Table 2.
Characteristics of Patients With Various Numbers of Atelectatic Segments
| Characteristic | No. of Segments With Atelectasis per Patient |
P Value | ||
|---|---|---|---|---|
| 0-3 | 4 or 5 | 6-8 | ||
| BMI, mean ± SD, kg/m2 | 25.85 ± 6.44 | 28.41 ± 7.03 | 30.41 ± 5.45 | .0554 |
| Tidal volume, mean ± SD, mL | 430.33 ± 86.86 | 431.82 ± 86 | 441.11 ± 73.24 | .7662 |
| Tidal volume per kg ideal body weight, mean ± SD, mL/kg | 8.98 ± 1.53 | 8.92 ± 1.6 | 9.33 ± 1.22 | .3426 |
| Fio2, mean ± SD, % | 94.31 ± 13.35 | 97.74 ± 6.3 | 98.78 ± 2.92 | .4434 |
| PEEP, mean ± SD, cm H2O | 1.5 ± 2.31 | 0.78 ± 1.28 | 1.17 ± 1.58 | .7020 |
| Time to atelectasis survey, mean ± SD, min | 30.5 ± 15.54 | 36.17 ± 13.94 | 47.22 ± 19.36 | .0095 |
| BMI, No. (%), kg/m2 | .0201 | |||
| < 25 | 10 (62.5) | 11 (47.8) | 3 (16.7) | |
| ≥ 25 | 6 (37.5) | 12 (52.2) | 15 (83.3) | |
| Tidal volume, No. (%), mL | .3570 | |||
| < 400 | 6 (37.5) | 10 (43.5) | 4 (22.2) | |
| ≥ 400 | 10 (62.5) | 13 (56.5) | 14 (77.8) | |
| Fio2, No. (%) | .5903 | |||
| < 100 | 6 (37.5) | 6 (26.1) | 4 (22.2) | |
| 100 | 10 (62.5) | 17 (73.9) | 14 (77.8) | |
| PEEP, No. (%), cm H2O | .8150 | |||
| 0 | 10 (62.5) | 15 (65.2) | 10 (55.6) | |
| ≥ 1 | 6 (37.5) | 8 (34.8) | 8 (44.4) | |
| Time to atelectasis survey, No. (%) | .0820 | |||
| < 33 min | 13 (81.3) | 15 (65.2) | 8 (44.4) | |
| ≥ 33 min | 3 (18.8) | 8 (34.8) | 10 (55.6) | |
See Table 1 legend for expansion of abbreviation.