Flow volume loop - Dynamic airway compression | Pulmonary function test physiology | Respiratory

Pulmonary function test Physiology lecture on respiratory system physiology - Flow volume loop/curve- physiological and in obstructive and restrictive diseases.
Understand the concept of peak flow rate with dynamic flow limitation causing dynamic compression airways in flow volume loop
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[@anjeelathapa3918]

Every video that I have been through is so concise and explained well! Lots of thanx!

[@PhysiologyOpen]

Thank you. You made my day

[@rajeevkaparthi190]

Mind blowing.... Physics and logic... Physiologic. Thank you so much madam. You are making medicine more and more interesting. This channel is really underrated.

[@PhysiologyOpen]

Thanks a lot

[@HansikaAmaraweera]

Physiology is always interesting when you explain the concept correctly, you are a very good teacher ma'am

[@PhysiologyOpen]

Thank you so much

[@xyz-sq6ho]

dynamic compression in the specifically respiratory bronchiole as well as terminal bronchiole also due the the expiratory muscle actions during forceful expiration..so both decrease elastic recoil effect and expiratory muscle... isn't it?..btw love the way u explain those dynamic narrowing..❤

[@queenbird5687]

You are wonderful mam

[@PhysiologyOpen]

Thanks 😊

[@kaushikgupta5674]

Really helped me alot to understand ths concept... Thank you so much ma'am

[@PhysiologyOpen]

It's my pleasure

[@sigmundholmes4005]

Thank you so much ma'am. Was Scratching head while Reading JB West respiratory physiology before watching this.

[@PhysiologyOpen]

Yeahhh...this concept requires West..and Harrison..my reference books...glad you liked it. Do share

[@DrAlex18]

Awesome explanation in lucid language.✨✨

[@PhysiologyOpen]

Thanks. Glad you liked it

[@nathgoody5905]

Thanks Mam, extremely helpful

[@PhysiologyOpen]

So glad. Do share with your friends

[@shailkumarjain]

Thank you. One clarification please. At 9.26 you said narrowing of airway will decrease the velocity. It should not as of consideration mentioned. Firstly since flow rate is taken or considered constant by you, if we take a single airway for understanding, if area of it is reduced, the flow velocity has to increase to maintain flow rate. Beside for a streamline flow, velocity x area (continuity theorem of flow) is considered constant. Flow of gases in large brochi is more or less streamline. Friction will also not eat much velocity either in large brochi and dissipate it as heat. Main cause is exhaling force generated per unit time by a human body will be high initially and it will reach max and then fall with time so rate of flow of exhalation takes same pattern.

[@PhysiologyOpen]

Narrowing of airway increases resistance to flow, leading to loss of pressure head - hence will tend to decrease velocity...however as you rightly said- decreased cross sectional area will lead to increase in velocity

[@shailkumarjain]

@@PhysiologyOpen thank you for reply. Further putting my point, narrowing of brochi leads to lower cross sectional area. Narrowing itself means reduction in radii of airways and radii reduction leads to reduction of cross sectional area.

[@PhysiologyOpen]

Yeah as I said before you are correct there- narrowing leads to reduced cross sectional area...however if there is extensive branching - then overall combined together- it may have higher cross sectional area than unbranched larger diameter bronchi

[@shailkumarjain]

@@PhysiologyOpen at 9.26 as of my original comment, it was considering upper respiratory tract, having larger airway, and same is as per the diagram by you as visible in the video so i commented as per that. Rest is clear. Thanks and Regards 🙏

[@rinkyyadav9168]

I have the same confusion. If velocity is decreasing due to decrease in pressure head then it should also increase due to decrease in area. Is it that the decrease in pressure head is much more than the decrease in area that the velocity finally decreases?

[@bablisharma7198]

Why in graph TLC and RV is more when we go towards left side

[@vinirastogi2167]

Too good

[@PhysiologyOpen]

Thank you

[@varunmenon6350]

How is the cross sectional area more in small branches and less in large airway? shouldn't it be the opposite? I understand that the TOTAL cross sectional area will be more, but when comparing single bronchiole to a main bronchus, shouldn't the velocity be higher in bronchiole since the area is less compared to the main bronchus?

[@PhysiologyOpen]

Total small branches cross sectional area is more and hence velocity less…since air has to cross more cross sectional area in same time.

[@sharansingh8940]

Mam please teach reasons of decorticate and decerbrate rigidity

[@PhysiologyOpen]

Ok will do

[@karthikeyan7372]

Nice

[@PhysiologyOpen]

So nice of nice

[@shaziafarooq7804]

Mam how lung volume remains same till the expiratory air flow reaches the peak

[@PhysiologyOpen]

It doesn’t remain same, it decreases