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Table 2 Data on the surgical operations depending on a high or low fluid retention index (FRI) prior to anaesthesia induction

From: Preoperative fluid retention increases blood loss during major open abdominal surgery

Parameter FRI < 3.5 (n = 61) FRI ≥ 3.5 (n = 36) Statistics
Preoperatively
 Age (years) 65 (57–72) 67 (50–73) P = 0.59
 Body weight (kg) 75 (68–89) 75 (60–85) P = 0.42
 ASA class I/II/III (%)a 28/59/13 38/52/8 P = 0.48
 B-Hb concentration (g/l) 126 (118–134) 127 (120–135) P = 0.61
 U-albumin/creatinine (mg/mmol) 1.87 (1.15–5.04) 1.02 (0.65–1.83) P < 0.002
 Preoperative fluid experiment (n, %)a 19 (31%) 11 (31%) P = 0.30
During surgery
 Operating time (h) 2.3 (1.4–4.1) 3.3 (2.2–4.2) P = 0.07
 Blood loss (ml) 200 (75–413) 450 (150–738) P < 0.01
 Blood loss/operating time (ml/h) 87 (41–154) 123 (74–225) P < 0.03
 Erythrocyte transfusion (N patient) 4 5  
 Erythrocytes transfused (ml) 863 (552–1408) 1389 (313–1670) P = 0.62
 B-Hb concentration (g/l) 106 (93–112) 104 (95–115) P = 0.76
 Urine (ml) 245 (171–500) 350 (149–500) P = 0.95
 Urine/operating time (ml/h) 92 (62–174) 96 (48–143) P = 0.34
 Crystalloid fluid (ml) 1081 (688–1430) 1279 (954–1950) P = 0.05
 Colloid fluid (ml) 1000 (700–1400) 1430 (953–1956) P < 0.04
 Infused fluid volume (ml) 2140 (1567–2816) 2594 (2248–3461) P < 0.02
 Fluid balance (ml) + 1506 (1210–2041) + 1913 (1439–2403) P < 0.02
 Fluid balance, blood equivalents (ml) + 954 (729–1401) + 1235 (979–1494) P < 0.03
Postoperatively
 ∆ S-troponin T, day 0 vs. 1–2 (%)b, c + 20 (0–66) 0 (− 6 to + 8) P < 0.02
 ∆ S-NT-proBNP, day 0 vs. 1–2 (%)b, c + 161 (31–357) + 150 (41–462) P = 0.43
 B-Hb concentration (g/l) 113 (102–122) 114 (104–124) P = 0.74
 Length of hospital stay (days) 7 (5–11) 9 (6–14) P = 0.15
  1. Mann-Whitney’s test was used for statistics
  2. a contingency table analysis
  3. bRepeated-measures ANOVA based on log-transformed data
  4. cThe means of the values on days 1 and 2 were compared with the preoperative value