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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