95
10.12.4 PRVC
PRVC - Pressure regulated volume controlled
Description:
Time-limited, pressure-limited cycling mode
that uses tidal volume as feedback to
continuously adjust the pressure limit.
The first three respiratory cycles are in volume-
controlled mode, allowing the ventilator to
calculate respiratory mechanics. In the next
cycles the ventilation is distributed with
pressure limit and cycled by time to reach 60%
of the adjusted volume. The onset of
inspiration (triggering) occurs according to the
pre-established respiratory rate. The end of the
inspiration and beginning of the expiration
(cycling) happens according to the adjusted
inspiratory time.
At each cycle the ventilator adjusts the
pressure limit (5 cmH2O up) according to the
tidal volume distributed in the previous cycle,
until the tidal volume indicated by the operator
is reached.
The maximum pressure limit is 5 cmH2O
below the pressure limit indicated by the
operator.
Adjusted Parameters:
•
VOLUME
•
LIMIT PRESSURE
•
RATE
•
INSPIRATORY TIME
•
PEEP
•
O
2
CONCENTRATION
•
RISE TIME
•
PRESSURE TRIGGER
•
FLOW TRIGGER
Note: 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.
Once all ventilation parameters are set in the ventilator, it calculates the T
EXP
as a function of Rate and
T
INSP
, thus obtaining all ventilation control times.
