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Table 2 The changes of respiratory parameters in six eligible patients before and after NPPV application

From: Evaluation of noninvasive positive pressure ventilation after extubation from moderate positive end-expiratory pressure level in patients undergoing cardiovascular surgery: a prospective observational study

No. P/F ratio (mmHg) RR ( /min) PaCO2(mmHg)
Before After Before After Before After
1 201.2 287.4 15 12 32.6 33.0
2 248.3 280.4 13 11 33.3 36.5
3 246.4 298.2 16 14 36.7 28.9
4 351.2 458.4 31 25 34.1 34.7
5 206.6 228.6 18 20 41.3 40.6
6 219.2 398 16 20 25.8 25.7
mean ± SD 245 ± 55 325 ± 85* 18.2 ± 6.5 17.0 ± 5.5 34.0 ± 5.1 33.2 ± 5.3
  1. *p < 0.05 compared with before. P/F ratio, partial pressure of arterial oxygen tension to inspiratory oxygen fraction ratio; RR, respiratory ratio; PaCO2, partial pressure of arterial carbon dioxide.