Management of Sudden Onset Dry Mouth with PAP Therapy

Primary Causes

The American Academy of Sleep Medicine recommends that unintentional mask leaks, particularly mouth leaks when using nasal masks, and inadequate humidification are addressed to prevent dry mouth in patients using Positive Airway Pressure (PAP) therapy 1, 2, 3
Mouth leak, when using a nasal mask, can cause significant dryness of oral tissues, as pressurized air escapes through the mouth 1, 2
Mask leak, due to a poor fit between the mask and face, allows air to escape, increasing mouth dryness by disrupting the humidity balance 2, 3
Inappropriate mask type, such as using a nasal mask in patients who are mouth breathers, can lead to significant mouth dryness 4

Lack of humidification can lead to dryness of the mouth, throat, and nasal passages, and the American Academy of Sleep Medicine suggests using heated humidification with PAP therapy 4, 5
Inadequate humidification settings can cause dry mouth, even with humidification, if settings are too low for the individual's needs or environmental conditions 5, 6

A sudden increase in leak without a pressure change should alert the clinician to a possible increase in mask or mouth leak, according to the American Academy of Sleep Medicine 1
Unacceptable leak is defined as one that is substantially higher than the leak recorded at a given pressure from a well-fitted, secured interface 2
The trend in leak is often more informative than the absolute leak value, as noted by the American Academy of Sleep Medicine 7

Assessing for mask leaks involves checking mask fit and adjusting or replacing if necessary, as recommended by the American Academy of Sleep Medicine 1, 2
Optimizing humidification includes adding heated humidification to the PAP device if not already in use, and increasing settings as needed, according to the American Academy of Sleep Medicine 4, 5, 6
Adjusting PAP settings, such as considering pressure adjustments if high pressures contribute to mask leaks, may be necessary, as suggested by the American Academy of Sleep Medicine 7

The American Academy of Sleep Medicine advises against assuming dry mouth is normal with PAP therapy, as it often indicates a correctable issue 4, 5
Focusing only on mask type is not recommended, as humidification and pressure settings are equally critical factors, according to the American Academy of Sleep Medicine 4