Table 1.

Modeling of denitrogenation.

Breath	New horse O2%—FeO2	New system O2%—FiO2
1	39.23	86.98
2	50.25	79.73
3	57.05	75.83
4	61.39	73.89
5	64.27	73.07
6	66.30	72.90
7	67.83	73.11
8	69.04	73.52
9	70.08	74.04
10	70.99	74.62
11	71.83	75.23
12	72.61	75.85
13	73.36	76.47
14	74.08	77.08
15	74.77	77.67
16	75.44	78.26
17	76.09	78.83
18	76.72	79.39
19	77.34	79.93
20	77.93	80.46

The denitrogenation phase assumes a machine prefilled with 100% oxygen, a machine’s volume of 28 L and horse FRC of 20 L. Calculations predicted that with an oxygen flow at 8 L min⁻¹ the FeO₂ reached 67% after six breaths.