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APNEA BACK-UP VENTILATION
Apnea back up ventilation can be activated from all breathing modes. Visual and
audible indicators indicate an apnea event if breathing has ceased for a period of
time determined in the Alarms Settings window (the default value is 20 seconds.)
When apnea is detected the patient is ventilated in the current ventilation mode
except for CPAP. Rate is determined according to set Tidal volume for volume
control, for all other modes the rate is based on an average of the previous
inhaled tidal volumes. The average is calculated based on the twelve breaths
(whether spontaneous or mandatory) prior to the apnea event. (see table below) .
In CPAP the unit switches to SIMV volume control mode with rate and Tidal
volume according to the following table.
The ventilator remains in apnea backup ventilation until the patient initiates 3
consecutive breaths within a 1 minute time period and then returns to the
previous mode automatically. (The unit does not exit from apnea ventilation
during the first minute.) The operator can restore previous ventilation
parameters or make appropriate adjustments at any time.
During apnea ventilation, all parameters appear in gray so all adjustments must
be made only after restoring the previous ventilation mode.
OPEN LOOP MODE
The Open Loop mode is an emergency backup mode designed for short-term
ventilation. Open Loop is used as a safety mode in the event of ventilator circuit
or sensors failures. While in Open Loop mode, the iVent
reference to the flow sensor data.
When the open Loop mode is activated a Warning message is displayed allowing
to restore to the last ventilation mode or to go to Standby mode (Figure 173).
Table 16: Parameters for Apnea Ventilation
Average VT
bpm
Range
(mL)
(bpm)
50-90
30
91-120
25
121-175
20
176-245
18
246-315
16
316-385
14
386-455
12
456+
12
229
Appendix E: Ventilation Modes
Tidal Volume (for CPAP)
(mL)
70
105
140
210
280
350
420
490
201 ventilates without
TM
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