Table 2.

Breathing pattern and gas exchange in different experimental conditions

	HF-T 1	Conventional O2	HF-T 2	p
RR (breaths/min)	19.4 ± 3.9	20.1 ± 4.3	20.4 ± 5.4	0.94
TiNEUR (s)	1.07 ± 0.21	1.03 ± 0.2	1.02 ± 0.24	0.88
pH	7.51 ± 0.04	7.51 ± 0.04	7.52 ± 0.04	0.76
PaCO2 (mm Hg)	44 ± 9	44 ± 8	43 ± 8	0.93
HCO3− (mEq/L)	33 ± 4.5	33 ± 4	33 ± 4	0.99
PaO2 (mm Hg)	109 ± 27	92 ± 17	111 ± 28	0.09
PaO2/FiO2	219 ± 59	187 ± 50	223 ± 45	0.13

Data are expressed as mean ± standard deviation

HF-T, high-flow tracheotomy cannula oxygen therapy; conventional O₂, conventional low-flow oxygen therapy through a T-piece; RR, respiratory rate; Ti_NEUR, neural inspiratory time; PaCO₂, arterial partial carbon dioxide pressure; PaO₂, arterial partial oxygen pressure; FiO₂, inspiratory oxygen fraction