understanding of ventilators
- related: ICU intensive care unit, Pulmonology
- tags: #permanent
- source: Murray and Nadel Ch 135 Mechanical Ventilation, design features of modern mechanical ventilators
Ventilator things
- ATC is automatic tube compensation.: adjust pressure/flow based on ET tube diameter.
- flow vs pressure limits
Parameters of ventilation
Modes of ventilation
- basic modes of ventilators
- APRV ventilation
- assist control ventilations are modern CMV ventilators
- NAVA senses phrenic nerve for ventilation
Cycle Desynchrony
- premature cycling is caused by high trigger sensitivity or low inspiratory time
- delayed cycling caused by low trigger and high inspiratory time
Flow Desynchrony
- changing ventilation target from flow to pressure can help with flow starvation
- flow desynchrony can happen with air hunger
Trigger Desynchrony
- ineffective trigger asynchrony
- reverse triggering is when patient initiates 2nd breath
- double triggering is when patient initiates both breaths
- adding inspiratory hold to improve double triggering
Others
Resistance = Peak P - PEEP
Increase flow rate decreases resistance (may not see on pressure curve anymore)
Normal compliance = 80-100 cc/cmH2O
Resistance = (dynamic - static pressure) / flow rate
Rc = Ppeak - Ppleateau cmH2O / flow L/S
Normal = < 2 cm H2O/L/sec for no intubated patient and < 10 for intubated patient
Go up on flow rate to 60L/min to start out
Increase Ti for double trigger.
Pressure flow and volume graphics over time with pressure control ventilation at baseline, under increased resistance conditions (increased Raw), and under reduced compliance conditions (decreased Crs).
Links to this note
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- related: understanding of ventilators
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changing ventilation target from flow to pressure can help with flow starvation
- related: understanding of ventilators
-
premature cycling is caused by high trigger sensitivity or low inspiratory time
- related: understanding of ventilators
-
- related: understanding of ventilators
-
- related: understanding of ventilators
-
adding inspiratory hold to improve double triggering
- related: understanding of ventilators
-
assist control ventilations are modern CMV ventilators
- related: understanding of ventilators
-
calculating driving pressure in pressure support mode
- related: understanding of ventilators
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delayed cycling caused by low trigger and high inspiratory time
- related: understanding of ventilators
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- related: understanding of ventilators
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- related: understanding of ventilators
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APRV has less sedation and paralysis
- related: understanding of ventilators
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- related: understanding of ventilators