ResMed Elisee 350, Clinical Manual

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25/102 Ventilation
NOT013281-8
Spontaneous ventilation
The Elisée 350 has two spontaneous ventilation modes:
•
Standard pressure support (PS mode)
•
Pressure support with minimum tidal volume (PS.V
T
mode).
Both modes include apnea ventilation as backup ventilation for the patient, in the event that the
patient stops triggering spontaneous breaths.
Pressure support (PS)
Pressure support is a targeted, pressure-controlled mode which supports the patient’s
spontaneous breathing. The beginning, end and duration of each cycle, as well as the respiratory
rate, are determined by the patient. Cycles can be triggered either by the patient (through the flow
or pressure trigger) or by the user (by pressing the Manual breath button).
Inspiratory phase
The start of each cycle is triggered by the patient. Once it has detected an inspiration, the Elisée
350 pressurises the inspiratory circuit to reach the set pressure. The time it takes to reach this
pressure depends on the rise time setting. The peak flow delivered by the ventilator also depends
on this setting.
During the pressure maintenance phase, the flow is delivered and adjusted according to the
patient’s needs and the resistance and compliance of the patient’s respiratory system.
In Pressure Support mode, you can also set an apnea time , at the end of which the ventilator
switches to apnea ventilation (backup ventilation) if the patient does not trigger a cycle. This
apnea ventilation may be either barometric or volumetric, depending on the setting option
selected.
Exiting apnea ventilation:
During apnea ventilation, the patient can trigger additional assisted controlled ventilation cycles.
On the fourth consecutive patient-triggered cycle, the ventilator returns to pressure support
mode.
The adjustable parameters are as follows:
•
In volume-controlled mode: the apnea time (Tapnea), the tidal volume (V
T
), the respiratory
rate (F), and the inspiratory time (Ti) (or max or I:E)
•
In pressure-controlled mode: the apnea time (Tapnea), the inspiratory pressure (Pi), the
respiratory rate (F), and the inspiratory time (Ti).
Note:
The trigger and PEEP settings for pressure support apply to apnea ventilation.
PS PS
Ti Max Ti Max
Rise time Rise time
Inspiratory pressure and flow triggers Inspiratory pressure and flow triggers
Expiratory trigger Expiratory trigger
Tplateau FiO
2
FiO
2
Adjustable parameters (SIMV) Adjustable parameters (PSIMV)
°
V