OXYGEN DELIVERY SYSTEMS
Low-flow systems:† oxygen flows at less than inspiratory demand, actual FiO2 is highly dependent upon ptís minute ventilation and pattern.
1.†† nasal canulae: FiO2 24-50%, max flow rate 6L/min
2.†† simple mask: FiO2 35-50%, min flow rate 5L/min to allow mask washout.
3.†† mask with reservoir bag (partial or non-rebreather): capable of FiO2>90%, but practically only about 60%.
High-flow systems:† oxygen flows fast enough to completely satisfy inspiratory demand
1.†† Venturi mask: max FiO2 50%
2.†† high-flow mask: max FiO2 60-70%