Page F-4 LTV
®
Series ventilator Operator’s Manual
p/n 10664, Rev. Y
TERM DEFINITION
Pressure support breath
A patient breath where the circuit pressure is raised to an operator-set
pressure and maintained until flow decreases to an operator-set
percentage of the peak flow achieved. Pressure Support Breaths
100
may also be terminated by an operator-set maximum time, or by
exceeding 2 breath periods.
PSIG
Pounds per Square Inch Gauge. A unit for measuring pressure.
rpm
Revolutions per minute. Turbine speed is measured in rpm.
Scrolling, monitored data
display
Displays the monitored values statically or allows for automatic scroll
ing. 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 ventilation mode 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.
Tidal volume, monitored
(Vte)
The exhaled volume quantified 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
A measuring device. Transducers can be used to quantify flow or
pressure.
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.
Volume control breath
A machine or assist breath where a operator-set volume is delivered
over a operator-set time. Flow is delivered in a decelerating waveform
where the peak and final flows are calculated so that the final flow is
50% of the peak flow.
Vte
See tidal volume, monitored.
100
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.
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