6-20
In PRVC-SIMV mode, you can set the following sigh function parameters as required:
1. [Sigh]: Switch for turning on sigh function
2. [Interval]: Time interval between two sighs
3. [Cycles Sigh]: Number of sigh cycles
4. [△int.PEEP]: PEEP added in sigh cycle
6.5.10 DuoLevel
DuoLevel is dual level positive airway pressure ventilation mode. In DuoLevel mode, the
ventilator delivers positive airway pressure at two pressure levels alternatively during
mechanical ventilation or spontaneous breathing. The patient can breathe spontaneously at
either pressure level. During the low pressure phase, pressure support can be set. Trigger
window is available during both high and low pressure phases, during which triggered
transition to the other pressure level occurs. The trigger window during the low pressure
phase is the later 5 seconds of low pressure time (Tlow), while the trigger window during the
high pressure phase is the later 1/4 of high pressure time (Thigh). Within the trigger window
of low pressure phase, inspiratory trigger transforms to high pressure gas delivery. Within the
trigger window of high pressure phase, expiratory trigger transforms to low pressure gas
delivery.
Trigger window is a period of buffer time for patient’s synchronization inspiration. The
period is in the later expiration phase of the mechanical ventilation. The trigger window is 5 s
long for adult and 1.5 s long for pediatric while simultaneously it cannot exceed the
expiratory time.
The following figure shows typical waveforms in DuoLevel mode.
Paw
Time
Phigh
Trigger
window
Trigger
window
Thigh
PSV
Tslope
Thigh
Plow
Tlow
Trigger
window
Insp. trigger
Exp.trigger
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