. Modern surgery, general and operative. contact by a band or ligature donot unite. The arterial surfaces under the band atrophy because they aredeprived of blood. The arterial wall dies, and necrotic tissue is organized orsubstituted, blood-vessels entering both ends. Absorption of the necrotic wallis proceeding during the vascularization. If an artery be occluded partially by a band it may develop a circumscribeddilatation distal to the seat of constriction. This will not happen if the arterybe either very slightly or completely occluded. A like condition may developin the subclavian in a ca
. Modern surgery, general and operative. contact by a band or ligature donot unite. The arterial surfaces under the band atrophy because they aredeprived of blood. The arterial wall dies, and necrotic tissue is organized orsubstituted, blood-vessels entering both ends. Absorption of the necrotic wallis proceeding during the vascularization. If an artery be occluded partially by a band it may develop a circumscribeddilatation distal to the seat of constriction. This will not happen if the arterybe either very slightly or completely occluded. A like condition may developin the subclavian in a case of cervical rib. Halsted ( Jour. Exper. Med.,Sept., 1916) studied the reports of 716 cases of cervical rib and found that in27 or more of them dilatation existed. Animals tolerate gradual occlusion verywell indeed. Halsted has made numerous experiments on dogs and has used the band withencouraging results on the human being (partial occlusion of the innominate,twice; common carotid, four times). In a case of aneurysm of the abdominal. Fig. 227.—Halsteds improved band roller: The instrument shown in full length is unloaded;in the abbreviated cut the band is about to be expelled from the roller (Halsted). aorta Halsted partially occluded the aorta near the diaphragm. Seven-teen days later he placed another band on the aorta below the patient lived twenty-four days after the second operation. The operationchecked the growth of the aneurysm and arrested pain (Trans. Am. , 1909-10). In another case of abdominal aneurysm Halsted put a bandon the aorta above the renals. Seventeen days later Finney inserted wire intothe aneurysm. The patient lived forty-five days after the first operation (Ibid.). In preparing the band for application it is rolled by means of the instru-ment shown in Fig. 227. It is well to fasten the band with a silver ligatureafter application. The ligature prevents unrolling (Ibid.). Treatment After Operation for Aneurysm.—After operati
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