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Table 5 Univariate logistic regressions on high-risk (MAP <65) versus low-risk (MAP >65) patients in the 45° position.

From: The effects of the semirecumbent position on hemodynamic status in patients on invasive mechanical ventilation: prospective randomized multivariable analysis

   MAP >65 mmHg (n= 128) Mean (SD) MAP <65 mmHg (n= 72) Mean (SD) OR Pvalue
Age (years) 59.8 (16.0) 60.5 (15.7) 1.00 0.77
BMI 27.1 (5.0) 27.7 (7.2) 1.02 0.52
SAPS II 37.9 (11.1) 40.9 (12.6) 1.02 0.09
Measured backrest elevation before intervention (°) 26.6 (6.2) 23.6 (6.0) 0.92 0.002
Peak pressure (cm H2O) 19.3 (4.6) 21.3 (4.4) 1.10 0.005
Fluid balance last 24 h (mL) 565 (1105) 718 (1097) 1.00 0.35
Albumin (g/L) 22.6 (6.3) 22.3 (6.2) 0.99 0.76
Hb (g/dL) 9.6 (2.0) 9.4 (1.8) 0.92 0.30
CRP (mg/L) 115.2 (92.1) 116.6 (97.3) 1.00 0.92
   Median (IQR) Median (IQR)   
Ventilation hours (h) 24 (55) 28 (55) 1.00 0.45
Tidal volume (mL) 490 (147) 502.5 (140) 1.00 0.92
PEEP (cm H2O) 6 (3) 7.5 (5) 1.13 0.013
Norepinephrine (μg/kg/min) 0.06 (0.12) 0.09 (0.16) 1.04a 0.005
Propofol (mg/kg/min) 0.02 (0.03) 0.02 (0.02) 1.07a 0.44
Sufentanil (μg/kg/min) 0.01 (0.01) 0.01 (0.01) 1.00b 0.99
Epinephrine (μg/kg/min) 0.00 (0.00) 0.00 (0.00) 1.02b 0.33
Dobutamin (μg/kg/min) 0.00 (0.00) 0.00 (0.00) 1.28 0.37
CRP (mg/L) 103.5 (145.8) 88.4 (154.4) 1.00 0.92
   Cases (%) Cases (%)   
Ventilation mode Spontaneous (PSV) 57 (44.5%) 17 (23.6%) 1.61 0.004
  Controlled (PCV) 71 (55.5%) 55 (76.4%)   
  1. aPer 0.01 unit change.
  2. bPer 0.001 unit change.
  3. BMI, body mass index; CRP, C-reactive protein; Hb, hemoglobin; IQR, interquartile range; MAP, mean arterial pressure; OR, odds ratio; PCV, pressure-controlled ventilation; PEEP, positive end-expiratory pressure; PSV, pressure support ventilation; SAPS II, Simplified Acute Physiology Score; SD, standard deviation.