Skip to main content

Table 4 Urinary physicochemical parameters in the course of acute kidney injury (AKI)

From: Physicochemical analysis of blood and urine in the course of acute kidney injury in critically ill patients: a prospective, observational study

  

Day -2 (n = 13)

Day -1 (n = 21)

Day 0 (n = 168)

Day +1 (n = 164)

Day +2 (n = 117)

NaU (mEq/L)

No-AKI

-

-

89 [44,167]

101 [51,143]

137 [95,195]

transient

146 [79,175]

52 [31,127]

54 [22,90]

62 [30,123]

115 [72,180]

persistent

134 [39,175]

116 [48,164]

41 [18,84]

45 [22,88]

58 [23,109]

P

  

*0.00/ **0.09/ ***0.00

0.06/ 0.44/ 0.15

0.00/ 0.01/ 0.55

ClU (mEq/L)

No-AKI

-

-

113 [39,173]

109 [52,163]

125 [95,184]

transient

130 [113,187]

43 [39,170]

56 [23,101]

68 [31,135]

135 [80,191]

persistent

124 [53,177]

126 [47,155]

39 [17,84]

42 [15,97]

60 [22,103]

P

  

0.00/ 0.12/ 0.00

0.00/ 0.21/ 0.07

0.00/ 0.00/ 0.48

KU (mEq/L)

No-AKI

-

-

45 [31,70]

40 [29,53]

33 [23,46]

transient

49 [39,52]

52 [17,88]

36 [25,59]

38 [26,55]

36 [26,48]

persistent

37 [20,54]

41 [30,63]

48 [29,65]

42 [30,64]

37 [24,64]

P

  

0.54/ 0.34/ 0.34

0.61/ 0.34/ 0.50

0.51/ 0.55/ 0.43

NaU/KU ratio

No-AKI

-

-

2.0 [0.7,3.8]

2.6 [0.7,4.2]

4.6 [2.1,7.9]

transient

2.9 [2.8,3.0]

1.2 [0.5,5.5]

1.2 [0.5,2.8]

1.4 [0.5,3.7]

4.2 [1.8,6.0]

persistent

4.5 [1.5,6.0]

2.1 [1.2,4.9]

0.8 [0.4,2.6]

1.2 [0.3,2.7]

1.4 [0.4,3.2]

P

  

0.17/ 0.34/ 0.18

0.01/ 0.44/ 0.07

0.00/ 0.09/ 0.55

SIDu (mEq/L)

No-AKI

-

-

32 [15,88]

31 [-9,63]

29 [-2,67]

transient

21 [-5,71]

82 [9,107]

39 [16,58]

31 [1,57]

15 [-9,47]

persistent

29 [7,64]

41 [31,71]

48 [26,67]

45 [29,68]

39 [28,64]

P

  

0.21/ 0.44/ 0.44

0.16/ 0.12/ 0.92

0.00/ 0.00/ 0.22

FENa (%)

No-AKI

-

-

0.5 [0.2,1.3]

0.5 [0.2,0.9]

1.0 [0.3,2.0]

transient

0.6 [0.3,2.0]

0.5 [0.3,0.6]

0.6 [0.2,1.3]

0.5 [0.2,1.2]

1.0 [0.3,1.7]

persistent

1.2 [0.3,4.8]

1.5 [0.4,2.4]

0.7 [0.2,1.7]

0.9 [0.2,2.3]

0.7 [0.3,3.5]

P

  

0.16/ 0.34/ 0.57

0.34/ 0.25/ 0.92

0.47/ 0.43/ 0.81

FEUr (%)

No-AKI

-

-

32.1 [23.0,42.4]

35.7 [25.8,43.4]

35.8 [27.1,44.3]

transient

38.6 [17.4,49.2]

23.1 [19.7,40.0]

26.5 [16.7,42.6]

34.1 [26.2,44.0]

36.2 [26.9,49.8]

persistent

40.2 [30.6,48.8]

23.9 [21.2,43.2]

29.2 [19.8,36.8]

33.3 [21.8,43.6]

32.4 [24.9,43.8]

P

  

0.25/ 0.56/ 0.21

0.77/ 0.92/ 0.70

0.11/ 0.10/ 0.81

  1. Day 0: day of AKI diagnosis; NaU: spot urinary sodium; ClU: spot urinary chloride; KU: spot urinary potassium; SIDu: spot urinary strong ion difference;
  2. FENa: fractional excretion of sodium; FEUr: fractional excretion of urea.
  3. * among the three groups; ** between transient and persistent AKI; *** between no-AKI and transient AKI.