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10.12.7 CPAP/PS
CPAP / PS - Spontaneous ventilation with positive airway pressure and
pressure support
Description:
In CPAP / PS, the ventilator allows
the
patient
to
breathe
spontaneously,
but
provides
continuous pressurization in both
inspiration and expiration, and
assist ventilation during inspiration
by
maintaining
a
supporting
pressure
until
the
patient's
inspiratory flow is reduced to a
critical
(adjustable)
level
of
inspiratory peak flow reached.
The onset of inspiration occurs
when the patient makes an effort
that is recognized by the ventilator
according to the adjusted trigger. If
the backup is active and the
patient goes into apnea, the onset
of inspiration will occur according
to the set apnea time.
This allows the patient to control
the respiratory rate and inspiratory
time, and thus the volume of
inspiratory air.
Cycle
(transition
between
inspiration and expiration) occurs
by flow as it falls to a certain
percentage
of
its
maximum
reached value.
If the support pressure value
(ΔPS) is set to 0 (ZERO) and the
means for cycle triggering are both
turned off, ventilation with pure
CPAP mode will be activated,
which is a mode of spontaneous
ventilation not assisted by the
ventilator.
The tidal volume depends on the
respiratory effort of the patient and
the
conditions
of
respiratory
mechanics of the lung and chest
wall.
Adjusted Parameters:
•
PEEP / CPAP
•
O
2
CONCENTRATION
•
ΔPS (Support Pressure)
•
CYCLE (% FLOW)
•
RISE TIME
•
PRESSURE TRIGGER
•
FLOW TRIGGER
•
FLOW (NEONATAL)
•
BACKUP
o
VCV Backup
▪
VOLUME
▪
RATE
▪
FLOW
▪
LIMIT PRESSURE
o
PCV Backup
▪
CONTROL
PRESSURE
▪
RATE
▪
INSP TIME
o
PLV-NEONATAL Backup
▪
INSP PRESSURE
▪
RATE
▪
INSP TIME
o
Automatic Backup
(1)
1 - Whenever the set apnea
time is reached, the ventilator
triggers a ventilator cycle, the
setting of which is based on the
current mode settings.
