LTV 1200 Operator's Manual - AARC.org

Chapter 3 - BREATH TYPES
This chapter contains information regarding the breath types available on the LTV ® 1200 / 1150
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
Limit
Cycle
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.
How the breath is controlled. Breaths may be limited to a maximum circuit pressure
or flow.
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.
Breath Types
Breaths are defined by how they are initiated, limited and cycled. The breath types are Machine,
Assist, and Patient.
Machine Assist Patient 8
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.
8 Pressure Support or Spontaneous
Operator’s Manual LTV ® 1200 / 1150 Ventilators Page 3-1
P/N 19802-001 Rev. F