Spontaneous Breath Management in SIMV and SPONT Modes
Service Manual
A-5
In SPONT, when Volume Target Pressure Control* mandatory breath type is selected (
Volume Target
is on in
Advanced
data set), all spontaneous efforts are assisted by Volume Target Pressure Support.
* not available on the S model
A.3.1
Pressure Support
Pressure Support is available in SIMV and SPONT—Volume Control, BPRV,* and Pressure Control
mandatory breath types only. For patient spontaneous efforts that trigger the ventilator, it delivers
breaths with a constant pressure equal to PEEP/CPAP + Pressure Support. The breaths are delivered
according to the user-selected settings for
Pressure Support
,
Slope/Rise
, and
PEEP/CPAP
.
Pressure-Support breaths are cycled off when one of three thresholds is attained: delivered flow
declines to a set percent (%) of peak flow (user set via expiratory threshold in
Advanced
data set), the
duration of the breath reaches the maximum inspiratory time (2.0 seconds for adult, 1.2 seconds for
ped/infant), or pressure overshoot occurs, whichever comes first.
* not available on the S model
Note:
Reference
for a graphical representation of the pressure overshoot cycling off threshold for
Pressure Support and Volume Target Pressure Support breaths.
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