LTV 1150 - Page 300

Page B-4 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
TERM DEFINITION
PreSet
A feature allowing ventilator parameters to be “preset” for an infant,
pediatric, or an adult patient.
Pressure Control Breath
A machine or assist breath where the circuit pressure is elevated to a
user-set pressure for a user-set period of time. Pressure Control
Breaths have an optional flow termination criteria.
Pressure Support Breath
A patient breath where the circuit pressure is elevated to a user-set
pressure and maintained there until flow decreases to a user-set
percentage of the peak flow achieved. Pressure Support Breaths
81
may
also be terminated by a user-set maximum time, or by exceeding 2
breath periods.
Pressure Trigger
A patient effort in which the proximal airway pressure dropped to, or
below the set Sensitivity setting. A pressure trigger will result in delivery
of an Assist or Patient breath, according to the ventilation mode.
PSIG
Pounds per Square Inch Gauge. A unit for measuring pressure. 1 PSIG
= 0.7 bar.
rpm
Revolutions per minute. A unit for measuring turbine speed.
Scrolling, Monitor Data
Display
Allows the user to display the monitored values statically or
automatically scroll them. While scrolling is active, each monitored
value will be displayed for 3 seconds then the next value will be
automatically displayed.
SIMV
Synchronized Intermittent Mandatory Ventilation.
SIMV Mode
A mode of ventilation where a minimum number of Machine or Assist
breaths are given, and the patient is allowed to trigger additional Patient
breaths. Available Breath types are Volume Control, Pressure Control,
Pressure Support, and Spontaneous.
Spontaneous Breath
A breath which the patient starts and cycles. Spontaneous breaths are
cycled at 10% of peak flow, set variable time termination, or when they
exceed 2 breath periods.
Spontaneous Breathing
Trial (SBT)
A ventilation mode used to temporarily minimize ventilatory support and
perform clinical assessments of a patient’s dependence on, or ability to
be removed from positive pressure ventilation.
Tidal Volume, monitored
( Vte )
The exhaled volume measured at the patient wye. Exhaled Volume is
measured for all breath types.
Total Breath Rate,
monitored (f)
The quantity of breaths given per minute; includes all breath types.
Transducer
An electromechanical device used to measure pressure or flow.
Vcalc
A monitor that displays the calculated peak flow for Volume Control
breaths. Vcalc is calculated based on the set Tidal Volume and the Set
Inspiratory Time.
VE
See Minute Volume, monitored.
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Pressure Control and Pressure Support breaths do not compensate for PEEP. Delivered pressure is controlled
by the Pressure Control setting and is not affected by the PEEP setting. i.e.; A Pressure Control setting of
20cmH
2
O and a PEEP setting of 10cmH
2
O results in a maximum delivered pressure of 20cmH
2
O.