120 PRACTICE OF EQUINE MEDICINE. 



What is the causation? 



It may occur as a primary disease or as the result of several 

 acute attacks; or, again, it may be the sequela or an extension of 

 a pharyngitis, or a chronic nasal catarrh, or a bronchitis. 



What are the symptoms ? 



They seem to be altogether local, and consist principally in 

 a hoarse and husky persistent cough, the animal otherwise being 

 apparently healthy; they eat well and seem to feel well. 



If the animal is taken out of a warm stall into the cooler air, 

 he coughs for a time, causing a white mucous discharge. There 

 is some pain on pressure over the larynx, associated with coughing; 

 there is thickening of the mucous membrane, with varicose veins. 



What is the prognosis ? 



This depends on the pathological changes; the prognosis is 

 good as regards life. These cases are often hard to cure, especially 

 in old animals. 



What is the treatment ? 



The treatment should be both constitutional and local, and is 

 about the same as for an acute case. The cough may be quieted 

 by giving sodium bromide, or a solution of morphine, or bella- 

 donna, or cocaine. 



Locally, counter-irritation may be of service; also, astringent 

 gargles. Swabbing out throat with astringent or slight caustic 

 solutions. 



LAEYNGEAL (EDEMA. 



What are the synonyms ? 



CEdematous laryngitis, dropsy of larynx, oedema of the glottis 

 (incorrectly so called). 



Give a definition of this affection. 



It is a term used to indicate the occurrence of a dropsical 

 effusion or an inflammatory exudation into the areolar tissue be- 

 neath the laryngeal membrane. It is really not an oedema of the 

 glottis, but of the upper portion of the larynx. 



What is the pathology? 



The effusion is generally of a serous or sero-purulent character, 

 and is found in the loose cellular tissue beneath the mucous mem- 



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