Operator’s Manual LTV
®
Series ventilator Page 3-1
p/n 10664, Rev. Y
Chapter 3 -
B
REATH
T
YPES
This chapter contains information regarding the breath types available on the LTV
®
Series ventilator.
It covers how breaths are initiated, limited and cycled, and when each type of breath is given.
The following terms are used in discussing how breaths are given:
Initiate
What causes a breath to be given. Breaths may be initiated by a patient trigger, a
push of the manual breath button, or by the ventilator based on the set breath rate
and ventilation mode.
Limit
How the breath is controlled. Breaths may be limited to a maximum circuit pressure
or flow.
Cycle
What causes the breath to be cycled from the inspiratory phase to the exhalation
phase. Breaths may be cycled by the ventilator when a set time or delivered volume
has been reached, or when an alarm condition such as a high pressure limit has
been reached. Spontaneous breaths are terminated when the flow based on patient
demand decreases to 10% of the maximum flow delivered during the breath, or
below 3 Lpm.
Breath Types
Breaths are defined by how they are initiated, limited and cycled. The breath types are Machine,
Assist, and Patient.
Machine
Assist Patient
9
Initiated By - Ventilator Patient Patient
Limited By - Ventilator Ventilator Ventilator
Cycled By - Ventilator Ventilator Patient
Breaths may be given in any of the following forms: Volume Control, Pressure Control, Pressure
Support and Spontaneous. These breaths are given as described in the sections below.
In addition, the following parameters apply to all breaths:
• The Minimum Inspiratory Time is 300 ms.
• The Minimum Exhalation Time is 346 ms.
• When patient triggers are enabled, triggers are detected during exhalation after the Minimum
Exhalation Time has expired.
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Pressure Support or Spontaneous
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