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Table 1 Patient characteristics

From: The passive leg raising test to guide fluid removal in critically ill patients

  Patients without intradialytic hypotension
(n = 26)
Patients with intradialytic hypotension
(n = 13)
p value
Age (years) 63 [49–69] 63 [54–80] 0.17
Male gender (no, %) 17 (65 %) 8 (59 %) 0.99
Simplified Acute Physiology Score II 41 [46–55] 49 [45–53] 0.49
Previous chronic renal failure (no, %) 10 (40 %) 5 (38 %) 0.82
Previous chronic arterial hypertension (no, %) 8 (30 %) 5 (40 %) 0.79
Aetiology of acute circulatory failure (no, %)
 Septic 20 (77 %) 10 (77 %) 0.69
 Cardiogenic 6 (23 %) 3 (23 %) 0.69
Incidence of shock diagnosis criteria at the initial phase
 Systolic arterial pressure <90 mmHg 26 (100 %) 13 (100 %)
 Decrease >50 mmHg in previously hypertensive patients 0 (0 %) 1 (8 %) 0.68
 Need for norepinephrine administration 26 (100 %) 13 (100 %)
 Urine output <0.5 mL/kg/h for at least 2 h 26 (100 %) 12 (92 %) 0.68
 Heart rate >100 beats/min 20 (77 %) 13 (100 %) 0.16
 Skin mottling 8 (31 %) 6 (46 %) 0.57
 Blood lactate >2 mmol/L 26 (100 %) 11 (85 %) 0.21
Left ventricular ejection fraction (%) 50 [30–60] 45 [35–52] 0.57
Modalities of ventilation
 Invasive mechanical ventilation (no, %) 11 (42 %) 6 (46 %) 0.91
  Tidal volume (mL/kg) 6 [6–7] 7 [6–7] 0.34
  PEEP (cmH2O) 7 [6–10] 7 [7–11] 0.22
  Plateau pressure (cmH2O) 17 [16–19] 18 [16–24] 0.31
  Respiratory rate (min−1) 20 [15–20] 20 [20–21] 0.71
 Non-invasive mechanical ventilation (no, %) 6 (23 %) 0 (0 %) 0.16
 No mechanical ventilation (no, %) 9 (35 %) 7 (54 %) 0.43
Acute respiratory distress syndrome (no, %) 10 (38 %) 6 (46 %) 0.89
Blood urea nitrogen (mmol/L) 32 [28–34] 30 [29–31] 0.25
Patients receiving norepinephrine (no, %) 9 (35 %) 7 (54 %) 0.43
Dose of norepinephrine (µg/kg/min) 0.15 [0.04–0.25] 0.24 [0.21–0.32] 0.69
Lactate (mmol/L) 1.1 [0.9–1.1] 0.9 [0.9–1.1] 0.38
Days in the ICU before inclusion (days) 13 [6–28] 11 [5–18] 0.67
  1. Values are expressed as median [interquartile range] or number and frequency in  %
  2. There was no significant difference between patients with and patients without intradialytic hypotension
  3. PEEP positive end-expiratory pressure; RRT renal replacement therapy