Atopy and Asthma
Common Side Effects of ACEi
If this happens, patients can be switched onto ARBs.
When the vessels stretch all the way to the edge of the lungs.
Can often be seen in heart failure.
Observe what concentration of methylcholine is needed to cause a 20% drop in FEV1.
<4mg = asthma
4-16mg = indeterminate / mild asthma
>16mg = not asthma
Obstructive Airway Disorder
Less than 70% the expected value for FEV1/FVC
Asthma Diagnostics on Spirometry
Less than 70% FEV1/FVC
Increase of >12% in FEV1 with bronchodilator and >200mL
Can help distinguish interstitial lung disease if it is low.
Evidence of a previous MI.
A pronounced Q-wave with a drop and width of >1 little square.
LABA / ICS
Oxygen Saturation and Asthma
Should show normal oxygen saturation.
Asthma is an expiratory problem, not an inspiratory one. Can't blow off CO2 but O2 can still be dissolved.
Rising CO2 in Asthmatic Patients
This is BAD.
If carbon dioxide starts off low on the ABG and starts to rise without a marked improvement in symptoms, this indicates that the patient is failing therapy and may need to be intubated.
Even if the new CO2 is within the normal range.