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Appendix D
49
Glossary of Terms
Assist
Respiratory assist mode, whereby a subject is aided in regaining normal breathing after
artificial respiration (weaning), or for respiration of a non-paralyzed, anesthetized sub-
ject. Ventilation is triggered when the device detects a slight vacuum in the airway.
Expiration
The process of breathing out (exhaling) a gas or gasses.
Flow Rate
The rate of gas flow, expressed in L/min or mL/min.
I:E Ratio
The ratio of inspiration to expiration times. As used in this context, however, it is
expressed as the percent of inspiration time to total respiration period. An I:E Ratio of
1:1 is equivalent to 50% inspiration time. An I:E Ratio of 1:4 is equivalent to 20% inspi-
ration time.
Inspiration
The process of breathing in (inhaling) a gas or gases.
Inspiration Pressure
The pressure to which the subject's lungs are inflated during inspiration.
PEEP
Positive End-Expiratory Pressure.
Residual Volume
The smallest volume to which the subject's lungs can slowly be deflated.
Respiration Rate
Breathing rate, expressed in breaths per minute (BPM).
Sigh
A deeper than usual breath, which expands the lungs to a greater capacity and redis-
tributes the lung surfactant that tends to puddle in the alveoli during normal respira-
tion.
Sigh Volume
The inspiration volume during a sigh breath (some percentage greater than normal
tidal volume for the subject).
Sigh Pressure
The inspiration pressure during a sigh breath (some percentage greater than normal
inspiration pressure for the subject).
Publication 5404-001-REV-C
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