Table 1 Baseline characteristics of the study
Variables | Overall | NT-proBNP (pg/mL) | Â |
|---|---|---|---|
|  |  | Low level (< 165) | High level (≥ 165) |
n | 629 | 314 | 315 |
Age, mean (SD), y | 63.5 ± 15.3 | 58.5 ± 14.9 | 68.5 ± 14.1 |
Male (%) | 432 (68.7) | 207 (65.9) | 225 (71.4) |
BMI, mean (SD) | 23.2 ± 5.1 | 23.0 ± 4.0 | 23.3 ± 5.9 |
Medical history | |||
 Hypertension (%) | 590 (93.8) | 297 (94.6) | 293 (93.0) |
 Diabetes mellitus (%) | 564 (89.7) | 282 (89.8) | 282 (89.5) |
 Coronary artery disease (%) | 129 (20.5) | 43 (13.7) | 66 (21.0) |
 Abnormal liver function (%) | 2 (0.3) | 1 (0.3) | 1 (0.3) |
 Heart failure (%) | 2 (0.3) | 0 | 2 (0.6) |
 Endoscopic surgery (%) | 161 (25.6) | 95 (30.3) | 66 (21.0) |
Pre-operative laboratory findings | |||
 Hemoglobin, median (IQR), g/L | 119 (96 to 139) | 124 (102 to 143) | 113 (91 to 132) |
 Urea, median (IQR), mmol/L | 5.9 (4.7 to 8.0) | 6.0 (5.0, 7.0) | 6.0 (5.0, 9.0) |
 Creatinine, median (IQR), μmol/L | 72.0 (62.0, 87.0) | 71.0 (61.0 to 84.3) | 76.0 (63.0 to 93.0) |
 NT-proBNP, median (IQR), pg/ml | 165.0 (62.3 to 428.5) | 62.3 (35.1 to 106.0) | 428.1 (256.7 to 730.3) |
 Serum albumin, median (IQR), g/L | 38.0 (32.8 to 41.8) | 39.7 (34.9 to 43.1) | 35.8 (31.4 to 40.2) |
Intraoperative information | |||
ASA physical status score | |||
 I (%) | 5 (0.8) | 4 (1.3) | 1 (0.3) |
 II (%) | 276 (43.9) | 183 (58.3) | 93 (29.5) |
 III (%) | 336 (53.4) | 124 (39.5) | 212 (67.3) |
 IV (%) | 12 (1.9) | 3 (1.0) | 9 (2.9) |
Duration of surgery, median (IQR), hour | 2.8 (2.0 to 3.9) | 2.9 (2.0 to 3.8) | 2.8 (1.9 to 4.0) |
Preoperative systolic blood pressure, median (IQR), mmHg | 123 (110 to 138) | 121 (109 to 134) | 125 (112 to 140) |
Preoperative diastolic blood pressure, median (IQR), mmHg | 70 (62 to 78) | 71 (63 to 78) | 70 (62 to 78) |
Diuretics (%) |  3 (0.5) |  3 (1.0) |  0 |
NSAIDs (%) |  614 (97.6) |  303 (96.5) |  311 (98.7) |
Antibiotics (%) |  627 (99.7) |  314 (100.0) |  313 (99.4) |
Total volume infusion, median (IQR), ml | 2800 (2100 to 3650) | 2700 (2075 to 3600) | 2800 (2100 to 3700) |
Estimated blood loss, median (IQR), ml | 50 (20 to 100) | 50 (20 to 100) | 50 (20 to 100) |
Urine output, median (IQR), mL | 400 (200 to 700) | 300 (200 to 700) | 400 (200 to 700) |
Postoperative information | |||
 Postoperative NSAIDS (%) | 439 (69.8) | 228 (72.6) | 211 (67.0) |
Postoperative infections | |||
 AKI (%) | 112 (17.8) | 46 (14.6) | 66 (21.0) |