Preoperative measurement (baseline) Mean (SD) Day of operation Mean (SD) POD 1 Mean (SD) POD 2 Mean (SD) POD 3 Mean (SD) POD 4 Mean (SD) POD 5 Mean (SD)
S – sodium* mmol/l
Placebo
Nutrition

138 (2.8)
139 (2.0)

140 (3.3)
141 (3.2)

138 (3.4)
140 (2.8)

134 (2.5)
138 (2.7)

135 (2.6)
137 (3.5)

136 (3.6)
137 (3.8)

136 (3.4)
137 (2.9)
S – potassium* mmol/l
Placebo
Nutrition

4.02 (0.36)
4.07 (0.50)

3.36 (0.43)
3.35 (0.41)

4.01 (0.41)
3.81 (0.41)

4.02 (0.28)
3.63 (0.44)

3.99 (0.28)
3.67 (0.38)

4.07 (0.52)
3.75 (0.50)

3.98 (0.55)
3.85 (0.46)
Input sodium§ mmol/day
Placebo
Nutrition



898 (241)
923 (283)

233 (141)
158 (133)

125 (107)
150 (108)

62 (88)
101 (108)

42 (83)
72 (130)

69 (124)
29 (76)
Input potassium* mmol/day
Placebo
Nutrition


7.7 (19.1)
27.7 (14.0)

27.8 (28.2)
48.6 (25.3)

16.3 (23.1)
49.7 (26.8)

8.1 (17.8)
41.2 (31.2)

0.9 (4.7)
30.5 (28.4)

2.6 (10.3)
14.2 (26.8)
*p<0.005; §p<0.05 (repeated measures multivariate test (Pillai’s trace))
p<0.05; p<0.005; p<0.0005 comparison between groups
Table 4: S-sodium and s-potassium and daily supply of colloids.