7 Ventilation modes
LM
T 6
85
41
a 0
6/2
02
1
|
25
7.4 ST mode
In ST mode, fixed values can be set for pressure levels during
inspiration and exhalation. In ST mode (S = spontaneous,
T = timed), the device supports the patient’s ventilation.
The patient can trigger on both inspiration and exhalation.
Both the patient’s spontaneous breathing and the
mechanical breaths triggered by the device may
predominate. If there is no spontaneous breathing, the
device takes over ventilation at the set background
frequency.
The graph shows the currently regulated airway pressure
over time.
7.4.1 Adjustable parameters in ST mode
Trigger
sensitivity on
inspiration
1 – 10
Auto
Set trigger sensitivity here.
1: Highly sensitive
10: Not very sensitive
Auto: Device optimizes trigger sensitivity.
Trigger
sensitivity on
exhalation
95 % – 5 %
Set trigger sensitivity on exhalation here. Triggering is effected
when the following values are reached by maximum flow on
inspiration:
95 %: Highly sensitive
5 %: Insensitive
Target volume
On: 100 ml – 3,000 ml
IPAP max: 4 cmH
2
O to 60 cmH
2
O
Speed: 1 to 3
Speed of modification:
• Level 1: 0.5 cmH
2
O every 8 breaths
• Level 2: 1.0 cmH
2
O every 5 breaths
• Level 3: 1.5 cmH
2
O every breath
Pressure increase
1
2
3
4
Set the speed at which IPAP is reached here:
• Level 1: 100 cmH
2
O/s
• Level 2: 80 cmH
2
O/s
• Level 3: 50 cmH
2
O/s
• Level 4: 20 cmH
2
O/s
Pressure reduction
1
2
3
4
Set the speed at which pressure is reduced to EPAP here:
• Level 1: -100 cmH
2
O/s
• Level 2: -80 cmH
2
Os
• Level 3: -50 cmH
2
O/s
• Level 4: -20 cmH
2
O/s
PARAMETER
ADJUSTABLE VALUES
DESCRIPTION
PARAMETER
ADJUSTABLE VALUES
DESCRIPTION
IPAP
4 – 50 cmH
2
O
Set positive airway pressure on inspiration here.
EPAP
4 – 25 cmH
2
O
Set positive airway pressure on exhalation here.
Rate
2 – 60/min
Set background rate per minute here.
Ti min
0.5 s – Ti max
Set the minimum duration of inspiration for spontaneous breaths here.
Ti max
0.5 s – 4 s
Set the maximum duration of inspiration for spontaneous breaths here.
Ti timed
Auto
0.5 s – 4 s
Set the duration of inspiration for mandatory breaths here.
On Auto setting, the Ti min and Ti max limits also apply to the inspiration
times during background ventilation.
Trigger
sensitivity on
inspiration
1 – 10
Auto
Set trigger sensitivity here.
1: Highly sensitive
10: Not very sensitive
Auto: Device optimizes trigger sensitivity.
Trigger
sensitivity on
exhalation
95 % – 5 %
Set trigger sensitivity on exhalation here. Triggering is effected when the
following values are reached by maximum flow on inspiration:
95 %: Highly sensitive
5 %: Insensitive
