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Table 2 Respiratory and hemodynamic data during the three steps of the study

From: Diaphragm ultrasound as indicator of respiratory effort in critically ill patients undergoing assisted mechanical ventilation: a pilot clinical study

  PS15 PS5 PS0 P
Tidal volume, ml 836 ± 250 496 ± 210 456 ± 182 <0.001
Respiratory rate, min−1 10.7 ± 4.3 16.0 ± 6.8 16.7 ± 7.6 0.003
Minute ventilation, l/min 8.2 ± 2.1 7.4 ± 2.5 6.8 ± 2.1 0.119
Mean airway pressure, cmH2 O 11.8 ± 2.9 8.7 ± 2.0 7.6 ± 1.9 <0.001
Mean arterial pressure, mmHg 77.9 ± 8.8 78.8 ± 10.6 80.2 ± 11.4 0.751
Heart rate, min−1 63.9 ± 19.1 65.7 ± 19.4 66.5 ± 21.0 0.899
pH 7.39 ± 0.05 7.37 ± 0.04 7.36 ± 0.04 0.090
PaO2 , mmHg 176.7 ± 48.3 179.3 ± 50.0 175.2 ± 61.9 0.967
PaCO2 , mmHg 42.2 ± 5.3 43.8 ± 4.4 45.1 ± 5.1 0.147
Base excess, mmol/L 1.0 ± 2.9 0.7 ± 2.9 0.6 ± 3.0 0.899
  1. Results are expressed as mean ± SD. PS, pressure support; PaO2, partial pressure of oxygen in arterial blood; PaCO2, partial pressure of carbon dioxide in arterial blood.