Research Article

[Retracted] Effect of Noninvasive Positive Pressure Ventilation on Prognosis and Blood Gas Level in COPD Patients Complicated with Respiratory Failure

Figure 2

Comparison of BG analyzer results. Comparison of PaCO2 (a), PaO2 (b), and CaO2 (c). Note. represents compared with the same group before treatment; # represents compared with the regular group.
(a)
(b)
(c)