D 



SECTION VI 

 CIRCULATORY ORGANS 



ISEASES of the circulatory organs may be of 

 common occurrence in swine, but such dis- 

 turbances are rarely recognized clinically. 



HEART 



Pericarditis 



Pericarditis, both acute and chronic, fibrinous and 

 purulent, occurs in relation with hog cholera, swine plague, 

 and erysipelas, and more rarely as a primary condition. 

 The conditions have been observed in autopsies. The 

 acute type is characterized by hyperemia, hemorrhage, 

 and exudation upon the serous lining of the pericardium. 

 The serous surface of the pericardium will have lost its 

 luster and the exudate may adhere to it in shreds. The 

 pericardium becomes thickened in chronic pericarditis, 

 due to the formation of fibrous tissue. 



Hemorrhage 



Hemorrhages of small size are frequently found in 

 the heart muscle. These occur in infectious diseases and 

 are the result of bacterial emboli or injury of the capillaries 

 by chemic substances incidental to infection. They are 

 of significance to the meat inspector and the diagnostician. 



Subendocardial hemorrhages are common as a sequel 

 of infectious diseases. They are of diagnostic value and 

 are an indication to the meat inspector of some infective 

 disease or septic intoxication. 



Fatty Changes 



Fatty changes in the heart muscle occur in practically 

 all swine that have been fattened for market. The fat 

 particles are found between the muscle cells at first, but 



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