Care, Maintenance, and Tests
270
Figure E-1: Breath Pattern in Assist/Control Mode
At the beginning of the breath cycle (event a), the ventilator delivers a ventilator
breath. After the ventilator breath is delivered, the patient does not attempt to
trigger an assist breath. The ventilator then waits for the normal breath period
(60/bpm) to elapse and delivers another ventilator breath (event b). An
insufficient inspiratory effort (event c) has no effect on the normal delivery of
mandatory ventilator breaths. After delivering the third ventilator breath (event
d), patient effort reduces the airway pressure below PEEP (pressure triggering)
or generates initial inspiratory flow (flow triggering) by an amount equal to or
greater than the operator-selected value for sensitivity (event e). Therefore, an
assist breath is initiated (event f). This resets the breath cycle, thus breath rate is
increased. If the patient does not initiate an assist breath during the next breath
cycle, the ventilator delivers a ventilator breath at the end of the normal breath
cycle.
E.1.4 Parameters Setting
The following parameters may be set:
• Breath Rate (bpm)
• O
2
%
• Tidal Volume
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