Nasal versus oronasal masks: Advantages and disadvantages

Variables	Nasal	Oronasal	Full face
Comfort	+++	++	+
Claustrophobia	+	++	+++
Rebreathing	+	++	++
Lowers CO₂	+	++	++
Permits expectoration*	++	+	+
Permits speech^¶	++	+	+
Permits eating^Δ	+	–	–
Function if nose obstructed	–	+	+
Air leak	+++	+	+

+: possible; ++: most likely; +++: very likely; –: not possible.
* Expectoration is possible but requires the assistance of a respiratory therapist with oronasal mask.
¶ Speech is possible but may vary depending on the degree of respiratory failure.
Δ Eating necessitates oronasal mask removal and may be contraindicated in patients with severe respiratory failure.

Reproduced with permission from: Liesching T, Kwok H, Hill NS. Acute applications of noninvasive positive pressure ventilation. Chest 2003; 124:699. Copyright © 2003 American College of Chest Physicians.
Updated 2020.

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Nasal versus oronasal masks: Advantages and disadvantages