Table 2 Transpulmonary pressures, ventilatory parameters, arterial blood gases, calculated pulmonary shunt, oxygen delivery, heart rate, and cerebral perfusion pressure during a lung recruitment procedure by successive increases of mean airway pressure
20 mbar mean airway pressure | 25 mbar mean airway pressure | 30 mbar mean airway pressure | ||||
|---|---|---|---|---|---|---|
HFOV | PCV | HFOV | PCV | HFOV | PCV | |
Transpulmonary pressure (mbar) | 15 ± 3 | 15 ± 3 | 19c ± 2 | 18a ± 3 | 22cd ± 2 | 23ab ± 2 |
Respiratory rate (minute-1) | 300 | 18 ± 10 | 300 | 21 ± 11 | 300 | 27ab ± 10 |
Oscillatory pressure amplitude (mbar) | 40 ± 7 | NA | 41 ± 8 | NA | 52cd ± 8 | NA |
Dynamic compliance of the respiratory system (ml/mbar) | NA | 18 ± 5 | NA | 17 ± 4 | NA | 12ab ± 3 |
Tidal volume per kg bodyweight (ml/kg) | NA | 13 ± 3 | NA | 12 ± 4 | NA | 10ab ± 2 |
PaO2 (kPa) | 21 ± 4 | 19 ± 6 | 57c ± 10 | 43a ± 21 | 69cd ± 7 | 71ab ± 11 |
PaCO2 (kPa) | 5.3 ± 0.3 | 5.4 ± 0.3 | 5.4 ± 0.31 | 5.3 ± 0.3 | 5.4 ± 0.3 | 5.4 ± 0.3 |
Pulmonary shunt (%) | 22 ± 8 | 23 ± 7 | 6c ± 3 | 10 ± 6 | 3cd ± 1 | 3a ± 1 |
Oxygen delivery (ml/minute) | 347 ± 64 | 356 ± 73 | 341 ± 65 | 353 ± 50 | 335 ± 63 | 338 ± 57 |
Heart rate (minute-1) | 119 ± 16 | 123 ± 19 | 121 ± 16 | 129 ± 19 | 129b ± 18 | 134a ± 18 |
Cerebral perfusion pressure (mmHg) | 74 ± 15 | 80 ± 10 | 68 ± 10 | 70 ± 8 | 62b ± 9 | 65a ± 13 |