624074/07 B-19
T high short relative to the time at the lower pressure level, the
modes look more like P-SIMV, with spontaneous breaths fol-
lowing mandatory breaths. If you set the breath cycle time to
a total of 7.5 to 15 seconds with just enough time at the low
level to allow full or near-full exhalation, these modes look like
classical APRV. By setting PEEP/CPAP / P low and P high equal to
one another and adjusting other parameters, the modes can
be made to resemble SPONT.
B.5.3.4 Pressure support in DuoPAP/APRV breaths
Pressure support can be set to assist spontaneous breaths in
DuoPAP/APRV, whether they occur at the PEEP/CPAP / P low or
P high level. Psupport is set relative to PEEP/CPAP / P low – the
target pressure becomes PEEP/CPAP / P low + Psupport.
This means spontaneous breaths at the P high level are sup-
ported only when this target pressure is greater than P high.
Figure B-13 (a) shows the situation where breaths at both the
P low and P high level are pressure-supported. Figure B-13
(b) shows the situation where only breaths at the PEEP/CPAP/
P low level are pressure-supported.
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