Effect of TVs and oxygen flow rate on FO2 insp.
In the normal lung mechanics settings, a low f (10breaths/min) with an
oxygen flow of 1L/min displayed a measured FO2 insp.
that was 1.116 times greater at a low VT than at the
normal VT; conversely, the lowest measured
FO2 insp. at the high VT was 0.966 times
that of the normal VT. Similar trends appeared with
oxygen flow rates of 3 and 5L/min. The post-hoc analysis showed
significant differences in performance as the f increased to
20breaths/min (p < 0.05) and 30breaths/min
(p < 0.05), except at 1L/min of oxygen flow with
30breaths/min (p =0.342). When we tested the restrictive and
obstructive lung mechanics, the FO2 insp. values during
different VT at 1, 3 and 5L/min oxygen delivery also
showed the same patterns as normal lung mechanics (Fig. 5).