airway equipment

Question 1

O2 Delivery Systems:

• Low flow 02 delivery systems:
• High flow delivery systems:

Answer 1

Low flow 02 delivery systems:
-depend on RA entrainment to meet pt’s peak inspiratory and minute ventilation demands

High flow delivery systems:
-deliver O2 at rates above the normal inspiratory flow rate and maintain a fixed FiO2 regardless of the pt’s inspiratory flow and breathing pattern and by using devices that entrain a fixed proportion of RA

Question 2

Low flow O2 Delivery systems:

• devices
• FIO2 range of systems:
• *NC
• *simple face mask
• *Partial re-breather
• *NRB
• *Trach collar

Answer 2

Devices:
nasal cannulas, simple face masks, and reservoir mask deliver O2 @ rates below the normal pt inspiratory flow rate

-the pt draws in RA along with the supplemental oxygen, so the true FiO2 can’t be determined and can vary greatly

FIO2 Range (21-90%):

-NC: 21-44%

• Simple FM: 30-60%
• *Fresh gas flow (FGF) 5-8L/min below 5L/min-rebreathing. Above 8L/min- no increase in FiO2
• Partial re-breather- above 60%
• *reservoir bag with 600-1000cc capacity, has side ports, FGF-8L/min or above
• NRB- 80-90%:
• *adds unidirectional valves: 10-15L/min FGF
• Trach collar:
• FIO2 unpredictable

Question 3

Items to consider with manual resuscitation bags: (6)

Answer 3

1. high resistance to flow due to non-rebreathing valve
2. pt should not breathe spontaneously through bag
3. small deadspace volume
4. different bag compliance (from anesthesia bag)
5. bulk of non-rebreathing valve close to pt connection- a lot of weight on ET tube, rigid connection to ET tube
6. Will deliver RA without an O2 connection

Question 4

Most O2 delivery systems are non-rebreathing:

Answer 4

inspiratory gas is not made up in any part by the exhaled tidal volume