NIV Flashcards
Interfaces for NIV
Huge Prong
Oral nasal
Full face
Nasal
Mouth piece
Leak
Steps to measure tubing CT
Set VT to 100mL
PEEP of 0
Inspiratory hold of 2 sec
High P limit to 12cmH2O
Trigger vent while blocking “Y”
Record plateau
Measure volume
Formula for tubing compliance
VT/Pplate
What is the cycle time
60/RR
Where should you set the flow triggered breath
1-10L/min below base
What works faster, flow triggering or pressure triggering
Flow triggering
Do the exhalation valves close during flow triggered breath
No, it remains open
Where should patient pressure triggered breaths be set
-1 to -2cmH2O
Do exhalation valves close during pressure triggered breaths
Yes, and pressure must drop before inspiratory valve opens
Range for inspiratory flow
40-80L/min
Who should receive a high inspiratory flow
Patients with airway resistance (asthma)
What does a higher inspiratory flow do to Ti and PIP
Shortens Ti
Raises PIP
Who benefits from slower inspiratory flow
Non-homogeneous lungs (ARDS)
What does a slower inspiratory flow do to the Ti and PIP
Ti is increased and can lead to cardiovascular side effects and shorter TE
Reduces PIP
Formula for TI
VT/Vi
ML converts to L
Flow in L/min to L/sec
Formula for Vi
VT/Ti
L (VT) and L/sec (Ti)
Formula for VT only with inspiratory flow and inspiratory time
TI/Vi
Move decimal by 3
Try multiplying
What mode has decelerating flow pattern
Pressure
When is most of the gas delivered when a patient is in decelerating flow pattern
At the beginning of inspiration when the patient need it the most
Benefits of decelerating flow pattern
Increases oxygenation
Decreases dead space
What does the decelerating flow pattern do to pressure
Mean airway pressure is higher
PIP is lower
How much pressure support overcomes WOB
5-15cmH2O
How much PS to overcome ETT
5-8cmH2O
What is the max and minimum PS
5-30
mL/kg range for PSV
4-8mL/kg
What PS indicates ready to get off the ventilator
5-10
Normal Mean airway pressure range
10-15mmHg
(Improves oxygenation)
