ResMed Astral Series Clinical Manual page 174

Setting
P control max
Patient type
PEEP
PIF
PS
PS Max
Pt Height
Resp. rate
Rise Time
Safety Vt
Sigh Alert
Sigh Breath
Target Pt Rate
Target Va
Ti
Ti Max
Ti Min
Trigger
Trigger type
Vt
Definition
Maximum allowed pressure control (P control max) sets the maximum pressure control
above PEEP allowed to achieve the target safety volume.
Select from Adult or Paediatric. This setting configures the default values and ranges
available for ventilation settings and determines circuit resistance acceptance criteria
applied in the Learn Circuit.
Positive End Expiratory Pressure (PEEP) sets the pressure maintained during exhalation.
Peak Inspiratory Flow (PIF) sets the maximum delivered flow for volume controlled
breaths.
Sets the pressure support above PEEP to be delivered during inspiration for pressure
supported breaths (spontaneous breaths).
Maximum allowed Pressure Support (PS Max) sets the maximum pressure support above
PEEP allowed to achieve the target safety tidal volume.
Patient Height (Pt Height) is used to estimate the patient's anatomical deadspace and
Ideal Body Weight (IBW).
Respiratory rate (Resp. rate) sets the breaths per minute (bpm) to be delivered by the
ventilator to the patient. The measured respiratory rate may be greater due to patient
triggered breaths.
Rise time sets the time taken for the ventilator to reach inspiratory pressure for pressure
controlled breaths.
Safety tidal volume sets the target minimum tidal volume (Vt) for each ventilator
delivered breath.
Sigh alert sets whether the ventilator gives a single beep just prior to delivery of a sigh
breath.
Sigh Breath sets whether a magnified breath (a sigh breath) will be delivered at the sigh
interval.
Target Patient Rate (Target Pt Rate) sets the upper boundary for the iVAPS intelligent
Backup Rate (iBR).
Target Alveolar Minute Ventilation (Target Va) sets the servo-ventilation target for
iVAPS.
Inspiration time (Ti) sets the duration of the inspiratory phase of a breath.
Maximum inspiratory time (Ti Max) sets the maximum duration of the inspiratory phase
of a breath.
Minimum Inspiratory Time (Ti Min) set the minimum duration of the inspiratory phase of
a breath.
Sets the trigger threshold above which the ventilator triggers a new breath.
The trigger is blocked for the first 300 ms following the start of exhalation.
Trigger type sets whether a pressure based trigger threshold or flow based trigger
threshold is used when a Double circuit is selected.
The Tidal Volume (Vt) sets the volume of gas, measured in mL, to be delivered to the
patient in a mandatory controlled volume breath.
Appendix A: Definitions
English 167