THE SURGICAL TREATMENT OF CHRONIC ROARING. 3 1 



removed the left arytsenoid. She once more went to work at the 

 commencement of May, since when she has continued without inter- 

 ruption. At the present time she occasionally gives a few dry coughs, 

 but no longer roars at a trot. At a very fast pace she produces a 

 slightly abnormal noise, otherwise without importance, for it is not 

 accompanied by any distress or interference with respiration. 



This is not an exceptional case. Since the first results, which I 

 published in i8go, a number of my patients have proved to be cured 

 and others to be improved. During the last few months several 

 animals have returned here, in v/hich after intervals of a year, 

 eighteen months, or two years, the good effects are found to have 

 been maintained. 



These results are interesting, if only from the point of view of the 

 surgery of the larynx. They show that deep, extensive wounds of the 

 larynx readily heal without pulmonary complications, and that intra- 

 laryngeal wounds with loss of substance may cicatrise without pro- 

 ducing contraction of the air-tube. Considering that the condition for 

 which operation is performed was formerly regarded as absolutely 

 incurable they are encouraging, for if failures are still frequent, we 

 now know how to avoid various accidents to which the operation 

 gave rise at the time when I commenced to study it. This is not one 

 of those operations which only became possible after the discovery 

 of antisepsis. The progress effected is simply due to more perfect 

 technique. 



On previous occasions I have spoken of the experiments made 

 more than half a century ago by Gunther with the object of curing 

 roaring. I have also mentioned Moller's researches, of which I gave 

 a resume in my work in i8gi. Among the various methods of opera- 

 tion proposed by these veterinary surgeons is one whose efficacy is 

 undoubted, and which deserves preference before all others. This 

 method is arytsenoidectomy. 



In the great majority of cases I have treated I performed arytanoi- 

 dectomy pure and simple, following the method described in my work* 

 and in my text-book on surgical treatment. I have since somewhat 

 modified the instruments and technique. To ensure not injuring the 

 mucous membrane of the trachea by undue compression, I replace 

 the rubber balloon surrounding the Trendelenburg cannula with 

 plaited gauze, fixed to the tracheotomy tube by ligatures. I only 

 cut through the cricoid cartilage and first ring of the trachea. I 



* See ' Roaring in Horses,' by P. J. Cadiot, translated by T. J. W. Dollar. 



