"344 VETERINARY SURGICAL OPERATIONS 



The vagus fails, the inspired air drives the arytenoids into the 

 laryngeal lumen, the organism cries for more oxygen, the 

 second attempt to inspire carries the arytenoid still farther 

 into the larynx, increasing the obstruction, the demand for 

 oxygen now being great, a third attempt to inspire drags the 

 arytenoid downwards, completing the obstruction, and death 

 ensues. A real spasm, owing to the greater strength of the 

 dilators, would dilate instead of constrict the laryngeal open- 

 ing and glottis. 



Foreign Bodies in the Pharynx. — In the ox foreign bodies 

 in the pharynx may obstruct the larynx and produce a threat- 

 ening dyspnoea demanding tracheotomy, when the removal 

 can not be promptly effected. This condition, choke in its lit- 

 eral sense, is not very common on account of the facility with 

 which such obstruction can be removed. Bradley reports the 

 history of a case in which an ox swallowed a square block of 

 wood that lodged in the pharynx which was removed with 

 some difficulty after the patient's life was saved from suffoca- 

 tion by tracheotomy. Analogous cases may occasionally be 

 encountered. 



Primary Abscess of the Guttural Lymphatic Glands. — 

 (Tuberculosis) (actinomycosis). — Large abscesses some- 

 times develop in the lymphatic glands about the throat in the 

 absence of any pronounced abnormality of the mucous mem- 

 branes. In the horse their cause is obscure ; probably a sim- 

 ple pyogenic infection carried to them from' the nasal mucous 

 membrane explains them. In the ox they are often actinomy- 

 cotic or tuberculous. In certain rar-e instances they en-_ 

 croach upon the air passages to the extent of threatening 

 suffocation. If their contents cannot be evacuated owing to 

 their immaturity or other causes, tracheotomy may be neces- 

 sary to preserve life until their development is complete. 



In certain surgical operations on the larynx and pharynx 

 tracheotomy becomes necessary to preserve the respirations 

 while these organs are being obstructed by the surgical work. 

 These include particularly operations for the cure of roaring 

 and operations on the guttural pouches. Intubation of the 

 trachea in these same operations is also sometimes necessary 

 to protect the flow of b'ood into the lungs. Inflatable tubes 

 which act as tampons are used for this purpose. 



To Irrigate the Bronchial Tract. — Willrams (W. L.) per- 

 forms tracheotomy to irrigate the lungs with antiseptics, to 

 combat inflammatory conditions. The rationale, logical 

 enough, has not been met by a general adoption of this 



