Breas VIVO 65 User Manual page 67

PSV – Pressure Support Ventilation
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 exha-
lation by the expiratory trigger.
The set pressure is used as a target pressure, when 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 cycles off when a percentage of 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 has reached the limit for maximal inspiration time or 3 seconds.
• The limit for the high-pressure alarm is reached.
PSV(TgV) – Pressure Support Ventilation with Target Volume
The PSV(TgV) mode acts as the PSV mode but with an added regulation of the pressure.
Target volume is a feature that automatically adapts the pressure to make sure that the ven-
tilator delivers the desired set target volume to the patient. The delivered volume is com-
pared to the set target volume on a breath by breath basis. The delivered pressure for the
next breath will be increased or decreased depending on the difference between the deliv-
ered volume and the set target volume. Automatic pressure adjustments will be made in
between two adjustable limits (min pressure and max pressure) in order to deliver the opti-
mal support to the patient.
See also the section on Target Volume setting above.
PCV – Pressure Controlled Ventilation
In the PCV mode the ventilation is controlled by the ventilator. This is done at the preset
pressure, breath rate, inspiratory time, and rise time settings set by the operator.
The inspiration stops and an expiration starts in two cases:
• The inspiration time expires.
• The limit for the high pressure alarm is reached.
PCV(A) – Assisted Pressure Controlled Ventilation
In the PCV(A) mode the ventilation is controlled by the ventilator, but the patient has the
possibility to start a breath through the Inspiratory Trigger. This patient triggered breath
will be delivered with the inspiratory time, rise time and pressure setting set by the operator.
Doc. 006150 M-1
How to Use the Vivo 65
User manual
65