DISEASES OP THE ORGANS OF CIRCULATION 73 



The most important vasodilators are amyl nitrite, sodium nitrite, 

 nitroglycerin, morphine, chloroform, chloral hydrate, potassimn 

 bromide, alcohol, ether, some of the ethereal oils; also heat and 

 powerful cutaneous irritants. 



The practical use of the vasodilators is very limited in veteri- 

 nary medicine. They are prescribed, for instance, in cerebral 

 anaemia (syncope), and also in some brain diseases which are attrib- 

 uted to a circumscribed vascular spasm in the brain, as in eclamp- 

 sia and epilepsy. They are recommended in nervous asthma of 

 the dog (nitroglycerin). In human medicine, the vasodilators 

 are also prescribed in spasm of the coronary arteries of the heart 

 designated as angina pectoris. 



Drugs. — 1. Amylis nitris. Amyl nitrite. May be given 

 experimentally in eclampsia of suckling bitches; also by inhalation 

 in asthma. [Dose for dogs, 0.03-0.2; tt^1/3 to iij.] 



2. Nitroglycerin. The same. [Dose of spiritus glycerylis 

 nitratis, formerly spiritus glonoini, for dogs, 0.06-0.13, tti^j to ij.] 



3. Sodii nitris. The same. Dose for dogs, 0.1-1, grs. iss to xv. 

 For other drugs, see the chapter on sedative neurotics. 



IV. General Therapeutics of the Exudates and Transu- 

 dates. Resorbents 



Pathology. — The diseased conditions in which the resorbents 

 are indicated are solid and fluid inflammatory exudates, blood 

 extravasations, transudates, cedemas in the body cavities and 

 tissues, and inflammatory swellings and thickenings of the skin, 

 subcutis, tendons, tendon sheaths, muscle, periosteum, bones and 

 lymph glands. Hyperplasia of the thyroids (goitre) and of the 

 lymph glands, actinomycosis, sediments, poisons and obesity are 

 also treated with resorbents. On the other hand, true neoplasms, 

 as carcinomas, sarcomas, lipomas and fibromas, cannot be removed 

 with resorbents. 



Physiology. — ^The removal of collections of pathological fluids 

 and of other pathological products from the organs and tissues 

 results from the operation of the physiological processes concerned 

 in the normal resorption of lymph and parenchjnnatous fluids. 



