Table 1. The changes of PaO2/FiO2, PaCO2, heart rate, and respiratory frequency during NIV treatment (n=12).

	PaO2/Fi O2	PaO2(mmHg)	Heart rate (b/min)	Respiratory frequency(T/M)
Before Treatment	110±30	52±10	125±18	32±6
After Treatment	200±28*	88±9*	92±11*	22±5*
P value	<0.001	<0.001	<0.001	<0.001

* The data of "before the treatment" means the last data of blood-gas analysis before the first time to take the BiPAP ventilator