5.4.3 Patient Mode
The Vivo 45 can be operated in either Adult mode or Paediatric mode.
In Paediatric mode, some ventilator parameters, for example Breath Rate, Inspiratory
Time and Target Volume have special setting limits, in order to optimize the treatment
for paediatric patients. The settings and alarm limits of the Vivo 45 are reset to default
values when the patient mode is altered.
5.4.4 Ventilation and Breath Modes
The ventilation and breath modes are used for controlling the ventilation treatment with
the ventilator. The ventilation mode selected can be either Pressure, or CPAP.
Pressure mode is used in combination with the Support, Assist/Control or MPV breath
mode.
The following combinations of ventilation and breath modes can be selected for the
Vivo 45:
• PSV (Pressure Support Ventilation). May be combined with:
– TgV (Target Volume)
– AE (Auto-EPAP)
• PCV (Pressure Controlled Ventilation). May be combined with:
– A (Assist function — inpiration trigger)
– TgV (Target Volume)
– AE (Auto-EPAP)
– MPV (Mouthpiece Ventilation)
• CPAP (Continuous Positive Airway Pressure)
5.4.4.1 Pressure Support Ventilation (PSV)
In the PSV mode, the patient’s spontaneous breathing is assisted by the ventilator. The
patient controls the start of inspiration through the inspiratory trigger and the start of
exhalation by the expiratory trigger.
The set pressure is used as a target pressure, if the flow is decreased to the expiratory
trigger level before the set pressure is reached, the expiration starts.
When an inspiration is started, either when the patient triggers a breath, or when the
backup rate setting initiates an inspiration in case of a prolonged Apnea, the ventilator
delivers a flow up to a certain preset pressure limit. In case of a patient initiated breath,
the patient continues the breath for as long as they wish and cycle off when a percentage
drop in peak inspiratory flow (expiratory trigger) has been reached.
Spontaneous breaths stop and an exhalation starts in three cases:
• The inspiration flow has dropped to the value set for expiratory trigger.
• The inspiration time is longer than the limit for maximal inspiration time or when
inspiration time reaches 3 seconds.
62 How to Use the Vivo 45
Vivo 45 User manual
Doc. 006149 D-3
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