BACKGROUND: In the endoscopic management of unresectable malignant biliary obstructions, covered metallic stents (CMSs) showed longer patency and lower incidence of stent occlusion than uncovered metallic stents (UMCs). However, there are very few reports on factors influencing the results of inserting CMSs. We evaluated differences in clinical results according to stent type. METHODS: We reviewed the results of four types of CMS (polyurethane-covered Diamond stent (PCD), silicone-covered WALLSTENT (SCW), ComVi stent, and VIABIL biliary stent) and an uncovered MS (UMS), based on our experience and the literature. CMSs were characterized according to the axial and radial forces, covering (partial, full), smoothness of the inner surface, and presence of an anti-migration system. RESULTS: CMSs were patent significantly longer than UMSs. There were differences in stent patency among the CMSs, including the cause of occlusion and other complications. The PCD had good patency and a low incidence of migration. The ComVi stent occluded early due to food impaction, but had the longest median stent patency and a low migration rate. The incidence of migration of SCW was relatively high and the SCW was occluded primarily by sludge. CONCLUSIONS: We should assess the differences between the various CMSs and select the best one for each patient.
BACKGROUND: In the endoscopic management of unresectable malignant biliary obstructions, covered metallic stents (CMSs) showed longer patency and lower incidence of stent occlusion than uncovered metallic stents (UMCs). However, there are very few reports on factors influencing the results of inserting CMSs. We evaluated differences in clinical results according to stent type. METHODS: We reviewed the results of four types of CMS (polyurethane-covered Diamond stent (PCD), silicone-covered WALLSTENT (SCW), ComVi stent, and VIABIL biliary stent) and an uncovered MS (UMS), based on our experience and the literature. CMSs were characterized according to the axial and radial forces, covering (partial, full), smoothness of the inner surface, and presence of an anti-migration system. RESULTS: CMSs were patent significantly longer than UMSs. There were differences in stent patency among the CMSs, including the cause of occlusion and other complications. The PCD had good patency and a low incidence of migration. The ComVi stent occluded early due to food impaction, but had the longest median stent patency and a low migration rate. The incidence of migration of SCW was relatively high and the SCW was occluded primarily by sludge. CONCLUSIONS: We should assess the differences between the various CMSs and select the best one for each patient.
Authors: Tae Jun Song; Yil Sik Hyun; Sang Soo Lee; Do Hyun Park; Dong Wan Seo; Sung Koo Lee; Myung-Hwan Kim Journal: World J Gastroenterol Date: 2012-08-28 Impact factor: 5.742
Authors: Sung Ill Jang; Se Joon Lee; Seok Jeong; Don Haeng Lee; Myung-Hwan Kim; Hong Jin Yoon; Dong Ki Lee Journal: Gut Liver Date: 2017-07-15 Impact factor: 4.519