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V-SIMV - Volume controlled synchronized intermittent mandatory
ventilation
Once all ventilation parameters are set in the ventilator, it calculates the T
INSP
and T
EXP
in function of
Flow, Pause, Wave and Rate, thus obtaining all ventilation control times.
1. It represents a cycle of VCV (volume controlled) with inspiratory pause;
2. Represents a spontaneous breathing cycle WITHOUT SUPPORT PRESSURE;
3. It represents a VCV (volume controlled) cycle after the SIMV period;
4. Represents a spontaneous breathing cycle WITH SUPPORT PRESSURE, whose cycling occurs
by flow, as soon as it falls to a certain percentage of its maximum reached value.
5. The percentage of peak flow at which inspiratory phase cycles to the expiratory phase is
programmable. Rise time (T
RISE
) is also applied to support pressure (see PCV).
6. If the patient performs inspiratory effort, at the end of the SIMV (TSIMV) period there is a window
for synchronization of the controlled ventilation cycle, which is 'open' from 0.75 x TSIMV, that is,
in the last quarter of the period SIMV opens a synchronization window of the mandatory ventilation
cycle. The information on which trigger type triggered the inspiratory cycle is reported in the
message and status area of the screen.
•
Adjusted support pressure (ΔPS) is a value above PEEP. Therefore, the inspiratory
pressure of support will be the sum of PEEP and ΔPS.
•
The default values are initial reference only.
