Table 1 Comparison between hypoxemia and non-hypoxemia groups
From: Nomogram for the prediction of postoperative hypoxemia in patients with acute aortic dissection
|  | Total (n = 211) | Non-hypoxemia (n = 168) | Hypoxemia (n = 43) | p |
|---|---|---|---|---|
Demographics | ||||
 Age, median (IQR) (years) | 50 (43,63) | 50 (42,64) | 52 (46.5,59) | 0.654 |
 Male, n (%) | 151 (0.72) | 116 (0.69) | 35 (0.81) | 0.158 |
 Height, median (IQR) (cm) | 170 (163,174) | 170 (162.75,174) | 169 (165,174) | 0.647 |
 Weight, median (IQR) (kg) | 70 (62,80) | 70 (60,80) | 80 (65,89.5) | 0.005 |
 BMI, mean ± SD (kg/m2) | 25.32 ± 3.92 | 24.94 ± 3.86 | 26.82 ± 3.84 | 0.006 |
 Smoking history, n (%) | 59 (28) | 47 (28) | 12 (28) | 0.998 |
 Hypertension, n (%) | 134 (64) | 102 (61) | 32 (74) | 0.137 |
 Diabetes, n (%) | 13 (6) | 11 (7) | 2 (5) | 0.998 |
 Stanford A, n (%) | 133 (63) | 97 (0.58) | 36 (84) | 0.003 |
 Emergency admission, n (%) | 188 (89) | 145 (86) | 43 (1) | 0.005 |
Laboratory tests before operation | ||||
 Albumin, mean ± SD (mg/l) | 36.6 ± 4.65 | 36.75 ± 4.76 | 36 ± 4.22 | 0.316 |
 Hematocrit, mean ± SD (%) | 36.09 ± 5.71 | 36.26 ± 5.4 | 35.41 ± 6.82 | 0.452 |
 pH, median (IQR) | 7.37 (7.34,7.4) | 7.37 (7.34,7.4) | 7.37 (7.32,7.38) | 0.205 |
 Lactate, median (IQR) (mmol/l) | 2.1 (1.5,2.9) | 2.05 (1.48,2.8) | 2.30 (1.9,3.1) | 0.082 |
 PaCO2, median (IQR) (mmHg) | 41 (37.55,45.55) | 41 (37.88,45.23) | 40.9 (36.5,47.7) | 0.916 |
 P/F ratio, median (IQR) | 235 (176,355) | 249 (183.75,367.25) | 174 (148.5237) | < 0.001 |
 Scr, median (IQR) (mmol/l) | 81 (64,113) | 76.5 (61,104) | 103 (77.5145) | < 0.001 |
 Total bilirubin, median (IQR) (mmol/l) | 13.7 (10,22.25) | 13.2 (9.57,18.9) | 16.7 (11.9,25) | 0.016 |
 WBC, median (IQR) (^109/l) | 9.5 (7.4,12.6) | 8.9 (6.8,11.65) | 12.9 (9.3,15.5) | < 0.001 |
 CRP, median (IQR) (mg/l) | 28.3 (5.75,68.75) | 23.4 (4.57,60.38) | 58.9 (10.6118.3) | 0.003 |
 Troponin, median (IQR) (ng/ml) | 0.01 (0.01,0.01) | 0.01 (0.01,0.01) | 0.01 (0.01,0.12) | 0.028 |
 CK, median (IQR) (U/l) | 78 (51,150.5) | 72 (48.75,136.25) | 109 (62,228) | 0.023 |
 CKMB, median (IQR) (U/l) | 10 (8,16) | 10 (8,16) | 10 (6.5,14.5) | 0.249 |
 LDH, median (IQR) (U/l) | 218 (171,283) | 208.5 (165,274.25) | 253 (196.5312.5) | 0.013 |
 AST, median (IQR) (U/l) | 22 (16.5,34.5) | 21 (15,31.25) | 31 (18.5,44.5) | 0.007 |
Intraoperative variables | ||||
 Aortic clamping time, mean ± SD (min) | 127.91 ± 40.82 | 128.84 ± 40.7 | 124.26 ± 41.59 | 0.519 |
 CBP time, median (IQR) (min) | 178 (140,211) | 180 (146.75,210) | 169 (132.5221) | 0.749 |
 Duration of operation, median (IQR) min | 295 (120,390) | 285 (90,390) | 300 (242.5420) | 0.072 |
 Minimum temperature, median (IQR) (°C) | 36.2 (35.6,36.55) | 36.2 (35.4,36.6) | 36.3 (36,36.5) | 0.250 |
 Input, median (IQR) (ml) | 6250 (5150,7587.5) | 6090 (5150,7332.5) | 6380 (4775,8170) | 0.651 |
 Output, median (IQR) (ml) | 4850 (3600,5800) | 4900 (3575,6000) | 4500 (3675,5600) | 0.358 |
Clinical outcomes | ||||
 LOS in ICU, median (IQR) (days) | 7 (4,12) | 7 (4,11) | 10 (5.5,14) | 0.079 |
 LOS in hospital, median (IQR) (days) | 19 (13,24.5) | 19 (13,25) | 18 (12.5,24) | 0.775 |
 Duration of MV, median (IQR) (hours) | 15 (5,82) | 12 (3.75,70.25) | 41 (10.5140) | 0.002 |
 Mortality, n (%) | 7 (3) | 6 (4) | 1 (2) | 0.997 |