Table 2 Intradialytic changes of plasma concentrations of arginine, guanidinoacetate, creatine and creatinine

Arginine

 Predialysis concentration, μmol/L

77 ± 22^***

80 ± 24^***

72 ± 18^***

0.2

 Postdialysis concentration, μmol/L

60 ± 19^***

63 ± 21^***

55 ± 14^***

0.08

 Absolute decrease, μmol/L

17 ± 23^***

17 ± 25^***

16 ± 19^***

0.9

 Proportional decrease, %

18 ± 25^***

17 ± 28^***

20 ± 21^***

0.7

Guanidinoacetate

 Predialysis concentration, μmol/L

1.8 ± 0.6^***

1.9 ± 0.6^***

1.6 ± 0.5

0.1

 Postdialysis concentration, μmol/L

1.0 ± 0.3^***

1.1 ± 0.3^***

0.9 ± 0.4

0.07

 Absolute decrease, μmol/L

0.8 ± 0.4^***

0.8 ± 0.5^***

0.7 ± 0.4^***

0.4

 Proportional decrease, %

40 ± 17^***

38 ± 17^***

43 ± 15^***

0.3

Creatine

 Predialysis concentration, μmol/L

26 [16–41] ^***

19 [15–33] ^*

33 [24–56] ^***

0.01

 Postdialysis concentration, μmol/L

21 [15–30] ^***

20 [15–25] ^*

24 [15–37] ^***

0.01

 Absolute decrease, μmol/L

5 [1–14] ^***

3 [0–8] ^*

10 [3–18] ^***

0.02

 Proportional decrease, %

13 ± 39^*

5 ± 43

27 ± 26^***

0.02

Creatinine

 Predialysis concentration, μmol/L

689 ± 207^***

706 ± 224^***

660 ± 175^***

0.4

 Postdialysis concentration, μmol/L

257 ± 92^***

274 ± 97^***

228 ± 78^***

0.07

 Absolute decrease, μmol/L

432 ± 146^***

432 ± 156^***

432 ± 130^***

0.9

 Proportional decrease, %

63 ± 8^***

61 ± 9^***

65 ± 7^***

0.05