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CardioVascular and Interventional Radiology
Published in: CardioVascular and Interventional Radiology 9/2019

01-09-2019 | Laboratory Investigation

Balloon-Expandable Biodegradable Stents Versus Self-Expandable Metallic Stents: A Comparison Study of Stent-Induced Tissue Hyperplasia in the Rat Urethra

Authors: Jung-Hoon Park, Tae-Hyung Kim, Young Chul Cho, Nader Bakheet, Seung Ok Lee, Seong-Hun Kim, Kun Yung Kim

Published in: CardioVascular and Interventional Radiology | Issue 9/2019

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Abstract

Purpose

To compare the degrees of stent-induced tissue hyperplasia of balloon-expandable, biodegradable stents (BEBSs) with those of self-expandable metallic stents (SEMSs) in a rat urethral model.

Materials and Methods

A total of 20 rats were randomized into two groups. The BEBS group (n = 10) received a poly-l-lactic acid (PLLA) biodegradable stent. The SEMS group (n = 10) received a nitinol bare stent. All rats were killed eight weeks after stent placement. The degree of stent-induced tissue hyperplasia was assessed by comparing the results of retrograde urethrography and histologic examination between the two groups.

Results

Stent placement was technically successful in all rats. Two rats in the BEBS group were excluded due to procedure-related death. The mean luminal diameter of stented urethra on urethrograms was not significantly different at 4 and 8 weeks between the two groups. On histologic analysis, the percentage of granulation tissue area (p < 0.001) and the thickness of papillary projection (p < 0.001) were significantly higher in the BEBS group compared with the SEMS group. The inflammatory cell infiltration showed a clear tendency to significance (p = 0.050). There were no statistical differences in the number of epithelial layers and the thickness of submucosal fibrosis between the two groups.

Conclusion

Formation of stent-induced tissue hyperplasia was significantly evident in the rat urethra with similar degrees between the BEBS and the SEMS. The BEBS was associated with a thicker papillary projection and larger granulation tissue area resulting from higher inflammation compared with the SEMS.
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Metadata
Title
Balloon-Expandable Biodegradable Stents Versus Self-Expandable Metallic Stents: A Comparison Study of Stent-Induced Tissue Hyperplasia in the Rat Urethra
Authors
Jung-Hoon Park
Tae-Hyung Kim
Young Chul Cho
Nader Bakheet
Seung Ok Lee
Seong-Hun Kim
Kun Yung Kim
Publication date
01-09-2019
Publisher
Springer US
Published in
CardioVascular and Interventional Radiology / Issue 9/2019
Print ISSN: 0174-1551
Electronic ISSN: 1432-086X
DOI
https://doi.org/10.1007/s00270-019-02239-0

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