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. 2017 Mar-Apr;50(2):97-102.
doi: 10.1590/0100-3984.2015.0183.

Percutaneous stent placement for the treatment of malignant biliary obstruction: nitinol versus elgiloy stents

Charles Edouard Zurstrassen  1 , Almir Galvão Vieira Bitencourt  2 , Marcos Duarte Guimaraes  3 , Aline Cristine Barbosa Santos Cavalcante  4 , Chiang Jeng Tyng  2 , Mauricio Kauark Amoedo  2 , João Paulo Kawaoka Matsushita Junior  4 , Janio Szklaruk  5 , Edson Marchiori  6 , Rubens Chojniak  7
Affiliations

Percutaneous stent placement for the treatment of malignant biliary obstruction: nitinol versus elgiloy stents

Charles Edouard Zurstrassen et al. Radiol Bras. 2017 Mar-Apr.

Abstract
in English, Portuguese

Objective: This study aimed to compare two self-expanding stents, a nitinol stent and an elgiloy stent, both placed percutaneously, in terms of their efficacy in palliating inoperable malignant biliary obstruction.

Materials and methods: We retrospectively investigated 99 patients with unresectable malignant biliary obstruction treated with percutaneous placement of a self-expanding metallic stent at our institution between May 2007 and January 2010. Serum bilirubin and liver enzyme levels were measured before and 30 days after stenting. For all procedures using elgiloy or nitinol stents, stent occlusion and patient survival rates were calculated using Kaplan-Meyer analysis.

Results: All of the patients showed clinical improvement after stent placement, with no difference between the two groups. In both groups, the occlusion-free survival rate was 67% at 30 days, 37% at 90 days, 25% at 180 days, and 10% at 360 days, with no significant difference in relation to the type of stent.

Conclusion: The two stents evaluated showed comparable efficacy for the percutaneous treatment of unresectable biliary malignancy, with good clinical results.

Objetivo: Este estudo procurou comparar a eficácia do implante percutâneo do stent autoexpansível de nitinol versus o stent de elgiloy para paliação da obstrução biliar maligna irressecável.

Materiais e métodos: Nós investigamos, retrospectivamente, 99 pacientes com obstrução maligna irressecável tratada com implante percutâneo de stent metálico autoexpansível em nossa instituição, de março de 2007 até janeiro de 2010. Os níveis séricos de bilirrubina e enzimas hepáticas foram medidos antes e 30 dias após o implante do stent. Para os procedimentos em que foi utilizado o stent de elgiloy ou o stent de nitinol, as taxas de oclusão dos stents e as taxas de sobrevida dos pacientes foram calculadas pela análise de Kaplan-Meyer.

Resultados: Os pacientes mostraram melhora clínica após o implante dos stents, sem diferença entre os dois grupos. As taxas de sobrevida livre de oclusão foram 67% aos 30 dias, 37% aos 90 dias, 25% aos 180 dias e 10% aos 360 dias para ambos os grupos, sem diferença significativa em relação ao tipo de stent.

Conclusão: Os dois stents mostraram eficácias comparáveis no tratamento da doença biliar maligna irressecável, com bons resultados clínicos.

Keywords: Biliary tract/pathology; Drainage; Oncology; Radiology, interventional; Stents.

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Figures

Figure 1
Figure 1
Occlusion-free survival curves according to the type of stent used (Kaplan-Meier analysis with log-rank test).
See this image and copyright information in PMC

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