Hoffrichter CARAT II pro, User Manual

Page: 101 / 202

Chapter 5: Ventilation modes 101
Using SMART Function
The inspiration trigger is not initiated by artefacts.
Δ t
Δ T
t (s)
V (ml)
Volume curve
Trigger activity
t (s)
Trigger threshold
Triggering
Suppression
false triggering
Trigger threshold
V (ml)
Artefacts Spontaneous breathing
 Trigger by patient (spontaneous breathing)
Figure 45: Inspiration trigger using SMART Function
If the "SMART Function" is active, the device distinguishes between patient efforts
and artefacts.
An inspiration trigger is initiated according to the following conditions:
A time period
∆ T is calculated depending on the IPAP and starting with the expi-
ration period. If the inspiration trigger threshold is reached, an additional IPAP-
dependent time period
∆ t is calculated. If a patient effort meets the trigger con-
dition within this time period ∆ t, an inspiration trigger will initiate. If this is not the
case, the device supposes an artefact and an inspiration trigger will not initiate.
After the time period
∆
T has expired, an inspiration trigger is immediately initiated
after exceeding the trigger thresholds.
If an auto trigger is occurred although the SMART Function is active, we
recommend to increase the trigger level or to set a trigger lock.