Angina Pectoris. Breast Pang. 425, 



Cases have been noted in the horse in connection with obstruc- 

 tion of the coronary artery by sclerostoma equinum (larva) 

 (Cadiot), with a microbian thrombus of the coronary artery fol- 

 lowing tenotomy (Johne), and with rupture of the right coro- 

 nary artery (Rigollat), and in the ox with aneurism of the left 

 coronary artery (Plot). Other cases in horses have been re- 

 corded by Cagny and Butti. 



Symptoms. Coming as it usually does from imperfect blood 

 supply to the walls of the heart, the symptoms are essentially 

 those of heart failure and profound prostration under active 

 exertion or excitement. The animal will suddenly stop work, 

 whinny plaintively, standing stock still, and with a drawn, 

 anxious face, and drooping head. In some cases it is impossible 

 to move him ; in others he may be moved a few steps at a time, 

 with rests of about five minutes each, which bring relief. Aus- 

 cultation detects irregular action of the heart, with the sounds 

 low and indistinct. The pulse is weak, thready and irregular, 

 so that it cannot be certainly counted. Respiration is deep. In 

 some cases the patient suddenly drops to the ground, and may 

 perish or revive. The attacks are paroxysmal, when not fatal, 

 they recur at intervals of a few days up to a year, but tend to 

 greater frequency and finally to sudden death in a paroxysm. 



Treatment. Give chloral by stomach or rectum ; amyle nitrite 

 by inhalation or morphine sub-cutem. 



