Lecture 6: Oxygen Therapy Flashcards
1
Q
features of oxygen cylindres
A
- widely available various sizes - limited duration of supply - suitable for short term treatment - delivers 100% oxygen - expensive
2
Q
features of wall supply oxygen
A
- hospital only
- may not be available in all clinical areas
- delivers 100% oxygen
- midpoint of ball marks flow rate
3
Q
features of concentrators
A
- use at home
- mains operated
- molecular sieve that removes nitrogen from the air
- for patients that need constant oxygen
- provides roughly 90% oxygen
4
Q
features of liquid oxygen
A
- more highly compressed
- allow higher flow rates
5
Q
flow rates of nasal cannulae
A
1-4 L/min
6
Q
flow rates of uncontrolled masks
A
5-10 L/min
7
Q
what is the target oxygen saturation for a patient
A
94-98%
8
Q
what is the target oxygen saturation for patients at risk of hypercapnic respiratory failure
A
88-92%
9
Q
when does a patient qualify for long term oxygen therapy
A
pO2 < 7.3 pO2 between 7.3 and 8 and: - secondary polycythaemia - nocturnal hypoxaemia - peripheral oedema - pulmonary hypertension
10
Q
how many hours a day should a patient use their long term oxygen therapy for
A
> 15 hours
11
Q
what is apnoea
A
cessation of airflow for 10 seconds or more
12
Q
what is hypopnea
A
- reduction in airflow by 50%
- and desaturation of 4% and/or arousal from sleep
13
Q
what is obstructive sleep apnoea
A
5 or more obstructive apnoeas per hour
