Question

1. Calculate the air: O₂ ratio of 30% O₂: air entrainment device ___________
2. An oxygen flowrate of 12 L/min is used on a 60% Oxygen: air entrainment mask. What is the O₂: air entrainment ratio and total flow? ___________
3. If the patient’s blanket is covering the port on the air entrainment device, what is the FiO2 that is being delivered? _______%

Answer 1

#. Air entrainment device - Venturi mask

#. Oxygen : Air entrainment ratio = liters of air / liters of oxygen

= 100-60%/ 60%-21

= 40: 39

= 1 :1

Formula to determine the total gas flow from the device is: (a x L/min.) + (o x L/min.)

=( 1× 12l/ min) + (1× 12l/ min )

= 24l / min