During expiration, the ventilator continuously
delivers a gas flow (bias flow), which is
measured in the expiratory channel. For details
of the bias flow, see Technical data on
page 151.
At a trigger sensitivity level above zero (0), The
ventilator senses deviations in the bias flow
delivered during expiration. These deviations
are caused by the inspiratory efforts of the
patient. The further to the right on the scale,
the more sensitive is the trigger function.
At a trigger sensitivity level below zero (0), the
ventilator senses deviations in the pressure
below PEEP created by the patient. The
pressure below PEEP required to initiate a
breath is shown when the setting is made. The
further to the left on the scale, the more effort
is required to trigger.
5.3.2 Inspiratory rise time
t
100 %
Time to peak inspiratory flow or pressure at
the start of each breath as a percentage of the
respiratory cycle time or in seconds. Increased
rise time will affect the rate of flow/pressure
increase and can be evaluated by the shape
of the flow and pressure waveforms.
SERVO-s VENTILATOR SYSTEM V8.0, User's Manual
57
| Ventilation, modes and functions |
5 |
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