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Chapter 3 Modes, Features, and Alarms
39
Spontaneous Expiratory Threshold (Inspiration to Expiration):
A second method used to cycle to expiration during spontaneous
breathing in all modes except T, CV, AC, and SIMV, is called
Spontaneous Expiratory Threshold (SET). The SET rises in proportion
to the inspiratory flow rate on each breath. When the SET and actual
patient flow value are equal, the unit cycles to expiration.
Pressure
Flow
IPAP
EPAP
Spontaneous
Expiratory
Threshold
Flow Reversal (Inspiration to Expiration):
As ow begins to decrease during inspiration, a ow reversal can
occur due to a large leak around the mask or because the patient’s
mouth is open. When the device senses this ow reversal, it
automatically cycles to expiration.
Maximum IPAP Time (Inspiration to Expiration):
The maximum inspiratory time is determined by the adjustment of
the Inspiratory time setting. A maximum IPAP time of 3.0 seconds
acts as a safety mechanism to limit the time spent in inspiration
during spontaneous breathing. For mandatory or assisted breaths,
the maximum inspiratory time will equal the Inspiratory time setting
up to 5.0 seconds.
Spontaneous Expiratory
Threshold