Table 4.

Modeling of denitrogenation.

Breath	New horse O2%—FeO2	New system O2%—FiO2
1	43.57	87.91
2	56.24	81.70
3	63.51	78.67
4	67.84	77.37
5	70.57	76.99
6	72.40	77.10
7	73.74	77.47
8	74.81	77.97
9	75.71	78.54
10	76.52	79.13
11	77.27	79.72
12	77.97	80.31
13	78.64	80.89
14	79.28	81.46
15	79.90	82.01
16	80.50	82.54
17	81.09	83.06
18	81.65	83.56
19	82.20	84.05
20	82.73	84.53

The denitrogenation phase values shows the situation with a machine prefilled with 100% oxygen, a machine’s volume of 28 L and horse’s FRC of 15 L. Calculations predicted that with an oxygen flow at 8 L min⁻¹ the FeO₂ would reach 67% after four breaths.