正常人通常选择鼻呼吸,鼻部有表面受体可感知气流和压力的变化,进而调节上气道扩张肌的活动,而后者是维持上气道开放的主要力量。研究表明,张口呼吸者阻塞性睡眠呼吸暂停低通气综合征(OSAHS)的发生率较鼻呼吸者高[1]。虽然张口可使咽腔口径减小,但口部气流对上气道动力学的作用 Normal people usually choose nasal breathing, nasal surface receptors can be perceived changes in air flow and pressure, and then regulate the activity of the upper airway dilator, while the latter is to maintain the main force on the airway opening. Studies have shown that the incidence of obstructive sleep apnea-hypopnea syndrome (OSAHS) in mouth-opening respirators is higher than in nasal respirators [1]. Although the mouth can reduce the pharyngeal caliber, but the mouth air flow on the upper airway dynamics