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Comparative Evaluation Of Polyvinyl Tube And Cephalic Vein As Ureteral Substitutes In The Dog

By: Bilal Qasim | Dr. Mazhar Iqbal.
Contributor(s): DR. Asim Aslam | Dr. M. Arif Khan | Faculty of Veterinary Sciences.
Material type: materialTypeLabelBookPublisher: 1998Subject(s): Department of Clinical Medicine & SurgeryDDC classification: 0554,T Dissertation note: Ureteral prosthesis was the procedure adopted for the conduit of urine in the most natural way either by introducing synthetic graft, autograft or both at different ureters. In this project 21 healthy dogs of either sex were used. Laparotomy was performed under aseptic precautions on eighteen dogs with the remaining three as control animals. In group A an eight centimeter piece of left ureter was removed from its mid portion. One end of the selected polyvinyl tube was introduced into the lumen of the renal portion of the ureter in a telescoping fashion upto a distance of 0.5 cm and firmly secured with modified matress sutures using 4/0 prolene. Other end of the tube was secured in cystic portion of the ureter in the same manner. In group B, 8 cm segment of right ureter was removed in the same manner as described for group A, but in this group instead of Polyvinyl tube an 8cm cephalic vein graft, harvested from one of the forelimbs was used as a ureteral substitute. A 12 cm small diameter polyvinyl tube was passed through the lumen of the graft such that both the ends of the tube protruded beyon The protruding ends of the tube were passed into the renal and cystic segments of the ureter. This was done to stabilize the graft and proper approximation of the cut ends of the ureteral segments and the graft for suturing. The respective ends of the ureteral segments and the graft were sutured with horizontal mattress everting sutures using 4/0 prolene. Then a small nick was given in the renal ureteral segment to remove the tube. The nick was repaired with one horizontal mattress suture using the same suture material. In group C polyvinyl tube and cephalic vein were grafted in the left and right ureters respectively as described for group A and B. All the survivor dogs were kept under observation for 3 weeks and evaluated on clinical observations, biochemical studies and intravenous urography. Euthanasia was performed after the experimental period and operative sites were explored and gross changes were recorded. The analysis of the results clearly indicated that the use of polyvinyl tube was a better option over cephalic vein for the ureteral prosthesis.
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Veterinary Science 0554,T (Browse shelf) Available 0554,T
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Ureteral prosthesis was the procedure adopted for the conduit of urine in the most natural way either by introducing synthetic graft, autograft or both at different ureters.

In this project 21 healthy dogs of either sex were used. Laparotomy was performed under aseptic precautions on eighteen dogs with the remaining three as control animals.

In group A an eight centimeter piece of left ureter was removed from its mid portion. One end of the selected polyvinyl tube was introduced into the lumen of the renal portion of the ureter in a telescoping fashion upto a distance of 0.5 cm and firmly secured with modified matress sutures using 4/0 prolene. Other end of the tube was secured in cystic portion of the ureter in the same manner.

In group B, 8 cm segment of right ureter was removed in the same manner as described for group A, but in this group instead of Polyvinyl tube an 8cm cephalic vein graft, harvested from one of the forelimbs was used as a ureteral substitute. A 12 cm small diameter polyvinyl tube was passed through the lumen of the graft such that both the ends of the tube protruded beyon The protruding ends of the tube were passed into the renal and cystic segments of the ureter. This was done to stabilize the graft and proper approximation of the cut ends of the ureteral segments and the graft for suturing. The respective ends of the ureteral segments and the graft were sutured with horizontal mattress everting sutures using 4/0 prolene. Then a small nick was given in the renal ureteral segment to remove the tube. The nick was repaired with one horizontal mattress suture using the same suture material.

In group C polyvinyl tube and cephalic vein were grafted in the left and right ureters respectively as described for group A and B.

All the survivor dogs were kept under observation for 3 weeks and evaluated on clinical observations, biochemical studies and intravenous urography. Euthanasia was performed after the experimental period and operative sites were explored and gross changes were recorded.

The analysis of the results clearly indicated that the use of polyvinyl tube was a better option over cephalic vein for the ureteral prosthesis.

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