Oxygen Delivery Systems

Question 1

What is the difference between low and high flow systems?

Answer 1

Low flow will not meet all of the pt’s inspiratory flow requirements, while high flow meets or exceeds these inspiratory flow demands.

Question 2

What does the FiO2 depend on in a low flow system?

Answer 2

Reservoir size, pt’s ventilatory pattern, and the oxygen flow.

Question 3

What are some pros to low flow systems?

Answer 3

Convenient and easy to set up, and can deliver or target high and low FiO2.

Question 4

What are some cons of low flow systems?

Answer 4

The FiO2 is variable.

Question 5

When is a low flow system suitable?

Answer 5

When the Vt is 200-700ml, the RR is <25/min, the ventilatory pattern is regular and consistent, and when a consistent and predictable FiO2 is not required.

Question 6

What factors do you need to know to determine high flow requirements?

Answer 6

Minute volume and Vt, cycle time, inspiratory time, expiratory time, inspiratory flow

Question 7

What are some pros of a high flow system?

Answer 7

Can deliver a high and low FiO2, constant and predictable, can control temp and humidity.

Question 8

What are some cons of a high flow system?

Answer 8

Set up can be time consuming, requires regular monitoring, more expensive.

Question 9

When do we need high flow?

Answer 9

Whenever consistent and predictable FiO2 is required.

Question 10

What is the FiO2 range of a nasal catheter?

Answer 10

0.24-0.44

Question 11

What is the FiO2 range of a simple mask?

Answer 11

0.4-0.6

Question 12

What is the FiO2 range of a partial rebreathing mask?

Answer 12

0.6-0.8+

Question 13

What is the FiO2 range of a non-rebreathing mask?

Answer 13

0.8+

Question 14

Describe how an oxymask works.

Answer 14

They use the coanda effect to entrain room air and mix it with oxygen.

Question 15

What is the FiO2 range of an oxymask?

Answer 15

0.24-0.9