Alveolar-Arterial Gradient | (A-a) Gradient | Respiratory Physiology & Pathology..Pulmonary Medicine
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- เผยแพร่เมื่อ 30 ส.ค. 2019
- The A-a gradient…Alveolar-arterial gradient is the difference between the partial pressure of oxygen in the alveoli (PAO2) and the partial pressure of the oxygen gas in the arterial blood (PaO2)…This A-a gradient can help differentiate between intrinsic restrictive lung disease and extrinsic restrictive lung disease.
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15:20 when he says answers are in the next video, what video? I looked in "Ventillation/Perfusion Ration" and didn't see anything
Thank you for making it easier.
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thank you for the video but I can't find the answers to the questions in final section, they were not in your next video.
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Can you pin answer for the question that you asked at last
Kindly give referneces of this charts ? Books?
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Thank you for the video! In class, we were told that raising oxygen fraction increases the A-a gradient. Would you be able to explain that please?
Can you give me an example?
@@MedicosisPerfectionalis This might be due to diffusion limitation along the alveolar capillaries.
Yess that is only true when you have high VQ mismatch or even shunting.. Due to diffusion problem.. That’s why it’s more important to give high PEEP than fio2.. when their a shunting, increasing FIO2 will only increase PAO2 but little or no effect on PaO2 causing your A-a griedient to be in the 30’s
Hi! Thanks for the video where can i find the answer?
In the next video in the Pulmonology playlist
Please solve my doubt
We say that in case of vq defect the aa gradient increase
But how does that occur in case of ventilation block
I mean when ventilation is zero, there is no air reaching the alveoli for getting exchanged with the blood so the arterial blood po2 (i.e “a” of the Aa gradient drop)
But if the ventilation is zero, then there is no air reaching the alveoli and then shouldn’t also the alveoli po2 (i.e “A” of Aa gradient also decrease as there is no incoming oxygen)?
And if both A and a are decreasing, then how come (A-a) is increasing
Can someone please post the next video link ty
@medicosis perfectionalis
They are presented in order in the pulmonology playlist.
i thought P Aco2=P aco2..? How can P Aco2 equal Paco2/0.8 in this equation???
What will happen to the gradient in emphysema
Widened A-a gradient.
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The 2 formular for A-a gradient don't match up.
What do you mean?
Medicosis Perfectionalis when I used 0.3 x age and when I use age/4+4 it’s different results. Eg. Assuming pt is 22, using 0.3 x 22=7.3, but when I do 22/4+4 it turns out to be 9.5.
They are not supposed to match exactly.
Go with the agex0.3 that’s what everyone uses
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i didnt understand anything you said
is an increased dead space also a kind of V/Q mismatch? Also ARDS? But they don’t response to 100% oxygen // what does it mean by V/Q mismatch response to 100% oxygen? Thank you in advance
Watch my video on hypoxia.
Usually VQ mismatch responses to O2.. when VQ mismatch is extremely low is call Dead space which doesn’t respond to oxygen unless you resolve the perfusion (obstruction) problem.. when VQ mismatch is severely high, it call Shunting and shunting doesn’t respond to oxygen either. So that’s why we use high PEEP to help with that.. I hope this help.. I wish I could explain it better but I’m only an ICU nurse
@@tijanitunkara2553 Zero VQ is shunting
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