5.10 Bi-Vent/APRV
Bi-Vent:
• is a time-cycled, pressure-limited mode that
allows spontaneous breathing throughout
the entire ventilatory cycle;
• has two time-cycled pressure levels and
switches between these two levels. The
patient can breathe spontaneously at both
these levels and it is possible to give
Pressure Support at both levels.
APRV:
• stands for Airway Pressure Release
Ventilation;
• is a time-cycled, pressure-limited mode that
allows spontaneous breathing throughout
the entire ventilatory cycle;
• alternates between two levels of positive
airway pressure, with the main time on the
high level and a brief expiratory release to
facilitate ventilation;
• differs from Bi-Vent in that it uses an inverse
I:E ratio.
The following parameters are set:
1. Pressure high (PHigh) for the higher
pressure level (cmH
2
O)
2. PEEP for the lower pressure level (cmH
2
O)
3. Oxygen concentration (%)
4. Time at the higher pressure (THigh) level
(s)
5. Time at the lower pressure (TPEEP) level
(s)
6. Inspiratory rise time (s)
7. Trigg. Flow / Trigg. Pressure
8. End inspiration (%)
9. PS (Pressure Support level) above PHigh
(cmH
2
O)
10. PS (Pressure Support level) above PEEP
(cmH
2
O)
SERVO-s VENTILATOR SYSTEM V8.0, User's Manual
87
| Ventilation, modes and functions |
5 |
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