Hydrops was found in lingual surface mocosa of epiglottis in all these patients and abscess of epiglottis developed in 2,and laryngemphraxis in 1 and tracheotomy was carried out.
You'll notice that all of these causes of lymphedema are the result of some other disease, so these are situations that represent secondary lymphedema.
Likewise, mild hypocapnia might be beneficial treatment as a temporary measure when treating cerebral edema, but hyperventilation could cause cerebral vasoconstriction.