form pressing a key. The airway pressure is represented dynamically by an analogical bar
graph.
The numeric values exhibited below and to the right of the screen are those programmed by
the operator. Those of the superior and left part are resulting values.
Some values have small characters, as the indication of high and low alarm limit of VT.
Others are remarkable as the high and low-pressure limit.
The mode in use is shown with highlighted video inverse characters. Above the mode in use
appears, when it is programmed, the sigh and/or pauses indication.
Likewise, the screen shows messages indicating an alarm state or to execute some action.
Respiratory cycle
The process of insulation of gas to the lungs by means of the mechanic ventilation with the
NEUMOVENT Graph Ventilator comprises four steps:
1) Start of inspiratory phase
2) Progression of inspiration
3) End of inspiration
4) Expiratory phase
Start of inspiratory phase
The beginning of the inspiration can be automatic (for action of the respiratory frequency
control) or for the patient's initial inspiratory effort. In the first case the ventilation will be of
controlled type and in second assisted type.
Pressure breathing curves where is pointed out the beginning and the end of
the inspiratory phase.
For selection of assist/control ventilation the Volume (VCV) or Pressure (PCV) modes are
used. The spontaneous ventilation includes, in this ventilator, the Pressure Support (PSV)
mode and its combinations, where the patient begins and ends the inspiration according to
he/she demand.
The inspiratory effort that triggers the inspiratory phase modifies the pressure of the
breathing circuit or it produces variation of a continuous flow in the same circuit. In both
cases the system is regulated by means of the Inspiratory Sensitivity control.
From the mechanical point of view, the closing of the expiratory valve and the opening of the
flow of gas mixture toward the breathing circuit and the patient characterize this stage.
Progression of inspiration
The duration of this stage depends on the time during which comes out flow of the ventilator
toward the breathing circuit and the patient, while the expiratory valve remains closed.
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