Treaton MV200, User Manual

Page: 68 / 222

4.7 Setting of ventilation modes and parameters
4-20
that the time of expiration can be significantly longer than the time of inspiration. There is no
limitation of the expiratory time regarding the minimum I:E ratio, it can reach a value of 1:99.
•
PEEP – positive end-expiratory pressure. In BiSTEP and APRV modes Plow parameter
functionally corresponds to the PEEP parameter.
•
V
Т
– tidal volume. At changing of V
Т
minute volume MV and initial flow Flow are changed
simultaneously. Other parameters (respiratory rate, inspiration and expiratory time) are not
changed.
•
Tinsp – inspiratory time. Changing of the Tinsp parameter is made due to expiratory time
Texp and I:E ratio and does not change the respiratory rate. Control limit of Tinsp for some
modes can be changed in [Menu]
→
[Ventilation parameters]
→
[Tinsp limit].
• Tplat – plateau time is duration of the plateau relative to inspiratory time. It is set in percent
or seconds depending on the setting of parameter [Menu]
→
[Ventilation parameters]
→
[Plateau time].
•
FormFlow – flow waveform (rectangular or decreasing).
•
Ftrig (Ptrig) – flow (pressure) trigger sensitivity. Trigger sensitivity determines the minimum
value of the patient's respiratory effort required to run the algorithm of spontaneous
inspiration support. In the flow trigger [Menu]
→
[Ventilation parameters] there is an
additional criterion “Trigger Vinsp 25ml”, which eliminates missing of breaths with very low
rate of the flow increasing. Breath is activated by the accumulation of 25 ml tidal volume
during 0.5 s.
•
PS
– support pressure of spontaneous breath. If the newly set inspiration support pressure
plus PEEP exceeds the maximum allowable pressure Pmax, then the PS and PEEP
background will be painted in red and the application of parameters will be forbidden.
In the
BiSTEP mode PS parameter is used to support spontaneous breaths only on the low
pressure phase Plow. At high pressure phase support pressure is fixed at 5 cmH
2
O to
prevent barotrauma.
• Pi – inspiratory pressure. If the newly set inspiratory pressure plus PEEP exceeds the
maximum acceptable pressure Pmax, then Pi background will be painted in red and the
application parameters will be forbidden.
•
Vapnea
– tidal volume in the apnea mode. It is regulated similarly to V
Т
.
•
Tapnea – time of transition to the apnea mode after detection of the respiratory arrest.
•
Piapnea – inspiratory pressure above apnea PEEP level in the apnea mode.
•
RBapnea – respiratory rate in the apnea mode.
•
Phigh (Plow) – pressure value in the high (low) pressure phase (in the BiSTEP, APRV
modes).
•
Thigh (Tlow) – time of the high (low) pressure phase (in the BiSTEP, APRV modes).
•
Fsupp – support flow (base flow).
•
ETS – expiration trigger sensitivity - percentage of peak inspiratory flow at which the device
switches from inspiration to expiration in the respiratory cycle with pressure support.
Increasing of parameter results in the earlier termination of inspiration and allows to complete
breath normally when there is a leakage in the circuit.
Do not set without a special reason very high sensitivity of the inspiratory
trigger (Ftrig < 3 lpm or Ptrig < 3 cmH2O) because it increases the probabili-
ty of autotriggering or false triggering due to movements of the circuit,
acoustic noise, patient’s movements, etc. In this case triggering will be in-
itiated by the system itself, and not by the patient.