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With optimal PSV, the breathing pattern can be standardised (by increasing the Vte
and reducing the respiratory rate) and the work of breathing can be reduced,
improving the respiratory exchange ratios.
In this mode the patient's work of breathing is assumed by the ventilator. Each
breath initiated by the patient (Trig I activated) is supported by the ventilator, that
sends a gas flow inside the airway, at a certain pre-set pressure, called support
pressure (PS).
The other parameters available in PSV determine:
•
Trig E (%), is the percentage of inspiratory flow peak beyond which the
expiratory act can start.
•
Ti min (s), minimum duration time of the inspiratory phase; the patient cannot
breathe out before this time.
If the patient does not require spontaneous breathing during the
apnoea time (set in MAIN MENU - SETUP), the system activates the
APNOEA acoustic and visual alarm.
The system will automatically provide an APCV ventilation with set
safety respiratory rate (RR bk) and I:E ratio (I:E bk).
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User's Manual, version DU3300105
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