Table 1.
Baseline characteristics of the patients.
| Variables | Total (n = 390) | NKP failure group (n = 95) | NKP success group (n = 295) | p-value |
|---|---|---|---|---|
| Median age, years (range) | 72 (21–96) | 72 (27–93) | 71 (21–96) | 0.875 |
| Male, n | 204(52.3%) | 51(53.7%) | 153 (51.9%) | 0.757 |
| Indications of ERCP | ||||
| Choledocholithiasis, n | 220(56.4%) | 56 (58.9%) | 164 (55.6%) | 0.566 |
| Malignant biliary stricture, n | 131(33.6%) | 32 (33.7%) | 99 (33.6%) | 0.982 |
| Benign biliary stricture, n | 23 (5.9%) | 4 (4.2%) | 19 (6.4%) | 0.422 |
| Bile leak, n | 14 (3.6%) | 2 (2.1%) | 12 (4.1%) | 0.371 |
| Sphincter of Oddi dysfunction, n | 2 (0.5%) | 1 (1.1%) | 1 (0.3%) | 0.397 |
| Median CBD diameter, cm (range) | 1.2 (0.4–4.1) | 1.2 (0.4–4.1) | 1.2 (0.4–2.9) | 0.866 |
| Major papilla status | ||||
| Periampullary diverticulum, n | 80 (20.5%) | 27 (28.4%) | 53 (18.0%) | 0.028 |
| Enlarged or swelling, n | 44 (11.3%) | 12 (12.6%) | 32 (10.8%) | 0.633 |
| Impacted stone, n | 13 (3.3%) | 0 (0%) | 13 (4.4%) | 0.037 |
| Tumor, n | 21 (5.4%) | 7 (7.4%) | 14 (4.7%) | 0.325 |
| Low set papilla, n | 14 (3.6%) | 3 (3.2%) | 11 (3.7%) | 0.795 |
| Surgically altered anatomy, n | 34 (8.7%) | 13 (13.7%) | 21 (7.1%) | 0.049 |
CBD common bile duct, NKP needle-knife pre-cut papillotomy, ERCP endoscopic retrograde cholangiopancreatography procedure.