Table 3.
Baseline population characteristics
| Variable | Collapsible (CI+) group (N = 20) |
Noncollapsible (CI-) group (N = 63) | P value |
|---|---|---|---|
| Age, years, median (IQR) | 69 (60.5–77) | 61 (51–82) | 0.0066 |
| Male sex, N (%) | 7 (35.0%) | 29 (46.0%) | 0.3858 |
| BMI, kg/m2 | 24.15 ± 3.04 | 26.48 ± 4.94 | 0.0505 |
| ASA 3, N (%) | 9 (45.0%) | 16 (25.4%) | 0.0959 |
| COPD, N (%) | 2 (10.0%) | 7 (11.1%) | 0.9999 |
| Hypertension, N (%) | 14 (70.0%) | 36 (57.1%) | 0.3060 |
| Peripheral arterial disease, N (%) | 3 (15.0%) | 4 (6.4%) | 0.3510 |
| Diabetes, any type, N (%) | 4 (20.0%) | 12 (19.1%) | 0.9999 |
| Preoperative fluid intake, ml (IQR) | 700 (500–1400) | 600 (100–1200) | 0.1438 |
| Baseline systolic pressure, mmHg | 147 ± 16 | 143 ± 17 | 0.3218 |
| IVC diameter in expiration, mm | 17 ± 3 | 18 ± 4 | 0.2031 |
| Propofol dose for induction, mg/kg | 1.77 ± 0.15 | 1.81 ± 0.16 | 0.3756 |
ASA American Society of Anesthesiology, BMI body mass index, COPD chronic obstructive pulmonary disease, IQR interquartile range, IVC inferior vena cava