[Termino-lateral anastomosis of the carotid of the rat. Histological evaluation of permeability in relation to the number of suture stitches and the thread used].

A histological study of end-to-side anastomosis on the carotid arteries of the rat, is presented comparing the results according to the type of suture material and the number of stitches. Two groups of 5 animals were studied. Group "A" in which the 11-0 monofilament nylon (18 microns; needle of 70 microns) was utilized with an average of 11 stitches; and group "B" corresponding to the 10-0 nylon (25 microns; needle of 100 microns) with an average of 8 stitches. The patency of the anastomosis was ascertain in all cases except one where a complete thrombosis of the donor artery was discovered. The fact that there were no difference between both groups is stressed. Other findings were: dehiscence, 3; invagination, 3; partial thrombosis, 4 in spite of actual patency. It was concluded that the 10-0 nylon is easier to handle, and 8 stitches are enough to perform and end-to-side anastomosis in 1mm diameter arteries. A regular distance among the stitches and a balanced tension of knotting are important to prevent or to diminish the risk of dehiscence, first range factor of occlusive thrombosis.