Specifications

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Chapter 13 Abbreviations/Definitions
Assist Ventilator A device designed to assist a patient’s spontaneous breathing and to
augment ventilation.
Auto-trigger Movement to the IPAP level in the S or S/T modes that was not caused
by patient effort or the BPM control.
BPM Breaths Per Minute. The rate at which the unit will trigger to the IPAP
level in the S/T mode if the patient does not initiate a spontaneous
trigger. The rate at which the unit will cycle to IPAP in the T mode.
CPAP Continuous Positive Airway Pressure. The mode that is delivered when
the Function Selector Knob is in either the IPAP or the EPAP position. A
constant level of pressure that is maintained throughout the patient’s
respiratory cycle during spontaneous breathing.
EPAP Expiratory Positive Airway Pressure. The pressure level that is
maintained during the expiratory phase of the S, S/T, or T modes. The
pressure level that is maintained continuously with the Function Selector
Knob in the EPAP position.
Estimated Leak Flow Rate The Total Flow Rate is analyzed to determine what portion of the flow
through the circuit is due to intentional (i.e., Whisper Swivel II or
Respironics Disposable Exhalation Port) and unintentional (mask fit)
leaks. This continuous flow level is referred to as the Estimated Leak
Flow Rate (V
leak
).
Estimated Patient Flow Rate The Total Flow Rate is measured and the Estimated Leak Flow Rate is
determined. The balance of the flow is due to the instantaneous changes
that occur during patient inspiration/expiration. This is referred to as the
Estimated Patient Flow Rate (V
est
).
Instantaneous Flow Changes in the flow rate through the patient circuit due to
inspiration/expiration.
Intentional Leak Component of the Estimated Leak Flow Rate (V
leak
) caused by flow
through a continuous bleed exhalation port such as the Whisper Swivel
II or the Disposable Exhalation Port.
IPAP Inspiratory Positive Airway Pressure. The pressure level that is
maintained during the inspiratory phase of the S, S/T, or T modes. The
pressure level that is maintained continuously with the Function Selector
Knob in the IPAP position.
%IPAP The percent of the respiratory cycle (the duration of which is set by the
BPM control) that the unit remains at the IPAP level in the
Timed mode.
Abbreviations/Definitions