Obstruction of the Mesenteric Arteries. 393 



Grimme, B. t. W., 1892, 194.— Guenon, Bull., 1905, 122.— Guerrini, O. M., 1908, 434 

 (Lit. on iiitestin. sareonia). — Giiittard, Pr. vet., 1901, 441. — Hendrickx, Ann., 1909, 

 377.— Kater, A. f. Tk., 1887, XIII, 365.— Lasserre, Eev. vet., 1906, 292.— De Meis 

 and Parascaniiolo, A. f. Tk., 1904, XIX, 583.— v. Ow., B. Mt., 1880, 79.— Plosz & 

 Marek, Z. f. Tni., 1904, VIII, 257.— Poss, Z. f. Vk., 1899, 495.— Reichart, Z. f. Vk., 

 382.— Eost, S. B., 1881, 60.— Eupp, B. t. W., 1906, 44.— Schimniel, O. M., 1905, 57. 

 —Schmidt, S. B., 1903, 310.— Sikorski, O., Eev., 1886, 175.— Thienie, Pr. Mt., 1868-69, 

 174.— Wyssmann, Schw. A., 1907, XLIX, 261.— Ziirn, B. t. W., 1904, 289. 



23. Obstruction of the Mesenteric Arteries. Thrombosis et 

 emtaolia arteriarum mesenterialium. 



{Verstopfimg der Gekrosarterien; Tliromhutisch-emhoUsclie 

 Kolih [German]; Congestion intestinale [French].) 



Thrombosis of the mesenteric vessels is due, as a rule, 

 to inflammation and obstruction, caused by sclerostoma larvae; 

 it occurs in this connection only in horses, and leads often to 

 frequent temporary attacks of colic. 



Many French authors classify intestinal disturbances due to throm- 

 bosis and embolism with "Congestion intestinale," to which also belong 

 catarrhal and inflammatory conditions (see page 337). This cannot be 

 approved, since it throws very heterologous affections together under 

 one head. 



Historical. Larvje of sclerostomum were first seen in the mesenteric 

 arteries by Ruysch in 1665 and similar observations were then made by 

 several other authors. The causal connection between these parasites 

 and attacks of colic has since the beginning of the last century been 

 pointed out by several authors, especially by Rigot, Schutt, Hering, Rey- 

 nal, Bruckmiiller, Prehr and others. Bollinger (1870) made systematic 

 examinations of this pathologic condition. Modern investigations of 

 verminous aneurysm of the horse have more recently been made by 

 Sticker (1901), Glage (1905), Adelmann (1908). Disturbances of the 

 circulation of the blood and of the functions of the intestines following 

 thrombosis of the mesenteric arteries have been studied by Marek 

 (1907). 



Occurrence. Bollinger's investigations, which have been 

 confirmed by other authors, have shown that 90 to 94% of all 

 horses with the exception of foals have a verminous aneurysm. 

 However, the statement of this author must be considered as 

 entirely unjustified, that one-half of all fatal cases of colic are 

 caused by thrombosis or aneurysm and that all cases in which 

 colic appears suddenly and without any apparent cause are due 

 to this condition. More recent observations (Matthiesen, 

 Franke, Schultze, Poppel, Glage) prove that the disease also 

 occurs in foals from the third month on. Poppel, indeed, lias 

 seen, in a foal ten days old, a dilatation of the anterior mesen- 

 teric artery as large as a pigeon's egg, and in it a thrombus 

 containing larvfc of sclerostomum. 



Verminous aneurysm appears to be more common in foals than is usually 

 assumed. Among thirty-five slaughtered foals, from five to several months old. 



