The authors report an 8-dog series, in wrich they substitute a part of the infra-renal abdominal aorta by a knitted Dacron prosthesis, protecting the proximal anastomosis with a sheath of the prosthesis. The technical difficulties are discussed, and comparative histologic studies are performed of the healing process in both anastomosis. It is concluded that the sheath does not protect from immediate postoperative bleeding due to a defective suture, and that, besides an initial delay of the healing process, it does not create differences in the subsequent evolution of both anastomosis, so that it does not appear to have significanceon the possible occurrence of complications.

Se presenta una serie cl,e 8 perros, en los que se sustituye un segmento de aorta infrarrenal por prótesis Knitted Dacron, protegiendo la anastomosis proximal, con un manguito de la misma. Se analizan las dificultades técnicas y se efectúan estudios histológicos comparativos de la forma de incorporación de la prótesis en ambas anastomosis. Se concluye gue el manguito no proteje ele la hemorra.gia postoperatoria inmediata por sutura defectuosa, y que aparte de un retardo inicial del proceso de incorporación,no crea diferencias en la evolución ulterior de ambas anastomosis, que tengan significación sobre la posible aparición de complicaciones.