MAB
Forum Elite
Topics: 20
Posts: 285
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Please If someone could give me straight way to memorize different types of hypoxemia..like 1.PAO2-PaO2 Gradient differences
2.PCO2 levels
3.Improvement after 100% O2...etc..
I always make mistake in all of these....
if some one knows mnemonic for this one that would be great..
thanks guys in advance
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91/84/cs passed,2005 grad,GC,no USCE
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| Eagle_303
Forum Guru
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Posts: 655
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Dear it is easy to remember if you understand a fundamental concept.
Funcitionally we can divide into two type of problems
Ventilation problems in which O2 is not reaching to the end of alveoli no matter what it the reason like :
- - Atmospheric air does not have proper pressure of O2 as in high altitude
- -There is obstruction of airways like Foreign body
- -Chest wall cannot move as in neurmuscular disorder including narcotic intoxication
In Ventilation problems A-a gradient is always normal
Other problems are DIFFUSION probles in which air entering the alveoli is normal but it is not passing onto arterial blood i.e
- - Fluid accumulation between alveli and capillaries i.e pulmonary edema
- -Fibrous tissue accumulation as in interstial fibrosis
- -There is V/Q mismach i.e Blood and Air are not coming in contact with each other
In these conditions A-a Gradiant is increased.
In other words A-a gradient is a Measure of "Diffusion" not of ventilation
So to differentiate between Ventilation defects and diffusion defects ,first step is A-a gradiant .
If
[font style="background-color: #ffffff" color="#0000ff"]Normal = ventilation defect [/font]
[font style="background-color: #ffffff" color="#0000ff"] increased = Diffusion defect.[/font]
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| MAB
Forum Elite
Topics: 20
Posts: 285
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thanks a lot eagle_303,
now I have cleared all my doubts....
thanks and If I get my question right on the exam...its because of you
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91/84/cs passed,2005 grad,GC,no USCE
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| KMG
Forum Newbie
Topics: 2
Posts: 10
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Nice explanation Eagle_303!
I arrange a paper called "O2 Journey"  to understand the causes of hypoxemia, your words make it more easy.
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