
Mask leak can also result in noise and mask removals during sleep. This causes dryness, and also prevents CPAP from keeping the upper airway open. When a patient sleeps with their mouth open, the pressure from the CPAP leaks out the mouth. Mouth breathing is another mask-related factor to consider.A mask fitting is advised when patients start treatment, and several fittings may be needed.
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There are many mask sizes and types, including nasal masks that fit over or under the nose, nasal pillows that fit in the nostrils, full face masks that cover the mouth and nose, hybrid masks that sit under the nose and cover the mouth, and even helmet masks that cover the face. If the mask does not fit, the treatment may not work well. Cognitive behavioral therapy or short-term use of sleep medications can help people adjust to CPAP.

noise from the machine bothering the patient or their bed partner.pressure intolerance, from either too much pressure or not enough pressure trouble exhaling against the CPAP pressure or swallowing air (aerophagia).dryness, especially waking with a dry mouth.
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While there are many patients who love their CPAP machines and report the treatment to be life-changing, and are unable to sleep without CPAP, there are others who learn to accept and tolerate CPAP because they appreciate either the functional benefits (such as better mood and less daytime sleepiness) or medical improvements they get from using the device. Most sleep doctors, myself included, recommend that patients with sleep apnea use their treatment whenever they sleep, in order to derive optimal benefit. The effectiveness of CPAP depends on using the device correctly and consistently, since OSA is a chronic disease that requires long-term treatment. When used consistently, and when treatment is effective, CPAP improves daytime sleepiness, quality of life, and it can have positive impacts on cardiac and metabolic health. CPAP is recommended by the American Academy of Sleep Medicine (AASM) as the initial treatment for moderate or severe OSA, and in mild cases of OSA when associated with insomnia, disrupted sleep, or excessive daytime sleepiness. CPAP involves wearing a mask that fits into the nostrils, underneath or over the nose, or over the nose and mouth, through which pressurized air is delivered via tubing from a machine to keep the upper airway open during sleep. Continuous positive airway pressure, or CPAP, is the most common treatment prescribed for obstructive sleep apnea (OSA).
