Occlusive effect of metallic stents on canine ureters |
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Authors: | Kenneth C Wright PhD Richard L Dobben Charles Magal Kenji Ogawa Sidney Wallace Cesare Gianturco |
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Institution: | (1) Department of Diagnostic Radiology, The University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Blvd., Box 57, 77030 Houston, TX, USA;(2) Present address: Department of Radiology, University of Illinois, 60602 Chicago, IL, USA;(3) Present address: Department of Radiology, The Memorial Hospital and Medical Center, 21502 Cumberland, MD, USA;(4) Present address: Department of Diagnostic Radiology, Keio University Hospital, 35 Sh'nanomachi, Shinjuku-ku, 160 Tokyo, Japan |
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Abstract: | A three-part study, with successive modifications based on preceding results, was conducted to evaluate ureteral placement
of metallic stents. Gianturco self-expanding (10 mm and 4 mm diameter) and balloon-expanded (4 mm diameter) metallic stents
were placed in normal and stenotic canine ureters. No migration or ureteral perforation occurred during the follow-up of 10
mm stents. Varying degrees of hydronephrosis and hydroureter were found on all 1-week pyelograms. At 4 weeks, complete occlusion
of the stented ureter was noted in all cases because of mucosal hyperplasia around the stent wires. To prevent this reaction,
4 mm self-expanding stents constructed of smaller wire that was uncoated or coated with either Teflon or polyurethane were
tested in five dogs. In all cases, results were similar to those obtained with the larger prostheses. Finally, 4 mm balloon-expanded
stents were placed in a normal ureter of three dogs. In one dog, the stent migrated out of the ureter. No migration or ureteral
perforation occurred in the two remaining dogs. In these animals, mucosal hyperplasia and complete ureteral occlusion occurred
6 and 8 weeks after placement. Therefore, ureteral placement of Gianturco self-expanding as well as balloon-expanded metallic
stents leads to occlusion of the ureter instead of maintaining its patency. Stents, therefore, may be useful as ureteral occlusion
devices. |
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Keywords: | Metallic stents ureters |
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