Principles of operation
152 Instructions for use Carina SW 3.2n
SPN-CPAP/PS
Spontaneous – Continuous Positive Airway Pres-
sure/Pressure Support
Spontaneous breathing with continuous positive
pressure level and with or without pressure support
During spontaneous breathing on PEEP level, the
patient can be supported with
Δ
Psupp. Every in-
spiratory effort of the patient on PEEP level that
meets the trigger criteria triggers a pressure-sup-
ported breath. The time, number, and duration of
pressure-supported breaths is determined by the
patient's spontaneous breathing.
As in all pressure-controlled ventilation modes, the
tidal volume supplied depends on the difference in
pressure
Δ
Psupp, the lung mechanics (resistance
and compliance) and the patient's respiratory drive.
The pressure rise from the lower pressure level
PEEP to the upper pressure level Psupp is defined
with the Ramp setting.
214
Paw
Flow
t
t
PEEP
Spontaneous breathing with pressure support
Slow
pressure rise
Fast
pressure rise
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