iVent201 Operator's Manual
275
E.4 Apnea Back-Up Ventilation
Apnea back up ventilation can be activated from all breathing modes. Visual and
audible indicators will 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 will be 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 averaging 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 table below.
Table E-1: Parameters for Apnea Ventilation
Set/Average
Inhale VT
bpm Tidal Volume
(for CPAP)
(mL) (bpm) (mL)
71-120 30 100
121-170 25 150
171-250 20 200
251-350 18 300
351-450 16 400
451-550 14 500
551-650 12 600
650+ 12 700
The ventilator will remain in apnea backup ventilation until the patient initiates 3
consecutive breaths within a 1 minute time period and will then return to the
previous mode automatically. (The unit will not exit from apnea ventilation during
the first minute.) The operator may restore previous ventilation parameters or
make appropriate adjustments at any time.
During apnea ventilation, all parameters appear in gray so all adjustments must
be make through the Modes Selection window.
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