EvitaXL

Ventilation Modes
BIPAP
As in all pressure-controlled ventilation modes, the patient is
not prescribed a fixed tidal volume (VT).
The tidal volume results principally from the pressure difference
between the settings for PEEP and Pinsp.
Changes in lung compliance and airways, as well as active
breathing by the patient can lead to changes in tidal volume.
This is a desired effect in this ventilation mode.
With the knowledge that the tidal volume, and therefore the
minute volume, are not constant, the alarm limits for minute volume
must be adjusted with care.
The display of the expiratory measured tidal volume VTe must
be used to set the required difference between the two pressure
levels.
As with SIMV, the time pattern is set using the basic setting
parameters of frequency f and inspiration time Tinsp. The
resultant inspiration and expiration times are calculated by
EvitaXL and displayed in the lower half of the screen below the
curve setting. The lower pressure level is set with the PEEP
parameter, while the upper level is set with Pinsp.
When switching over from SIMV to BIPAP mode, and retaining
the time pattern, only the Pinsp setting needs to be changed.
The steepness of the increase from the lower pressure level to
the upper pressure level is controlled by the »Ramp« setting.
The effective time for the increase in pressure cannot become
greater than the set inspiratory time Tinsp.
This precaution ensures that the upper pressure level Pinsp is
reached safely during inspiration. The transition from controlled
ventilation via the weaning phase to fully spontaneous
breathing is achieved by a gradual reduction of inspiratory
pressure Pinsp and/or frequency f.
214 Instructions for Use EvitaXL
Pinsp
PEEP
Paw
trigger
window
mandatory
BIPAP stroke
Pinsp
Tinsp
spontaneous
breathing
spontaneous
breathing time
1
f
synchronisesd
BIPAP stroke
t
022