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3. Description of the Ventilation
Modes
The ventilator has the ability to be used as either a
pressure controlled, volume targeted ventilator, as a
pressure limited, time cycled ventilator, and the
SLE5000 as a high frequency oscillation ventilator.
3.1 CPAP (with a flow sensor)
Continuous Positive Airway Pressure
The ventilator generates a continuous positive
airway pressure at a level set by the User. The
apnoea alarm will sound if the patient has not made
any breath attempts within the set apnoea period.
User sets the following:-
• CPAP
• Apnoea alarm time
• Backup breaths ON or OFF
• Manual breath parameters (Ti and PIP)
• O
2
%
• Flow breath detection threshold (Trigger
Sensitivity) – The patient effort required for the
ventilator to recognise the breath
• High and low pressure alarm thresholds
• Tidal volume, high and low alarm thresholds
• Minute volume, high and low alarm thresholds
3.1.1 CPAP with Apnoea Backup
This is as for basic CPAP mode but if the patient
does not make a breath attempt within the Apnoea
time then a pressure limited, time cycled backup
breath is provided.
The user turns ON the backup breaths function.
3.1.2 CPAP with TTV
plus
(Targeted Tidal Volume)
for Backup Breaths.
This is as for basic CPAP with Apnoea Support,
where the inspiratory pressure shall be controlled by
the ventilator to achieve the user set Vte.
The User sets the following:-
• Enables Targeted Tidal Volume (TTV) and
selects volume to be delivered (Vte)
• Max PIP
3.2 CPAP (without a flow sensor)
The ventilator generates a continuous positive
airway pressure at a level set by the User.
User sets the following:-
• CPAP
• Apnoea Alarm ON/OFF
• Manual Breath parameters (Ti and PIP)
• O
2
%
• High and low pressure alarm thresholds
See “CPAP Mode without a Flow Sensor and with
the Apnoea alarm set to “OFF”” on page 68 of the
“Operational Considerations” chapter for information
on disabling the Apnoea alarm and action to be
taken.
Warning: If apnoea alarm is disabled when
the ventilator is used in CPAP mode without a
flow sensor, the ability for the ventilator to
deliver backup breaths is also disabled.
Backup breaths are disabled as they require
the Apnoea alarm to be triggered. Manual
breaths can still be delivered.
When the Apnoea is turned “OFF”, an
alternative method of detecting an apnoeic
episode must be used. The ventilator will not
alarm or provide mechanical backup breaths.
Note: The Apnoea alarm is automatically
enabled when the flow sensor is connected
and calibrated or if the user leaves CPAP
mode and enters any other ventilatory mode.
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