iVent201 Operator's Manual
261
resistance and ventilator circuit compliance and resistance. Inspiratory time is
limited to 3 seconds or a 1:1 I:E ratio based upon the set rate.
During SIMV with a low rate setting, the I:E ratio of all breaths is used to
determine the Adaptive Flow
TM
. For example, if the SIMV rate is set to 5 and the
patient is breathing once between mandatory breaths for a total rate of 10, the
average total cycle time for each breath is 6 seconds. Under these conditions the
ventilator will adjust the inspiratory flow to deliver the tidal volume within 2
seconds (I =2, E =4, I:E =2:4 or I:E =1:2). This assures patients will have a normal
I:E ratio as they change spontaneous breath frequency.
Another feature of Adaptive Flow
TM
is its ability to track and match the
mandatory breath inspiratory flow rate to the patient’s spontaneous inspiratory
flow demand during SIMV. The ventilator constantly monitors the patient’s
spontaneous breath flow rate. If the mandatory breath inspiratory flow is less
than the patient’s average spontaneous inspiratory flow demand, the mandatory
inspiratory flow is increased to the same value to minimize the feeling of “air
hunger” experienced by some patients during mandatory breath delivery.
The Adaptive Flow
TM
value is shown on the display at all times and is depicted
by a circled A symbol next to the peak inspiratory flow value.
Adaptive Flow
TM
can be disabled at any time by manually changing the peak
inspiratory flow control setting. The range for manual peak inspiratory flow is 10
to 120 liters per minute. The flow value for the manually set flow rate the
ventilator will use, is depicted by a circled M symbol next to the peak inspiratory
flow value.
NOTE:
1. When setting a manual inspiratory flow during low flow conditions, this
flow target may briefly over shoot as the ventilator controls the flow to
the patient. However, the average flow will be maintained at the set
value.
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