Table 1.
Baseline and Perioperative Characteristics of the Included Patients
| Normocapnia (n=38) | Hypercapnia (n= 40) | P values | |
|---|---|---|---|
| Age (years) | 69.4 ± 5.2 | 69.1 ± 5.9 | 0.816 |
| Male sex, n (%) | 19 (50.0%) | 27 (67.5%) | 0.116 |
| BMI (kg/m2) | 22.8 ± 2.6 | 22.8 ± 2.4 | 0.978 |
| Education (years) | 6 (0, 9) | 6 (6, 9) | 0.491 |
| ASA physical status, n (%) | 0.115 | ||
| II | 20 (52.6%) | 28 (70.0%) | |
| III | 18 (47.4%) | 12 (30.0%) | |
| Comorbidities | |||
| Hypertension, n (%) | 20 (52.6%) | 25 (62.5%) | 0.378 |
| Diabetes, n (%) | 5 (13.2%) | 5 (12.5%) | 0.931 |
| Heart disease, n (%) | 5 (13.2%) | 3 (7.5%) | 0.653 |
| Respiratory disease, n (%) | 4 (10.5%) | 5 (12.5%) | 1.000 |
| Perioperative characteristics | |||
| PaO2 (mmHg) | 85.0 (77.0, 91.0) | 81.0 (73.6, 87.4) | 0.218 |
| PaCO2 (mmHg) | 39.0 (36.3, 40.2) | 39.4 (36.0, 44.0) | 0.545 |
| pH | 7.43 (7.41, 7.45) | 7.42 (7.41, 7.43) | 0.287 |
| Hb (g/L) | 126 ± 21.3 | 127 ± 18.4 | 0.838 |
| Scr (μmol/L) | 73.8 (68.5, 85.4) | 73.8 (66.3, 90.5) | 0.795 |
| BUN (mmol/L) | 5.08 (4.31, 6.26) | 5.47 (4.56, 6.71) | 0.263 |
| Surgery type, n (%) | 0.549 | ||
| Prostatic resection | 0 (0.0) | 2 (5.0%) | |
| Gastric resection | 4 (10.5%) | 3 (7.5%) | |
| Colorectal resection | 34 (89.5%) | 35 (87.5%) |
Note: Data are presented as the mean ± SD, median (interquartile range), or number of patients (%). P-value as a result of t-test, U Mann–Whitney or χ²-test.
Abbreviations: BMI, body mass index; ASA, American Society of Anesthesiologists; PaO2, partial pressures of oxygen in arterial blood; PaCO2, partial pressures of carbon dioxide in arterial blood; Hb, haemoglobin; Scr, serum creatinine; BUN, blood urea nitrogen.