PT-Vent Synchrony Flashcards
Flow asynchrony is a result of what?
The flow provided by the ventilator being inadequate to match the patient’s inspiratory demand.
Missed triggering and delayed triggering are normally a result of what?
Auto-PEEP.
Auto-triggering is normally a result of what?
Circuit leaks or fluid moving back and forth in the ventilator circuit, but can also be caused by hyperdynamic contractions of the myocardium.
Why can volume ventilation be expected to cause the most asynchrony?
Because it controls volume, flow, and time.
How can a Trigger Delay be modified?
Minimizing Auto-Peep, Apply PEEP, Decrease minute volume/tidal volume, Appropriately set sensitivity, or you may need to replace the ventilator.
What causes Auto-triggering?
Circuit leaks, Water in the circuit, Inappropriately set sensitivity, and Hyperdynamic cardiac contractions.
What causes Double Triggering?
Inadequate tidal volume, short inspiratory time, and an inappropriate mode of ventilation.
In what mode of ventilation is asynchrony most likely?
Volume Assist-Control.
In volume ventilation, what three things can the ventilator control?
Volume, flow and time.
In pressure ventilation, what two things can the ventilator control?
Pressure and time.
What are some potential causes of auto-triggering?
Condensation in the tube, or a leak.
In what mode of ventilation is cycle asynchrony more common?
Pressure ventilation.
What mode of ventilation can be the most problematic because the respiratory center of the brain cannot distinguish between mechanical and spontaneous breaths?
SIMV/PS.
In order to prevent flow asynchrony on pressure ventilation, the Respiratory Therapist should do what?
Adjust the rise time.
In order to prevent flow asynchrony in volume ventilation, the Respiratory Therapist should do what?
Increase the peak flow and decrease the inspiratory time, or change to decelerating flow waveform.
