Tecme NEUMOVENT, Technical Manual

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TECHNICAL AND MAINTENANCE MANUAL
Graph VENTILATOR
Review : 04
Date: 09/05/06
16
Airway Pressure Release Ventilation
(APRV)
It is a mode which ventilates applying periodic switching between two adjustable
levels (P-high and P-lower) of continuous positive airway pressure (CPAP) during
preset periods of time.
Spontaneous breathing is possible without restriction at both levels. The two levels of
positive pressure, alternating to intervals of time selected by the operator, produce
intermittent distension and passive decompression of the lungs. At the same time, and
so much during the upper or lower level, the patient can breathe spontaneously with or
without pressure support. It can by apply in ADL and PED category.
Specific Controls for the APRV mode:
PEEP/CPAP:
The default values are of 5 and 0 cm H
2
O for P-high and P-
lower CPAP, respectively. In the screen, the first value appears in the normal
place of PEEP/CPAP. The second appears under the previous one.
To change the CPAP values the [PEEP/CPAP] key it is pressed once to
modify the high value or twice for the lower, with change of the number to
inverse video. With the key [
×
] of
Selection
sector it can be increased or
decreased the value, accepting with [Enter]. The low value can be same but
not bigger that the high.
Ti:
This key completes a double function by means of which it can be adjusted
the time value of the high and lower CPAP pressure period. The values for
default are 5 and 1.5 seconds respectively. In the screen, the values appear
one above the other one in the place that corresponds at the Inspiratory Time.
To change the time values the [Ti] key should be pressed one or twice,
enabling the number of the high or low time respectively. With the key [
×
] of
Selection sector it can be increase or decrease the value, accepting with
[Enter].
PSV - Rise Time:
During the period of high and low CPAP, the patient can
have spontaneous ventilation with or without pressure support. As default
there is 5 cm H
2
O of pressure support but it can be changed from 0 to 50 cm
H
2
O.
Sensitivity:
Key to regulate the trigger sensitivity during the spontaneous
breathings. For default, the sensitivity is for flow of 3 L/min.
Backup Ventilation
Backup ventilation is a mode intended to guarantee ventilation in patients when there
is a decrease in the breathing effort or episodes of apnea during spontaneous
ventilation modes.
The warning signal, when the apnea alarm is activated, is audible and visual, and
repeats every ten seconds during five seconds. This signal is accompanied with a
message in the screen and activation of the light of apnea alarm.
This mode is of obligatory programming when some spontaneous ventilation form is
selected, as being Pressure Support, SIMV in its two forms, MMV and PSV with VT
Assured. In this way, the backup programming will offer security to the patient in case
the ventilator does not detect signal of pressure or flow to begin an inspiratory phase.
However, in SIMV it is possible to opt for the deactivation of the backup function.