Respiratory Flashcards
Hypercarbia
Retention of CO2
Are you breathing fast or slow with hypercarbia?
Slow
Loss of sensitivity to high levels of CO2
CO2 narcosis
New onset of crackles/decreased breath sounds
Absorption atelectasis
Which O2 delivery device doesn’t provide enough flow to meet total oxygen and air volume?
Nasal cannula
Nasal cannula flow rate
1-6 L/min
Nasal cannula O2 concentration
24-44%
Why doesn’t a flow rate of >6 increase O2 with NC?
Because anatomical dead space is full
What device won’t increase RR or depth?
NC
Simple facemask flow rate
Minimum of 5 L/min
FIO2 of simple facemask
40-60%
Partial Rebreather flow rate
6-11 L/min
Partial rebreather FIO2
60-75%
Exhaled tidal volume with partial rebreather
1/3
Highest O2 level device
Non-rebreather
FIO2 with non-rebreather
> 90%
When is a non-rebreather used?
For unstable pts who will soon be intubated. If they are requiring that much FIO2 they will wear out.
High flow O2 devices FIO2 and flow rate
24-100% at 8-15 L/min
Best device for chronic lung dz
Venturi mask
Which device delivers precise O2 concentration?
Venturi mask
How do pts on venturi mask eat?
Switch to NC
Why are T pieces used most often?
To ensure humidification
Noninvasive positive pressure vents
BiPAP & CPAP
-Keeps alveoli open to improve gas exchange w/out airway intubation
What is BiPAP used for
To keep someone from being intubated or right after they’re extubated