97
10.12.5 V-SIMV
V-SIMV - Volume controlled synchronized intermittent mandatory
ventilation
Description:
In V-SIMV, the respiratory rate, tidal volume
and inspiratory flow or inspiratory time or
ratio are set, as well as the trigger criterion
for the occurrence of ventilator triggering by
the patient.
This mode allows the ventilator to apply
predetermined preset cycles in sync with the
patient's inspiratory effort.
Mandatory cycles occur in the pre-
determined window of time (the onset of
inspiration occurs according to the pre-
established
respiratory
rate),
but
synchronized with the patient's trigger.
If there is apnea, the next cycle will be
triggered by time until the patient's inspiratory
incursions return.
The transition between inspiration and
expiration in the mandatory cycles occurs
after release of the pre-set tidal volume at
given velocity through the flow (or ratio or
inspiratory time). In spontaneous cycles,
cycling (transition between inhalation and
expiration) occurs by flow as it falls to a
certain percentage of its maximum reached
value.
In order to obtain the IMV in this mode,
simply deactivate the support pressure by
setting the support pressure equal to zero
(ΔPS = 0) or the flow and pressure
sensitivities, equal to zero.
Adjusted Parameters:
•
VOLUME
•
RATE
•
FLOW or RATIO or INS TIME
•
PEEP
•
O
2
CONCENTRATION
•
FLOW WAVE FORM
•
PAUSE (%)
•
PRESSURE TRIGGER
•
FLOW TRIGGER
•
ΔPS (Support Pressure)
•
RISE TIME
•
FLOW CYCLING (% FLOW)
•
LIMIT PRESSURE
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.
