A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . nd moreacute. Etiology.—The cause is unknown. The distributionis that of chronic bronchitis. The individuals at-tacked are usually those whose resistance has beenlowered by illness or by other causes. No definiteexciting cause has been determined. The incidenceis greater in males. It is uncommon under twelveyears and over forty years of age, but no age isimmune. The mucous form is often associated withasthma. Bacterial investigations have yielded no re-sults as to
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . nd moreacute. Etiology.—The cause is unknown. The distributionis that of chronic bronchitis. The individuals at-tacked are usually those whose resistance has beenlowered by illness or by other causes. No definiteexciting cause has been determined. The incidenceis greater in males. It is uncommon under twelveyears and over forty years of age, but no age isimmune. The mucous form is often associated withasthma. Bacterial investigations have yielded no re-sults as to the causative factor. Intercurrent skindiseases have been noted. 525 Bronchitis REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Pathology.—The caste as ordinarUy seen are firm inconsistency. Occasionally they may be streaked -nithblood. The size varies, the large ones measuring 10cm. in length and showing branching to seven oreight degrees. Section of the larger portion showsthem to be composed of an outer skin enclosing smallerwhirls and cylinders and showing a flattened smaller branches may be solid. Thev are com-. FiG. 1147.—Fibrinous Casts. Photographed by the late from specimens obtained from a case coming under hisown observation. (Three-fifths natural size.) posed usually in large part of mucin with a smallamount of fibrin. The cell content varies; Posseltregarded the true casts as composed mostly of fibrinwith very few cells. These composed of mucin areaccompanied by many cells, mostly mononuclear. Atautopsy the casts are usually found loose in thebronchi. The associated lesions are those of bron-chitis. The organisms isolated have been the strep-tococci, staphylococci, and pneumococci. The struc-ture of the casts suggests that their formation begins
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