C Autions; Dditional Nformation - ResMed Ultra Mirage Clinician Manual

c
autions
• The mask is not for use with ventilators which
have a combination of:
a) little or no ability to compensate for mask leak
and variation in mask leak (eg volume-cycled
ventilators with no compensation for leak, or
pressure-cycled ventilators which are unable
to deliver adequate extra flow in the presence
of increased leak); and
b) no expired ventilation alarms.
If a ventilator with poor leak compensation is
used, special reliance is placed on the expired
ventilation alarm.
• As with all mask ventilation systems, significant
leak may occur between the mask and the
patient's face. The leak may vary depending
on such factors as the patient's position and
sleep stage. Variation in leak may significantly
affect patient ventilation, potentially producing
profound hypoventilation or hyperventilation.
The magnitude of this effect depends on the
ventilator's ability to compensate for leak.
• Leak or variation in the leak may cause
mistriggering of the ventilator.
• Increased face-to-mask leak will reduce effective
deadspace by washing out expired gases. In
a pressure-cycled ventilator which tolerates
moderate leak, the effect may be a reduction in
arterial PCO with no change in ventilator settings.
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a i
dditional nforMation
ResMed has tinted the U
•
and elbow blue to help you identify it as a non-
vented mask for use with active-exhaust non-
invasive ventilator systems only.
• The mask elbow has a standard female 22mm
tapered fitting (ISO5356-1) for external connection
to the ventilator.
• In determining the initial ventilator settings, and
in particular the tidal volume for volume-cycled
ventilators, make appropriate allowances for mask
deadspace and leak, both directly from the mask
itself (primarily at the elbow-mask frame junction),
and between the face and mask. Refer to the Mask
Characteristics section for more information.
• Refer to the relevant ventilator system operating
instructions for detailed information concerning
connecting the mask.
M NV M
frame
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