OPRHT70 A0310
10-3
Explanation of Modes and Controls
10
occurs when (1) the set i time elapses, or (2) Paw exceeds the
Pressure Control setting by 8 cmH
2O (mbar). Maximum airway
pressure won’t exceed the user set High P alarm setting.
The target airway pressure for pressure controlled mandatory breaths
in A/CMV and SIMV is the display setting above ambient pressure,
not above PEEP.
Both time and patient triggered mandatory breaths can be delivered
in A/CMV and SIMV Pressure Control operation. During SIMV
Pressure Control operation, patients can breathe spontaneously
between mandatory breaths with or without pressure support.
When disconnecting the patient circuit during PC/PS ventilation,
i.e. for suctioning, the flow may increase in order to compensate for
the low pressure. After reconnecting the patient circuit, the flow will
automatically readjust to meet the patient’s demand.
VC
(Volume Control Ventilation)
During Volume Control ventilation, tidal volume can be set for
mandatory breaths. If a volume setting is changed while the ventilator
is operating, the change takes place in increments over a series of
breaths.
When tidal volume is adjusted, inspiratory time remains constant and
mandatory flow changes.
If an attempted tidal volume setting results in a flow rate in excess of
100 L/min or less than 6 L/min, flow adjustment ceases, the user is
alerted by an audible beep and a message appears in the Message
Display Window. To allow further volume adjustment, change the i
time to set the Flow to meet the patient’s need.
Backup Ventilation
Backup Ventilation activates when the currently linked alarm occurs.
This function can be linked with the Low Minute Volume (MVI) alarm,
the Apnea alarm, or both alarms. During Backup Ventilation the
linked alarm(s) will sound and the message window will indicate that
Backup Ventilation is in use. There are default Backup Ventilation
parameters, but the user may adjust these in the Advanced Screen.
Backup Ventilation is functional in all modes.
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