Exam 2: Supplemental Oxygen

Question 1

What is FiO2?

Answer 1

fraction of inspirited oxygen- approx. percentage of inspired oxygen that the pt is breathing

Question 2

What is normal FiO2 in room air at sea level?

Answer 2

.21 or 21%, this can be increased with supplemental oxygen to adjust for gas exchange impairment

Question 3

When would supplemental oxygen be used?

Answer 3

pulm dz, cardiac dz, septic shock, med emergency

Question 4

What are different types of oxygen delivery systems?

Answer 4

1. supp O2
2. access to airways- ETT, Tracheostomy
3. Assissted ventilation

Question 5

What are two types of supp O2?

Answer 5

1. nasal cannula, face masks

Question 6

What are important things to remember about supp O2?

Answer 6

1. it is a medication
2. physician order required
3. orders are either for titration or continuous use

Question 7

What are some important safety reminders with supp O2?

Answer 7

1. keep away from open flames/no smoking
2. don’t use petroleum or lube near it (flammable)
3. don’t drop the tank

Question 8

How does supp O2 work?

Answer 8

creates a reservoir of O2 that can be inhaled during inhalation

this increases FiO2 which increases PAO2

Question 9

What is difference between pulsatile and continuous flow?

Answer 9

1. continuous- portable O2 but has shorter duration
2. pulsatile- O2 is given right at consent of inhalation, longer conservation of tank, not as effective with activity as continuous

Question 10

What are the numbers regarding a nasal cannula and FiO2?

Answer 10

Normal- 21%
1 L/min= 24 %

then goes up by 4% until its reached 6 L/min and 44%

Question 11

What happens after 6 L?

Answer 11

nasal cannula is ineffective as the reservoirs are filled up

do not use long tubing as this also decreases effectiveness

Question 12

What are characteristics of face mask for supp O2?

Answer 12

used for mouth breathers, inaccurate FiO2 but estimated at 40-55%

easy to set up, usually need over 4 L

Question 13

What are characteristics of shovel mask?

Answer 13

designed for patients who are unable to tolerate other systems, possibly due to burn or surgery

inaccurate measure of FiO2 as no facial seal

Question 14

What is a venturi mask?

Answer 14

always seen on hospital wall, given specific amount of oxygen due to adaptors/colors

good for mouth breathers and pts who need higher FiO2

Question 15

What are the available values of FiO2 with venturi mask?

Answer 15

24%, 28%, 31%, 35%, 40%, 50%

Question 16

What is an oxygen rebreather mask?

Answer 16

delivers 55-80% of FiO2

bag must stay inflated in order to keep CO2 available for ventilation

used usually for pneumothorax not much else