Oxygen Therapy

Question 1

What is used to determine oxygen saturation

Answer 1

ABG and oximeter

Question 2

How much does the fraction of inspired oxygen (Fi02) increase by every 1L/min?

Answer 2

4%

Question 3

What percentage of oxygen and amount per min is required with high-concentration cases?

Answer 3

100% or 15L via mask

Question 4

When should high concentrations of oxygen be used?

Answer 4

in uncomplicated type 1 respiratory failure, with little risk of hyperventilation.

Question 5

When should low concnetrations of oxygen be used?

Answer 5

When patients are at risk of CO2 retention or have low 02 requirements

Question 6

What should not be used with oxygen and why?

Answer 6

Amiodarone because it can increase the risk of adult respiratory distress syndrome and rapid onset of respiratory failiure

Question 7

What percentage of oxygen should be the aim in those not at risk of type 2 resp failure?

Answer 7

94-98%

Question 8

What percentage of oxygen should be the aim in those who are at risk of type 2 hypercapnic resp failure?

Answer 8

88-92%

Question 9

What are the principles of criteria of the long-term oxygen therapy

Answer 9

p02 < 7.3kPA on ABG, or <8.0kPA with complications, non-smoker

Question 10

When is nasal cannulae used?

Answer 10

Mild hypoxaemia when the patient is not critically unwell.

Question 11

How much oxygen does a nasal cannulae deliver?

Answer 11

24-30% O2

Question 12

When should a simple face mask be used?

Answer 12

Mild to moderate hypoxia

Question 13

How much oxygen does a simple face mask deliver?

Answer 13

30-40%

Question 14

What is a disadvantage of a simple face mask?

Answer 14

Risk of aspiration if patient vomits whilst wearing the mask

Question 15

What is a disadvantage of a nasal cannulae

Answer 15

High flows (>4L/min) dry and irritates the nasal passage

Question 16

When should a reservoir be used?

Answer 16

Moderate to severe hypoxia

Question 17

How much oxygen does a reservoir deliver?

Answer 17

70% when used with 15L/min flow rate

Question 18

What is a disadvantage of a reservoir mask?

Answer 18

Don’t have a true seal so breathing in some room air is unavoidable and performance of the device can vary depending on the seal

Question 19

When should a venturi mask be used?

Answer 19

COPD patients

Question 20

How does a venturi mask work?

Answer 20

Delivers a constant Fi02 - fixed performance. Flow rate and percentage of oxygen are indicated by the colours on the mask

Question 21

How does humidified oxygen work?

Answer 21

oxygen is passed through a humidifying device producing a sterile vapour.

Question 22

When is humidified oxygen most effective?

Answer 22

When the gas reaches the alveoli is body temperature with a relative humidity of 100%

Question 23

How does high flow 02 work?

Answer 23

Wide-bore nasal cannula where 02 is driven through a humidified circuit

Question 24

What is the benefit of high flow 02 therapy?

Answer 24

delivers up to 100% o2 and improves work of breathing

Question 25

what is a CPAP?

Answer 25

Continuous positive airway pressure, splitns open airways and prevents them from collapsing

Question 26

when should a CPAP be used?

Answer 26

neonates and in mild obstructive sleep apnoea