Use of O2

Question 1

order of O2 devices

Answer 1

nasal cannula (1-6) –> SFM (5-10) –> venturi –> 15l NRB –> CPAP –> BiPAP –> ET tube –> tracheostomy

Question 2

complications of IMV

Answer 2

• (teeth/vocal cord) trauma
• tracheal stenosis
• HD instability

Question 3

nasal cannula preferred in

Answer 3

post-op drowsy px due to warm moist air

Question 4

4 tricks to check ET tube placement

Answer 4

mist on tube
chest expansion
apex auscultation
7 cycles on capnograph

Question 5

O2 prescribed in

Answer 5

hypoxaemia NOT breathlessness

Question 6

cannula flow rate vs O2% delivered

Answer 6

0l –> 21%
1l –> 24%
2l –> 28%
4l –> 36%

Question 7

venturi flow rate & % delivered (in the blue sea on a white boat in piss yellow then blood before i vomit green)

Answer 7

2l –> 24%
4l –> 28%
8l –> 35%
10l –> 40%
15l –> 60%
(once a valve is maxed out increasing flow rate doesn’t affect % delivered)

Question 8

NRBM % delivered

Answer 8

85%

Question 9

general principle of O2 prescribing

Answer 9

start simplest & least invasive then escalate up

Question 10

in head injury & low GCS (<8)

Answer 10

consider intubate (ET)

Question 11

how to recognise O2 creep

Answer 11

• Use O2 prescription chart
• Frequently assess RR
• Write FiO2 (or current O2 therapy) on ABG results