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Table 4 Errors of ion concentrations in proportioned dialysate for the two types of dialysis machines at different time points

From: In vivo and in vitro performance of a China-made hemodialysis machine: a multi-center prospective controlled study

Test time

Ion (mmol/L)

Actual error (ml)

SWS-4000

Fresenius 4008

Week 1

K+

0.12 ± 0.10

0.09 ± 0.10

Na+

1.40 ± 1.74

1.45 ± 1.37

Cl

1.40 ± 1.40

1.35 ± 0.94

Ga2+

0.06 ± 0.05

0.04 ± 0.05

HCO3

1.69 ± 1.73

1.45 ± 0.91

Week 4

K+

0.11 ± 0.10

0.11 ± 0.11

Na+

1.89 ± 1.80

2.65 ± 3.07

Cl

2.06 ± 2.20

2.43 ± 2.04

Ga2+

0.06 ± 0.05

0.05 ± 0.05

HCO3

1.54 ± 1.45

1.96 ± 1.82

Week 8

K+

0.09 ± 0.10

0.13 ± 0.11

Na+

1.37 ± 1.53

1.95 ± 1.18

Cl

1.55 ± 1.97

1.84 ± 0.87

Ga2+

0.11 ± 0.11

0.05 ± 0.05

HCO3

2.06 ± 1.41

1.29 ± 1.25

Week 12

K+

0.10 ± 0.11

0.10 ± 0.10

Na+

1.93 ± 1.43

1.70 ± 1.63

Cl

2.05 ± 1.70

1.23 ± 1.03

Ga2+

0.05 ± 0.05

0.03 ± 0.03

HCO3

1.70 ± 1.92

1.14 ± 0.89

Week 16

K+

0.10 ± 0.11

0.13 ± 0.11

Na+

3.08 ± 1.74

2.26 ± 1.73

Cl

1.98 ± 1.91

1.60 ± 1.18

Ga2+

0.08 ± 0.09

0.06 ± 0.06

HCO3

1.24 ± 0.90

1.15 ± 1.58

Week 20

K+

0.17 ± 0.15

0.15 ± 0.16

Na+

2.04 ± 1.33

1.88 ± 1.51

Cl

3.05 ± 2.66

1.66 ± 1.77

Ga2+

0.07 ± 0.06

0.03 ± 0.04

HCO3

2.36 ± 1.85

2.04 ± 2.69

Week 24

K+

0.13 ± 0.10

0.16 ± 0.24

Na+

3.20 ± 2.64

2.03 ± 2.42

Cl

1.93 ± 2.22

2.25 ± 1.91

Ga2+

0.10 ± 0.07

0.06 ± 0.05

HCO3

1.61 ± 1.78

2.52 ± 2.48