Measurement of dead space - Fowler's and Bohr's equation | pulmonary function tests physiology

[@rajeevkaparthi190]

Many teachers share their knowledge, few of them focus on concept, but you are the only teacher who not only teaches the concept but also making us understand the concept. Thank you so much madam.

[@PhysiologyOpen]

Thank you so much and most welcome…I am glad that what I am trying is reaching to the people

[@Dr..........]

Your explanation is amazing 😍. I have wasted whole day reading it in book. Thank you so much

[@PhysiologyOpen]

Most welcome…do share with others

[@shaeikhsiraj]

Ma'am your explanation was super smooth.It helped me a lot

[@PhysiologyOpen]

Great

[@HansikaAmaraweera]

Ma'am since we have our 2nd mbbs exam in this April, one of our lecturer recommended your channel for physiology, that's how I met your channel, great explanation in particular concepts ,thank you ,keep it up ,helpful

[@PhysiologyOpen]

Oh thanks…which college are you in?

[@HansikaAmaraweera]

@@PhysiologyOpen faculty of medicine, University of Jaffna in Sri Lanka

[@PhysiologyOpen]

Wow I’m SriLanka…great to know

[@HansikaAmaraweera]

😊​@@PhysiologyOpen

[@kentaha]

so to calculate the alveolar dead space, we use the fowler method to get the anatomical one and also bohr's equation to have the total dead space

[@PhysiologyOpen]

Yes

[@PhysiologyOpen]

Bohrs equation more important

[@remasudheer695]

I understood very well thank u so much mam🙏🙏

[@PhysiologyOpen]

Most welcome

[@rajeevkaparthi190]

Good morning madam. I have a doubt. In the graph , you showed first phase is only till some part of trachea, why can't it be till the terminal Broncheole, till where no gas exchange occurs? My doubt is when deadspace gas is mixing with alveolar gas, that means gas exchnage has happened, then why should we consider part of that phase as dead space? Kindly reply. No text book is helping me, i am expecting you to clarify my doubt. Thank you.

[@PhysiologyOpen]

Actually it’s till terminal bronchiole…that’s right..gas exchange - the term is used for diffusion of gases at respiratory membrane …not the mixing of air…so the gas at alveolar air is the atmospheric air mixed with gases already present in dead space and then finally alveoli…so all this determines po2 at alveolar level

[@rajeevkaparthi190]

Thank you madam I have understood to some extent that the volume of that upstroke belongs to both deadspace and alveoli as at that particular portion of air passages both gases were simply mixed.(no gas exchange happened). To determine an end point of deadspace it was divided equally. I hope I have understood it in a right way. Please correct me if I am wrong.

[@PhysiologyOpen]

Right

[@single2002]

Mam what is alpha effect in adrenal medulla?

[@PhysiologyOpen]

alpha effect ? you mean effect of hormones on alpha receptors?

[@single2002]

@@PhysiologyOpen yes mam, i read by your notes and not getting what it is?

[@Vijayalakshmi-to1ei]

Thank you mam its very clear

[@PhysiologyOpen]

Most welcome

[@zqr444]

Mam there is more ventilation at Apex right

[@PhysiologyOpen]

No …at base

[@zqr444]

@@PhysiologyOpen U mean at supine position

[@PhysiologyOpen]

Supine position - it is expected to be same …but I am talking in standing too…ventilation as well as perfusion are more at base

[@zqr444]

@@PhysiologyOpen Mam actually the ventilation is more at Apex that is how I red in gk pal

[@PhysiologyOpen]

Just look at ventilation perfusion graph, you will see both decrease from base to apex but perfusion decreases much more. Ventilation perfusion ratoi is more at apex not ventilation. If you have read it somewhere either read it again to clarify your concept.. or if it is really written in any book its written wrong

[@JohnDoe-fz5db]

THANK YOU

[@PhysiologyOpen]

Most welcome- do like and share

[@Ashiisagar]

😢thankyouuuuuu❤❤❤❤

[@PhysiologyOpen]

Most welcome

[@rubanu7066]

❤🙏😊

[@PhysiologyOpen]

😊