sameeralord
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As title suggest. Thanks 

Through lack of oxygen in the blood I believe! Skin and mucous membranes begin to look bluish!sameeralord said:As title suggest. Thanks![]()
sameeralord said:Thanks for the reply but I think people with ashtma have less problem in inhaltion, but more problem in exhalation. So it is the resultant increase in carbon dioxide shifting the hameoglobin dissociation curve to the right that causes this. I posted this topic to clarify?
thorium1010 said:No asthma has problem with inhalation also (due to narrowing of bronchi). So there is hypoxia which is why there is cyanosis.
This is not correct . Asthmatics , during an attack of asthma are hypoxic (depending on severity).mtc1973 said:Incidentally asthmatics are generally not oxygen limited - it is a sign of severe ER requiring asthma if you see a change in blood PO2.
Again - most asthmatics are not hypoxic. This is a severe life threatening situation when an astrhmatic does develop low PO2.
mtc1973 said:There are more problems associated with exhalation but of course if bronchial muscle tone is high then inhalation rates will also be slowed. But the additional exhalational effects come from the relationship between lung volume and airway diamater.
Incidentally asthmatics are generally not oxygen limited - it is a sign of severe ER requiring asthma if you see a change in blood PO2.
Again - most asthmatics are not hypoxic. This is a severe life threatening situation when an astrhmatic does develop low PO2.
thorium1010 said:This is not correct . Asthmatics , during an attack of asthma are hypoxic (read oxygen saturation).
nismaratwork said:I think you need to do 2 things.
1.) Consider what is meant by hypoxia in this thread, given that it's in the context of cyanosis.
2.) Tell me if you understand that "PO2" is "oxygen saturation"... pulse oxygen, "pulse ox", that little cute red light thing they put on your finger? Yeah, the "Pulse Oximeter".
thorium1010 said:Po2 is partial pressure of oxygen.
oxygen saturation is the not same and yes its read by a pulse oximeter.
i would like to clarify that cyanosis develops only in severe life threatening cases of asthma or acute severe asthma
thorium1010 said:mtc said:Incidentally asthmatics are generally not oxygen limited - it is a sign of severe ER requiring asthma if you see a change in blood PO2.
Again - most asthmatics are not hypoxic. This is a severe life threatening situation when an astrhmatic does develop low PO2.
This is not correct . Asthmatics , during an attack of asthma are hypoxic (depending on severity).
most of the cases are mild to moderate form and are usually reversible by drugs