OPRHT70 A0310
10-2
10
Explanation of Modes and Controls
Entries for tidal volume, respiratory rate, i time and Low Paw alarm
limit are all inactive in SPONT mode. However, users can preset
these parameters for future A/CMV or SIMV operation.
As with all HT70 operating modes, Backup Ventilation is activated if
the BUV linked alarm is violated.
NIV
(Non Invasive Ventilation)
The HT70 can be used for noninvasive ventilation in all modes. Press
the NIV button on the left side of the touch screen to toggle On
noninvasive.
When NIV is On, the following features are activated to assist with
noninvasive ventilation:
o Bias flow is increased to 10 L/min.
o The Low Minute Volume alarm can be turned off in the Alarms
screen
o The Low Pressure alarm can be set closer to the base
pressure (1 cmH2O /mbar above baseline)
PS
(Pressure Support)*
Pressure Support (PS) only functions during patient triggered
spontaneous breaths in SIMV and SPONT modes. During each
spontaneous breath, the ventilator supports the patient by elevating
the airway pressure to the Pressure Support + PEEP level. Breaths
are terminated when (1) flow to the patient drops to the Expiratory
Threshold % setting of that breath’s peak flow rate, or (2) the target
airway pressure is exceeded by 3 cmH2O (mbar), or (3) after the
maximum PS i time setting has been reached. Maximum airway
pressure never exceeds the High P alarm limit setting.
* Not available on all models
PC
(Pressure Control Ventilation)
The HT70 targets and maintains patient airway pressure at the set
pressure control level throughout inspiration. Breath termination
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