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Table 2 Respiratory parameters, hemodynamics and biological data

From: Physiological effects of invasive ventilation with neurally adjusted ventilatory assist (NAVA) in a crossover study

Respiratory parameters CV NAVA NAVA versus CV P
Respiratory rate (/min) 30 (7) 35 (13) +26.4 (-3.6, +56.4) 0.17
VT (ml/kg) 6.6 (0.7) 6.9 (0.3) +5.3 (-5.5, +16.1) 0.46
Minute volume (L/min) 1.7 (0.4) 1.6 (0.6) +5.4 (-4.3, +15.1) 0.67
PIP (cm H2O) 21 (6) 11 (4) -32.7 (-48.2, -17.1) 0.04
PEEP (cm H2O) 4 (2) 4 (2) - (a)
EAdi max (microVolt) 3.9 (3.8) 6.3 (1.4) +61.2 (-4.6, +126.9) 0.34
SpO2 (%) 98 (3) 96 (3) -1.2 (-2.8, +0.5) 0.14
FiO2 30 (4) 30 (4) - (a)
Crs (ml/kg.cm H2O) 0.37 (0.19) 0.87 (0.32) +98.4 (+43.8, +153.0) 0.04
Hemodynamic parameters
Heart rate 156 (15) 156 (22) +2.1 (-0.7, +4.5) 0.17
Systolic arterial pressure (mmHg) 93 (6) 99 (13) +8.4 (+3.3, +13.6) 0.03
Diastolic arterial pressure (mmHg) 54 (12) 57 (6) +3.6 (-3.0, +10.1) 0.46
Central venous pressure (mmHg) 11 (5) 10 (5) +3.9 (-5.3, +13.1) 0.92
Cerebral NIRS (%) 62 (5) 61 (3) +1.6 (-2.6, +5.8) 0.34
Cardiac index (L/min.m2) 2.33 (0.84) 2.26 (0.70) +1.4 (-3.4, +6.2) 0.17
Pulse oximeter perfusion index (%) 1.50 (2.45) 1.78 (2.29) +18.8 (+3.0, +34.7) 0.04
Venous blood gases
pH 7.32 (0.04) 7.32 (0.02) -0.1 (-0.4, +0.2) 0.34
PCO2 (mm Hg) 47.3 (5.1) 45.8 (8.1) +0.6 (-5.1, +6.3) 0.50
ScvO2 (%) 60.1 (20.9) 58.4 (15.4) +3.3 (-5.7, +12.2) 0.60
  1. Measurements in NAVA and CV are reported as median (interquartile). Variations between NAVA versus CV are reported as mean percentage (95 % CI). Statistical analyses between NAVA versus CV were performed by a Wilcoxon test for paired samples
  2. (a) No changes in PEEP, FiO2, neither in sedation or inotropic doses were allowed during these study periods
  3. NAVA Neurally adjusted Ventilatory Assist, CV Conventional Ventilation, V T tidal volume, PIP peak inspiratory pressure, Crs respiratory system compliance, EAdi electrical activity of the diaphragm, ScvO 2 central venous oxygen saturation