Oxygen Therapy

Question 1

SATS target for:

• Normal
• Suspected COPD - i.e. long-term smoker with unexplained SOB

Answer 1

94-98%

88-92%

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Question 2

Nasal cannulae:

• What is the percentage range of FiO2?
• Where may patients get sore?

Answer 2

24-40%

Nasal soreness

Question 3

Simple oxygen face mask:

• What is the percentage range of FiO2?
• Why is this used for type 1 respiratory failure instead of type 2? - 2 reasons
• What is another name for this mask? - H

Answer 3

40-60%

(1) It gives a less precise amount of O2
(2) CO2 also accumulates within the mask - trying to avoid hypercapnia

Hudson mask

Question 4

Fixed percentage oxygen mask:

• What is another name for this?
• Why is this preferred for type 2 respiratory failure?

Answer 4

Venturi mask

It gives a precise percentage of FiO2 at high flow rates.

Question 5

Non-rebreathe mask:

Why is this only used in emergencies and avoided in those who need to be on controlled oxygen therapy?

Answer 5

It gives a high concentration of O2 (60-90%) and a high flow rate.
They are also imprecise so it is hard to control in those who need controlled therapy.