Table 3 Comparison of water injection results between normal ultrasound and ENBD saline-injection ultrasound
Routine ultrasound | ENBD Injection ultrasound | P value | ||
|---|---|---|---|---|
Common bile duct | Length (mm) | 38.05 ± 1.87 | 62.62 ± 1.17 | 0.048 |
Diameter (mm) | 6.959 ± 0.258 | 10.366 ± 0.369 | 0.034 | |
Imaging degree of common bile duct | without imaging of Whole bile duct | 87(28.8%) | 7(2.3%) | < 0.001 |
without imaging of upper part | 71(23.5%) | 7(2.3%) | < 0.001 | |
without imaging of lower part | 136(45.0%) | 15(4.9%) | < 0.001 | |
True positive individual | 12 | 46 | < 0.001 | |
True negative individual | 250 | 247 | 0.249 | |
False positive individual | 1 | 4 | 0.249 | |
False negative individual | 39 | 5 | < 0.001 | |
Specificity | 99.6% | 98.4% | 0.249 | |
Sensitivity | 23.5% | 90.1% | < 0.001 | |
False positiverate | 0.4% | 1.6% | 0.249 | |
False negative rate | 76.5% | 9.9% | < 0.001 | |
Estimated accuracy | 86.7% | 96.4% | < 0.001 |