliance due to decrease in elastic tissu
@@Nitish-tu2cm Chronic bronchitis and emphysema both are under the category of COPD.
In emphysema there is destruction of the elastic tissue (due to increasing residual volume), resulting in an increased compliance.
Kindly share us the reference text books for this concept
Berne & Levy (6th edition) has explained this concept well.