107
P
lim
Reached alarm
In volume modes, if the airway pressure in three consecutive breaths approaches the level of
the pressure alarm but does not pass, then a Plim Reached alarm is activated.
Pressure, flow and volume curves in VCV mode
Example: In the figure above, the VCV mode is set to a decelerating flow waveform with an
adjustable volume of Vt = 500 mL and a pressure alarm level equal to Palarm = 20 cmH2O. If the
airway pressure approaches the alarm limit, the device will prevent the pressure from increasing, but
the inhalation phase will continue. However, if for any reason the airway pressure exceeds the alarm
limit, the inhalation phase immediately terminates and atarts the exhalation phase.
Warning
Note that if this alarm is activated, less volume may be delivered to the patient.
Continuation of the Plim Reached alarm may cause harm to the patient due to
reduced delivery volume.
Note:
Airway pressure depends on factors such as device settings, airway resistance and lung
capacity.
Pressure
alarm limit
Pressure adjustment
time by the device
Alarm activation and
termination the
inhalation phase
