Oxygen (O2) delivery systems
Commencing oxygen
Give O2 to maintain O2 saturation greater than 94%. If not maintained consult MO.
If patient with COPD and chronic hypoxia deliver O2 to reach SaO2 of 90%
O2
1 l/min
4 l/min
6 L/min
10 l/min
Nasal Cannula (Prongs)
Flow rates 0.25-6 L/min
•
1 L/min delivers 24% (approx) FiO2*
•
2 L/min delivers 28% (approx) FiO2*
•
3 L/min delivers 32% (approx) FiO2*
•
4 L/min delivers 36% (approx) FiO2*
Flow rates > 4 L/min can cause membrane
dryness.
Mouth breathing does not affect inspired O2 (O2 drawn
down trachea by oral cavity)
Hudson Mask
•
•
6 L/min delivers 40% (approx) FiO2*
8 L/min delivers 60% (approx) FiO2*
Flow rates < 5 L/min not recommended because of
rebreathing
Flow rates >10 L/min do not increase % oxygen delivered
Venturi Mask
Check
mask for
flow rate
up to
15 L/min
delivers 24%, 26%, 28%, 30%, 35%, 40% or 50% FiO2
according to % selected dilutor jet on mask
•
green 24-30% (at recommended flow rate)
•
white 35-50% (at recommened flow rate)
Venturi supplies the most consistent and accurate FiO2
Non Rebreathing Mask
12 l/min
15 l/min
•
•
•
12-15 L/min delivers 85-90% FiO2
generally used for resuscitation
reservoir bag must be used if % required is more
than 60%
•
reservoir bag must not be deflated more than 1/2
•
one way valve closed preventing expired CO2 from
mixing with O2.
Oxygen % delivered depends on quality of seal.
Need to ensure reservoir bag is full prior to attaching
mask to the patient
* FiO2 - inspired oxygen fractions