The correlation between intraoperative renal resistive index and cardiac surgery-associated acute kidney injury – A pilot, prospective, observational, single center study

According to the Kidney Disease: Improving Global Outcomes (KDIGO) standard, the patients were divided into AKI group and non-AKI group. [...]74 patients were enrolled in this study. Characteristic AKI (n = 20) Non-AKI(n = 54) Preoperative baseline data Age in years 60.95 ± 7.45 57.70 ± 10.09 Sex(female) 20 (12) 54 (28) BMI(kg/m2) 23.47 ± 2.55 22.58 ± 2.85 LVEF (%) 62.22 ± 5.17 60.02 ± 6.94 Euro Score II(score) 3 (1,5) 4 (2,5) Hypertension, n (%) 10 (50) 17 (31.5) Diabetes, n (%) 5 (25) 6 (11.1) Smoking history, n (%) 7 (35) 14 (23.5) Preoperative Scr (μmol/L) 73.40 ± 21.58 63.46 ± 11.51 Preoperative uric acid (μmol/L) 310.44 ± 115.32 307.88 ± 93.42 Type of surgery Valve surgery, n (%) 9 (45) 27 (50) CABG, n (%) 8 (40) 15 (27.8) CABG+ Valve surgery, n (%) 1 (5) 2 (3.7) Others, n (%) 2 (10) 10 (18.5) Intraoperative variables Surgery time (min) 245(200,380) 235(205,360) Anesthesia time (min) 295(240,425) 280(240,410) Aortic cross-clamping time (min) 88.65 ± 47.30 67.56 ± 43.82 CPB (min) 126.40 ± 59.84 101.11 ± 58.54 Urine volume (ml) Before-CPB 180(145,245) 95(30,287.5) During-CPB 325(200,475) 390(227.5652.5) After-CPB 500(340,700) 525(400,875) Ultrafiltration volume(ml) 525(250,800) 350(200,475) Blood transfusion, n (%) 7* (35) 10 (18.5) Crystal liquid (ml) 1450(1155,1892.5) 1350(1075.51652.5) Colloidal liquid (ml) 755(625.51155) 685(607.5975) Postoperative outcomes Mechanical ventilation time (h) 19.65 ± 3.68 18.49 ± 3.76 ICU LOS (h) 42.74 ± 8.83 38.23 ± 9.52 Hospital LOS (h) 14.25(11,17.25) 12(11,14.5) RRT, n (%) 3* (15) 0 (0) Table 1 Baseline characteristics and clinical outcomes between groups with AKI and without AKI.