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Thank you so much doctor, you've really helped me understand this concept very well. I love all your videos and how you teach. Its feels nice to finally understand things, am a big fan! God bless you
Your video is super amazing! I'm a clinical pharmacy student. We do need to understand these clearly so then we can understand mechanism of drugs, pharmacology etc better! You helped me so much. Thank you!
There are a few very important concepts which are misleading in this video. Restrictive lung diseases are those which ‘restrict’ the lung from expanding, yes - but they do not all involve an decreased lung compliance. Pulmonary edema, ARDS, pneumonia, pleuritis, anterior chest burns, even obesity all restrict lung expansion without involving any change to the lung tissue. Similarly, obstructive lung pathology involves the ‘obstruction’ of gas movement throughout the lung itself, yes - but they do not all involve increased lung compliance. For example, asthma is a reactive airway disease that is characterized by constriction of bronchioles causing air-trapping in the lungs. The lung tissue itself is unchanged, thus the compliance is also unchanged. Moreover, RV is increased for both asthma and emphysema but the underlying mechanisms are very different. As mentioned, asthma involves air trapped in the alveoli which increases the RV (amount of air at end of expiration). This is why you may need to manually decompress the chest of a crashing asthmatic. Emphysema does not involve air trapping but the RV is increased because increased lung compliance allows the chest wall to expand (thus giving the ‘barrel-chest’ appearance) thus expanding the lungs which increases total lung capacity. To say restrictive lung pathologies involve decreased lung compliance or obstructive lung pathologies an increased lung compliance is simply wrong. This video does highlight two examples of Restrictive and Obstructive pathologies but unintentionally oversimplifies and misleads their explanation.
Hi DR. MIke! I couldn't understand why ERV decreases in restrictive diseases? You related it to IRV that it decreases because there is not as much IRV but isn't the ERV- the amount of air you can expire after a normal breath (TV), which you said would be relatively normal. Shouldn't the ERV increase because there is increased elastic recoil in restrictive diseases? Please someone explain this- I am so confused
I was going through my day, learning FEV1/FVC ratio and then these ***arms*** were recommended and I had to click on the video yes this is an elaborate thirst comment- I'm sorry but these pecs don't lie
