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Stent patency of patients who underwent regular stent exchange, n (%)
| Group A (n = 35) | Group B (n = 35) | P value | |
| Stent-exchange schedule | 6 mo | 12 mo | |
| Stent patency at scheduled time | 32 (91.4) | 31 (88.6) | NS |
| Stent exchange prior to schedule | 3 (8.6) | 4 (11.4) | NS |
| Details of stent troubles | |||
| Stent occlusion | 1 (2.9) | 3 (8.6) | < 0.05 |
| Stent migration | 2 (5.7) | 1 (2.9) | NS |
| Acute cholangitis | 1 (2.9) | 3 (8.6) | < 0.05 |
| Biliary-related mortality | 0 | 0 | NA |
NS: Not significant; NA: Not available.
