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Table 4 Creatinine concentrations, fluid balance, renal replacement therapy, and mortality rates in patients with transient, prolonged, and permanent oliguria

From: The clinical relevance of oliguria in the critically ill patient: analysis of a large observational database

 Non-oliguric on admission
n = 6242
Oliguria during ICU stay, n = 1349p value (across groups)
Transient
n = 390 (28.9%)
Prolonged
n = 141 (10.5%)
Permanent
n = 818 (60.6%)
SAPS II score, mean ± SD37.9 ± 15.147.1 ± 16.7£54.4 ± 17*49.7 ± 18.8$,£< 0.001
Creatinine, highest concentration (mg/dl), median [IQR]0.9 [0.7–1.3]1.2 [0.8–2.1]£1.6 [1.1–3.4]*1.5 [0.9–2.8]*< 0.001
Daily fluid balancea, ml, median [IQR]3.3 [−612–605.7]49.9 [− 521–650]105.0 [− 541.3–780.1]308.9 [− 171.5–1123.7]*,$,£< 0.001
RRT at admission, n (%)97 (1.6)22 (5.6)£31 (22)*121 (14.8)*< 0.001
RRT during ICU stay, n (%)407 (6.5)48 (12.3)£63 (44.7)*273 (33.4)*,$,£< 0.001
ICU mortality, n (%)700 (11.5)27 (7.1)£15 (10.9)232 (28.9)*,$,£< 0.001
 In non RRT patients, n (%)580 (10.2)22 (6.6)8 (10.7)102 (19.1)*< 0.001
 In RRT patients, n (%)120 (29.9)5 (10.9)£7 (11.3)£130 (48.3)*,$,£< 0.001
End-of-life decision, n (%)728 (11.7)47 (12.1)12 (8.5)163 (19.9)*,$,£< 0.001
 In non RRT patients, n (%)650 (11.1)43 (12.6)8 (10.3)86 (15.8)£0.012
 In RRT patients, n (%)78 (19.2)4 (8.3)4 (6.3)77 (28.2)*,$,£< 0.001
Hospital mortality, n (%)983 (16.7)53 (14.7)33 (24.8)*296 (37.7)*,$,£< 0.001
  1. Pairwise p values: *vs transient; $vs prolonged; £vs non-oliguric on admission. aTotal fluid balance divided by the length of ICU stay. IQR interquartile range, RRT renal replacement therapy, ICU intensive care unit. Percentages are calculated after excluding missing data