INFLAMMATION OF THE LUNGS 49 



Etiology. — Anything which greatly increases air pressure 

 in the alveoli. Violent coughing fits to dislodge foreign 

 bodies, medicine, etc., which have' gotten into the bronchi. 

 It rarely accompanies acute catarrhal and croupous bron- 

 chitis. Violent contractions of ( the abdominal muscles 

 (hard pulling, retching, continued bellowing in cattle). 

 Violent struggles to get free from hobbles, or if a horse is • 

 cast in the stall and makes vigorous efforts to free itself. 



Symptoms. — Sudden dyspnea which may rapidly lead to 

 suffocation. Emphysema of the skin (in ox) of the aperture 

 of the chest, shoulders, and side of thorax. It may involve 

 the whole trunk. Percussion ' is practically normal. On 

 auscultation crackling sounds, rales. 



Course. — Usually fatal in twentyrfour to thirty-six hours. 

 Healing only in less acute cases. 



Diagnosis. — Unless subcutaneous emphysema develop, 

 may be impossible. Can easily be confused with pulmonary 

 congestion and edema. The history is helpful. , 



Treatment. — Allay cough. Scarify skin. 



INFLAMMATION OF THE LUNGS. 



Pneumonia. Pneumonitis. 



The following clinical forms of pneumonia may be distin- 

 guished : 



Fibrinous. 

 Catarrhal. 

 Foreign body. 

 ' "Metastatic. 

 Interstitial. 

 Fibrinous Pneumonia (Lung Fever, Croupous Pneumonia). 

 —Definition. — An inflammation of the lung characterized 

 by its typical course, and the formation of fibrinous coagulse 

 in the alveoli of the invaded area. It affects the lobe rather 

 than the lobule. 



Etiology. — The existence of fibrinous pneumonia as a 

 primary disease in animals is open to question. At any 

 rate it has not been proven. 

 4 



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