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• Insufficient pressure support alarm
Is triggered if for 3 breaths in a row the maximum mask pressure achieved at
inspiratory to expiratory transition is either <87.5% of the absolute mask
pressure targetted at that point, or < absolute mask pressure targeted minus
1 cm H
2
O, whichever is the lower.
• High leak alarm
Leak exceeds 30 L/min for more than 20 seconds.
• Flow blocked alarm
Flow is less than 6 L/min for more than 20 seconds.
IEC 601-1 classifications
Class II, Type CF
Class II medical electrical equipment provides protection against electric shock
either by double insulation or reinforced insulation and does not require a
protective ground.
Inspiratory Trigger Characteristics
The inspiratory trigger occurs at a flow greater than 0 LPM when tested with
EPAP=5 cm H
2
O, IPAP=15cm H
2
O, sinisoidal breath shape. The inspiratory
trigger response time is <600 ms when tested with EPAP=5 cm H
2
O,
IPAP=15 cm H
2
O, 0.67 L/sec inspiratory and expiratory flow rate. The time is
measured from the beginning of inspiratory flow to the beginning of pressure
rise to IPAP.
Note: The ASV algorithm is designed to treat a patient with essentially normal
lungs. Hence, trigger response is less sensitive and pressure ramp-up is more
gentle than typical non-invasive ventilators.
Table 3: Displayed values
Value Range Accuracy Display Resolution
Proximal cuff
Pressure -3 to 40 cm H
2
O0.5 cm H
2
O 0.1 cm H
2
O
Mass flow
sensor
Leak 0–99 L/min +/- 12 L/min 1 L/breath
Respiratory rate 8–30 breaths per minute +/- 10% 1 breath per minute
Tidal volume 0–4500 mL +/- 10% 1 mL
Minute
ventilation
0–40 L/min +/- 10% 0.1 L/min
Target MV 0–40 L/min +/- 10% 0.1 L/min