Maquet SERVO-air, Руководство пользователя

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5.6 Pressure Support (PS)/CPAP
Pressure Support (PS)/CPAP:
• is initiated by the patient, who controls the
respiratory rate and tidal volume
• delivers ventilator support using the preset
pressure level and with a decelerating flow
• provides backup (PC) ventilation in case of
apnea
Continuous Positive Airway Pressure
(CPAP):
• is initiated by the patient and works exactly
like PS except that the Pressure Support
level is set to zero
• maintains positive pressure in the airways
at all times
• is effectively a spontaneous breathing mode
with continuous positive pressure to keep
the airways open
PS is thus a patient-initiated breathing mode
in which the ventilator system supports the
patient with a set constant pressure.
The ventilator system provides this constant
preset pressure when activated by patient
effort. The patient determines the frequency
and duration of the breaths, which have a
decelerating flow pattern. Duration of
inspiration can be adjusted with the help of
the End inspiration setting.
CPAP may be seen as a special case of PS in
which the inspiratory pressure level is set to
zero and is used when the patient is breathing
spontaneously.
1 2 3 4
5 6
8 9 10
7
The following parameters are set:
1. Oxygen concentration (%)
2. PEEP (cmH
2
O)
3. PS above PEEP (cmH
2
O) (PS level)
4. End inspiration (%)
5. Inspiratory rise time (s)
6. Trigger
7. Apnea time (s)
8. Backup respiratory rate (b/min)
9. Backup PC above PEEP (cmH
2
O)
10. Backup I:E or T
i
(s)
Refer to section Settings on page 43.
The higher the preset inspiratory pressure level
from the ventilator system, the more gas flows
into the patient. As the patient becomes more
active, the PS level may be gradually reduced.
Always set the apnea time that is appropriate
to the individual patient situation. If the apnea
alarm limit is reached, the ventilator system
will automatically switch to backup ventilation
(PC).
The alarm should alert staff to take action by
either returning to a supported mode or
changing to a controlled mode of ventilation.
SERVO-air Ventilator System v2.2, User's Manual
67
| Ventilation modes | 5 |