Ventec Life Systems V-Home - Understanding Volume Breaths

Breath Types and Therapy Modes
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Volume Breaths
Mandatory and assist breaths are delivered as volume breaths in volume ventilation modes. Volume breaths deliver the
set Tidal Volume over the set Inspiratory Time. Airway pressure is a function of patient lung resistance and compliance.
NOTE: Delivery of volume breaths to patients with extremely high airway resistance (e.g., 200 cmH2O/L/s) and lung
compliance requires high circuit pressure, which may cause the High Pressure alarm to activate before the target tidal
volume is reached.
The set Tidal Volume and Inspiratory Time determine the peak ow (limited to 120 L/min). The nal ow will be 50% of
the peak ow, unless peak ow is below 20 L/min. When peak ow is below 20 L/min, the nal ow will be 10 L/min.
Volume breaths cycle at the end of the set Inspiratory Time.
Spontaneous Breaths
Spontaneous breaths are initiated and cycled by the patient. Depending on the set Ventilation Mode, spontaneous
breaths will be delivered at a set IPAP (in Bi-Level and Spontaneous modes) or at a set Pressure Support (in SIMV modes).
Spontaneous breaths cycle at the set Flow Cycle percentage of peak ow, or at the Time Cycle setting, whichever is
reached rst.
Flow
Set
Inspiratory
Time
Set
Inspiratory
Time
Airway
Pressure
Initial flow is
<20 L/min
Initial flow is
>20 L/min
50% of
initial flow
10 L/min
Breath cycles at set
Inspiratory Time