Dyspnoea Laryngea. Roaring. Hemiplegia Laryngea. 145 



case is reported by Dupuy in which a course of arsenic cured. In 

 these cases as well as in those due to ulceration of the membrane 

 the application of caustic by means of a staff and sponge as ad- 

 vised in laryngitis may prove beneficial.. In some cases of this 

 kind the application of the firing iron to the region of the larynx 

 has an excellent effect. Setons have proved useful in some cases. 



In cases due to tumors or enlarged glands pressing on the air 

 passages the internal use of iodine and other alteratives and di- 

 uretics, and the local applications of iodine, or rnercurial ointments 

 or of blisters have been successful. Failing in this the tumors 

 may be removed with the knife when accessible. 



If by auscultation the existence and position of a band of lymph 

 can be made out, tracheotomy may be performed and the band ex- 

 cised. Percivall with reason doubts the possibility of the diag- 

 nosis. 



In cases due to distortion of the larynx from tight reining the 

 bearing reins should be dispensed with or rearranged so as to en- 

 courage protrusion of the nose, and the horse should be bitted to 

 the side chains or straps in the stall several hours daily so that 

 the head shall be elevated and the nose protruded. 



When roaring depends on paralysis of the laryngeal muscles, a 

 mode of palliation may be adopted as practised by the I/Ondon 

 omnibus and cab men. A strap is fixed round the nose supported 

 by a strap passing down the middle of the face and the cheek 

 piece of the bridle on each side and buckled beneath the chin. 

 On the inner side of this strap where it passes over the false nos- 

 trils is attached on each side a semiovoid pad which presses on 

 the flap of the nostril and regulates the entrance of air. The 

 principle on which it acts will be understood when we consider 

 that the paralyzed cartilage is drawn into the passage by the rush 

 of air and that the closure of the channel is more complete and 

 the roaring more marked in proportion to the force of the current. 

 The pads by lessening and regulating the rush of air into the lungs 

 thus leave the passage in reality more open and largely obviate 

 the difficulty of breathing and the noise. 



In extreme cases with the structural lesion in the head, throat, 

 or upper two-thirds of the neck relief may be secured by trache- 

 otomy. 



A more radical operation is that introduced by Giinther for the 

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