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Oronasal mask
The function of an oronasal mask (Figure 7-2) is essentially the same as a nasal mask.
oronasal mask: A mask that cov-
ers the nose and mouth. It is used It has a soft cushion that surrounds and makes contact with the patient’s nasal and
in noninvasive positive pressure oral area. As does the nasal mask, the soft cushion also provides comfort to the patient
ventilation.
while maintaining a seal to keep gas from leaking. With an oronasal mask, a tight
seal is easier to maintain than with a nasal mask because both the nose and mouth
Regurgitation and are covered. However, because the mouth is covered, regurgitation and aspiration can
aspiration can be a potential
problem when an oronasal be potential problems with the use of an oronasal mask. Asphyxiation can also occur
mask is used. in the event of ventilator failure, or electrical or gas source disconnection. Anti-
asphyxia valves provide a safety opening in these situations. Proper disconnection
alarms and patient monitors must be functional during the use of NPPV via an oro-
With an oronasal mask, nasal mask. Table 7-5 shows the advantages and disadvantages of the oronasal mask.
asphyxiation can also be
a problem in the event of Some patients may benefit from a total face mask which covers the eyes, nose, and
ventilator failure, or electrical
or gas source disconnection. mouth. Total head interface is also available for patients who may have trouble with
leaks or proper fitting of other interfaces.
Nasal Pillows
nasal pillows: Nasal pillows are a Nasal pillows (nasal prongs) is another interface that resembles a nasal mask
small interface commonly used for but is smaller. Nasal pillows devices are more commonly used during CPAP
CPAP therapy.
therapy. This interface consists of two small cushions that fit snugly within the
nostrils. Because nasal pillows do not come into contact with the lips, chin or
Used with permission by Philips Healthcare
Figure 7-2 An oronasal mask in use.
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