Viva Crash Course Flashcards
Phases of breath delivery/variables:
- Trigger (how it begins)
- Control or target (preset)
- Cycling (how it ends)
Common triggers:
- Time trigger
- Flow trigger
- Pressure trigger
Control variable
Defines which aspect of inspiration is the primary variable controlled by the ventilator during inspiration
(pressure and flow)
What is a trigger variable?
Variable which determines when a ventilator initiates a machine-driven breath
2 control variables:
- Flow
2. Pressure
Calculate compliance
Compliance= ^Volume/ ^Pressure
3 Cycling variables:
- Flow
- Volume
- Time
3 breath types:
- Mandatory
- Assisted
- Spontaneous
Describe mandatory breaths (trigger/support)
Triggered by the ventilator with full level of support
Describe assisted breaths (trigger/support)
Triggered by the patient, either full support or partial support
Describe spontaneous breaths (trigger/support)
Non-triggered and no support
Tidal volume
Volume of each breath
Respiratory rate:
I:E Ratio
The ratio of inspiratory time to expiratory time
Fi02
The fraction of inspired oxygen delivered on inspiration to the patient