Oxygen

Question 1

What percentage of oxygen can be delivered via a simple face mask?

Answer 1

28%

Question 2

What fraction of oxygen can be delivered via a venturi mask?

Answer 2

24-60% from 4-12L per minute

Question 3

How should oxygen for resuscitation be delivered?

Answer 3

100% 15L per minute through a non-rebreathe mask

Question 4

Name two conditions which might indicate home oxygen supply

Answer 4

COPD, cluster headaches

Question 5

Contraindications of oxygen therapy

Answer 5

Paraquat poisoning
Bleomycin lung fibrosis
Newborns (retinopathy of prematurity and blindess)

Beware hypoxic drive inhibition in COPD but still give 100% in emergency

Question 6

Side effects of oxygen therapy

Answer 6

Vasoconstriction
Dry throat/mouth and nosebleeds
Headaches, sleepiness, flushing

FIRE RISK - explosion eg defibrillator, cigarettes

Question 7

Which drugs interact with oxygen

Answer 7

Amiodarone- may cause ARDS

Bleomycin - lung toxicity

Question 8

What type and dose of oxygen therapy can be given via nasal cannulae?

Answer 8

Supplemental oxygen, up to 40% at 2-6L/min