Table 2.
Colonoscopy procedural data
| Variable | WE group (n = 86) | CO2 group (n = 86) | P value |
|---|---|---|---|
| First-pass insertion time, mean (SD), minutes | 8.65 (3.01) | 6.18 (4.59) | < 0.0001 |
| First-pass withdrawal time, mean (SD), minutes | 17.85 (7.71) | 21.00 (7.50) | 0.007 |
| First-pass total procedure time, mean (SD), minutes | 26.51 (8.52) | 27.18 (8.56) | 0.605 |
| Second-pass insertion time, mean (SD), minutes | 3.33 (1.66) | 3.92 (2.42) | 0.062 |
| Second-pass withdrawal time, mean (SD), minutes | 9.06 (2.91) | 10.44 (3.37) | 0.005 |
| Second-pass total procedure time, mean (SD), minutes | 12.39 (3.43) | 14.36 (4.38) | 0.001 |
| Boston Bowel Preparation Scale scorea, mean (SD) | 7.4 (0.7) | 7.0 (0.5) | < 0.0001 |
| Water infused during insertiona, mean (SD), mL | 1513.8 (510.5) | 43.0 (79.7) | < 0.0001 |
| Water aspirated during insertiona, mean (SD), mL | 1341.3 (437.0) | 122.7 (108.8) | < 0.0001 |
| Aspirated as percent of infused during insertiona, mean (SD), % | 89.3 (9.5) | NA | NA |
| Water infused during withdrawala, mean (SD), mL | 261.5 (387.1) | 587.9 (341.0) | < 0.0001 |
| Water aspirated during withdrawala, mean (SD), mL | 358.2 (332.8) | 556.0 (297.9) | < 0.0001 |
| Need for position changea, n (%) | 48 (55.8) | 45 (52.3) | 0.760 |
| Need for abdominal compressiona, n (%) | 52 (60.5) | 74 (86.0) | 0.0002 |
| In patients undergoing colonoscopy only, n (%) | 57 (66.3) | 53 (61.6) | 0.634 |
| Fentanyl dose during first-pass examination, mean (SD), ug | 73.9 (16.9) | 72.4 (13.6) | 0.610 |
| Midazolam dose during first-pass examination, mean (SD), mg | 4.25 (1.13) | 4.53 (1.14) | 0.209 |
| Total fentanyl dose during first- and second-pass examinations, mean (SD), ug | 82.5 (17.1) | 79.3 (16.5) | 0.335 |
| Total midazolam dose during first- and second-pass examinations, mean (SD), mg | 4.69 (1.11) | 4.89 (1.23) | 0.388 |
a Data were referred to first-pass examination only
Abbreviation: WE Water exchange, SD standard deviation, NA not applicable