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A CT scan showing evidence of the nasal cycle: the more patent airway is on the right of the image, the swollen turbinates congesting the left. The nasal cycle is the subconscious [1] [2] alternating partial congestion and decongestion of the nasal cavities in humans and other animals.
Aspiration pneumonia: Particles entering the lungs can cause infections. [8] Structural changes: Repeating obstruction or trauma may scar or narrow the upper airway. This is called subglottic or tracheal stenosis. [9] [page needed] Voice changes: Chronic damage to the vocal cords may cause permanent voice changes or loss. [1] [page needed]
Nasal obstruction characterized by insufficient airflow through the nose can be a subjective sensation or the result of objective pathology. [10] It is difficult to quantify by subjective complaints or clinical examinations alone, hence both clinicians and researchers depend both on concurrent subjective assessment and on objective measurement of the nasal airway.
Obstructive sleep apnea (OSA) is the most common sleep-related breathing disorder and is characterized by recurrent episodes of complete or partial obstruction of the upper airway leading to reduced or absent breathing during sleep.
The typical screening process for sleep apnea involves asking patients about common symptoms such as snoring, witnessed pauses in breathing during sleep and excessive daytime sleepiness. [19] There is a wide range in presenting symptoms in patients with sleep apnea, from being asymptomatic to falling asleep while driving. [19]
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