VARIABLETrigger, limit, cycle, variable
|
VOLUME CONTROLhow it works |
PRESSURE CONTROLhow it works |
TriggerStarts the breath,Changes from expiration to inspiration |
How it triggers?Machine with TimePatient with Flow |
How it triggers?Machine with TimePatient with Flow |
LimitLimits the maximum value a variable can reach during Tiduring inspiration |
How it limits?Volume or flow |
How it limits?Pressure |
CycleEnds the breath,Changes from inspiration to expiration |
How it cycles?Volume or Flow |
How it cycles?Time |
Variable(Expiration Baseline) |
Pressure |
Volume or flow |
How does complianceaffect the mode? |
Volume does NOT changePressure does change! |
Pressure does NOT changeVolume and Flow change! |
How does sensitivity affect the mode? |
With patient Trigger,it can make the breatheasier or more difficult |
With patient Trigger,it can make the breatheasier or more difficult |
The 4 phases of a breath |
Explanation |
Phase Variable designation |
Change from expirationto inspiration |
Trigger |
Inspiratory |
Inspiration |
Limit |
Inspiratory |
Change from inspirationto expiration |
Cycle |
Expiratory |
Expiration |
VariableAka baseline |
Expiratory |
Ti (Inspiratory Time) |
Te (Expiratory Time) |
Controlled by flow |
Controlled by frequency and rate |
Modifies PaO2 |
Modifies PaCo2 and Ve |
If flow is increased,Ti will get shorter.Means pt gets the flow faster. |
If flow is increased,Te will get longer.Means pt will have longer to exhale. |