Pulmonary Function Tests (PFT): Lesson 3 - Lung Volumes

The methods of measuring lung volumes (e.g. helium dilution, nitrogen washout, body plethysmography), and a discussion of how the total lung capacity affects PFT interpretation, particularly the diagnosis of restrictive lung disease.

[BricksonSchwenn]

I'm grateful for your effective and succinct explanations. I prefer the reliability of your explanations to any amount of graphics or humorous non-sequiturs. You've been a tutor from afar - thank you!

[zulmaikhan]

Boy, you are a star. Thank you and wish you lots of health and wealth and happiness

[exa]

Probably this channel is for medical students but I have to say that I have learned a lot from here.

[alexandrag]

thank you so much!!! incredible how logical things can be explained.More doctors like you are needed.

[amina.khattab]

This is an amazing video, Dr Eric. Thank you for uploading it. I would like to point out a mathematical error regarding FRC. FRC = [(Initial conc. of He - Final conc. of He) / Final conc. of He] - Volume of Reservoir.

[manarnajar]

I can't describe this video because is more than just great. Thank you so much

[dr.md.shalahuddin]

Thanks dr. Eric.
So nice & informative video.

[hollyhermann-sorensen]

I have always wondered whether the lung capacity measured in a living animal would be different from the lung capacity measured in post mortem, ex situ lungs. I see lots of pubs report excised lung volumes but haven't found any that can compare these two measurements. I study marine mammals, which have extremely compliant chest walls and lung volumes, but am curious whether the post mortem ex situ values for lung capacity could be overestimates. Thanks for your help, this video is inspiring (pun intended)! :-)


Another thing I was hoping you could clear up is whether helium dilution or nitrogen washout techniques can be used to estimate total lung capacity...based on this video it seems like they can only be used to measure FRC, but I just wanted to ask in case I misunderstood. Thank you again for making this video, it's great!

[nayabei]

I'm a new NP.  Love your videos.  Very clear.  Helping me study for board certification.  Thank you!!

[beste]

our proffesor using your videos at lectures 😆 amazing

[raleigh]

Dear Dr Strong,

Thanks for the very informative series on pulmonary function tests. Would you consider an additional lecture on interpreting the validity of each of each type of PFT to complete the series.

Thank you.
Sincerely,

Raleigh


[salarkhabat]

thank you very much for these helpful videos.

[rapharenthlei]

Thank you so much!Do keep making more videos. 💕

[priyaacharya]

Amazing-- well thought out and clearly explained lectures which have impacted greatly on my confidence and practice. Thank you from the bottom of my heart. This is an invaluable resource. Any chance of some CSF interpretation or pleural fluid interpretation lectures?

[MrNakedWizard]

I'm struggling with the eqution a bit. I get FRC = (initial concentration x initial volume / end concentration) - initial volume after solving the equation. Looking in some books I can see that the s is apparently correct but that it can be solved further through some likely clever maths? Is there any way of explaining this please?

[davejones]

You sound like the guy out of Friends. Good videos. I can across theses asI have had and still getting my energy from pneumonia / plurisy. Bloody bugs.

[jf]

You have great lectures.  Can you do one on Breath Sounds?

[sammmysam]

Why does He dilution not measure FRC + TV? Wouldn’t the person still be breathing in tidal volume after the stopcock is closed? Confused...

[giuseppevallese]

In pseudorestriction is it possible that FEV1 / FVC is normal? I think yes because FVC is reduced.

[hollyhermann-sorensen]

Using the radiographic technique, how do you separate the lung tissue from the air? Or do you? Are the two considered to be one and the same?