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Table 2 Admission bioelectrical impedance vector analysis data, haemodynamics, oxygen exchange and biochemical data

From: Bioelectrical impedance vector analysis in critically ill patients: a prospective, clinician-blinded investigation

  Dehydration Normal Overhydration P valuea
(n =14) (n =22) (n =25)
BIVA data     
 Hydration, % 71.0 (64.2–72.6) 73.5 (73.2–73.9) 85.2 (78.4–89.0) <0.001
 Resistance/height, Ω/m 321 (249–348) 314 (257–351) 224 (188–267) 0.002
 Reactance/height, Ω/m 43.6 (40.7–58.9) 29.6 (26.4–33.9) 16.5 (11.5–20.4) <0.001
 Phase angle, degrees 9.1 (7.3–10.3) 5.5 (5.2–6.3) 3.8 (3.0–4.4) <0.001
Haemodynamic data     
 Mean arterial pressure, mmHg 71 (67–76) 78 (70–92) 71 (67–78) 0.13
 Central venous pressure, mmHg 11 (8–12) 10 (8–12) 12 (10–14) 0.08
 Missing observations, n 3 9 0  
 Noradrenaline, μg/min 3.5 (0–6) 0 (0–2) 6 (1–10) 0.04
Oxygen exchange     
 FiO2, % 0.40 (0.25–0.50) 0.30 (0.21–0.40) 0.30 (0.21–0.40) 0.28
 PaO2, mmHg 82 (67–98) 105 (75–122) 82 (72–97) 0.07
 PaO2/FiO2 ratio, mmHg 249 (166–300) 334 (273–407) 316 (236–419) 0.06
Biochemical data     
 Creatinine, μmol/L 72 (55–131) 70 (40–100) 116 (73–160) 0.03
 Missing observations, n 1 0 0  
 Sodium, mmol/L 138 (134–142) 137 (135–140) 137 (135–139) 0.97
 Lactate, mmol/L 1.6 (1.1–2.2) 1.5 (1.1–2.4) 1.9 (1.4–2.5) 0.45
  1. BIVA bioelectrical impedance vector analysis, FiO 2 fraction of inspired oxygen, PaO 2 partial pressure of arterial oxygen
  2. Continuous variables are presented as median (interquartile range)
  3. aStatistical comparisons of the data were performed using the Kruskal-Wallis test