Pseudo-membranous bronchitis is rarely met with. In making this statement I exclude the persistence of a diphtheritic bronchitis and croupous pneumonia, in both of which diseases the expulsion of false membranes may occur. It is, perhaps, not always easy to make an absolutely correct differential diagnosis of these cases. This difficulty rests upon the fact that (i) membranous inflammation of the bronchii of an acute character, such as diphtheria, may become chronic. I have seen several such cases, but in all of them the acute stage had been well marked, and the chronic condition seemed to be only delayed convalesence. (2) Croupous pneumonia may certainly become chronic, but so far as my own experience enables me to judge, the membranous exudate, if present, disappears with the acute stage.
The literature of the subject is quite voluminous in titles, as may be seen by reference to the index catalogue of the
JOHNSON HA. A CASE OF CHRONIC PSEUDO-MEMBRANOUS BRONCHITIS.. JAMA. 1887;VIII(3):60–63. doi:10.1001/jama.1887.02391280004002
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