Table 5.
Univariate logistic regressions on high-risk (MAP <65) versus low-risk (MAP >65) patients in the 45° position.
| MAP >65 mmHg (n = 128) Mean (SD) | MAP <65 mmHg (n = 72) Mean (SD) | OR | P value | ||
|---|---|---|---|---|---|
| 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%) | |||
aPer 0.01 unit change.
bPer 0.001 unit change.
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.