Treatment Functions And Settings; Treatment Modes; Pcv+A - Pressure Controlled Ventilation (Assisted); Psv - Pressure Support Ventilation - Breas Vivo 2 User Manual

4

Treatment Functions and Settings

This chapter describes the modes, settings and parameters that controls the ventilation
of the Vivo 2.
Lay operators must only use the User Manual, not the Clinician's Manual.
4.1

Treatment Modes

This section describes the ventilating modes of the Vivo 2.
4.1.1 PCV+A — Pressure Controlled Ventilation (Assisted)
In PCV+A mode, the ventilation is controlled by set values for pressure, inspiratory
time, and rise time.
The inspiration is started by either of the following triggers:
• The patient actively takes a breath.
• The interval set by the breath rate, if the patient does not actively trigger a breath.
The inspiration stops and the expiration starts by either of the following triggers:
• The inspiration time expires.
• The High Pressure Alarm limit is reached.
4.1.2 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
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
breath 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 percent-
age 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 is longer than the limit for maximal inspiration time or when
inspiration time reaches 3 seconds.
• The limit for the high-pressure alarm is reached.
44 Treatment Functions and Settings
Vivo 2 User's Manual
Doc. 007229 Y-2