10.8.2 Important considerations
• Pressure Support is not intended for use in
conjunction with administration of muscle
relaxants or high doses of opiates.
• It is important to set a lower and upper
alarm limit for expired Minute Volume.
• Should the patient’s inspiratory time exceed
2.5 s (Adult) or 1.5 s (Infant), inspiration will
be terminated (valid also for PS Backup).
• If the Pressure Support Level above PEEP
is set to zero, the system maintains the
PEEP level during the breaths.
• Discrepancies in gas concentrations
between the patient’s inspiration and
expiration depend on the patient’s uptake.
• If the PEEP is set to a high level, the patient
will have difficulty triggering the breaths.
10.8.3 Backup Ventilation
Pressure support backup ventilation is
controlled by the backup respiration rate
(Backup RR) and PC above PEEP parameters.
If no breath is detected within the specified
backup frequency, a pressure controlled
breath is administered and the alarm 'Backup
ventilation' (low priority) is activated.
Refer to Chapter 5, page 95, for a description
on ventilation parameters.
The minimum backup pressure level is
5 cmH
2
O when setting 'PC above PEEP'.
If no breath is detected (identified by changes
in CO
2
concentration) within the set apnea
time, the apnea alarm (high priority) is
activated. The apnea alarm deactivates and
replaces the backup ventilation alarm.
The apnea time is set in the alarm profile
window, see Chapter 10 page 187. Apnea time
depends on the patient category as follows:
• Infant patient category: 5-45 seconds
• Adult patient category: 15-45 seconds
224
FLOW-i 4.2, User's Manual
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