鼻部气道的限流节段

The Flow-limiting Segment(FS)of the Nasal airway

通过鼻测压法和鼻翼肌肌电图检查对鼻部气道的限流节段（ｆｌｏｗ－ｌｉｍｉｔｉｎｇｓｅｇｍｅｎｔ，ＦＳ）进行了研究。发现正常成人ＦＳ的位置在距前鼻孔２．５ｃｍ的范围内，其产生的鼻气道阻力（ＮＡＲ）约占总ＮＡＲ的７８．８％。产生ＮＡＲ的最主要部位在距前鼻孔缘平均约１．７５ｃｍ处。正常人鼻翼肌随呼吸运动发生等长收缩，以此维持鼻翼部气道稳定不变。当ＦＳ结构受损或发生异常时可严重影响ＮＡＲ，产生鼻阻塞。临床上诊断和治疗鼻阻塞时应注意ＦＳ病变，鼻科手术时亦应注意保持ＦＳ诸结构的完好性，以维持正常的鼻通气功能。

A modified anterior rhinomanometry and electromyography of the alar muscle were in-troduced to investigate the site and function of the FS.It was determined that the FS was confined to the area of nasal pathway 2.5 cm in length from the nostril.The location and limitation of this region,which accounted for 78.8% of overall nasal airway resistance, could not be altered by topical vasoactive agents.The most resistive site in the FS averaged 1.75cm distant from the nostril In noimal subjects alar muscles constricted isometrically during respiration so as to keep the vestibular airway stable. On the contrary,the deformities and abnormalities of the FS could obliterate the nasal aimay easily,lead. ing to the symptom of nasal obstruction,Clinically,it is imperative to pay much attention to lesions in the FS in the diagnosis and treatment of nasal stuffiness. Furthermore,it is essential to protect the struc-tural integrity of the FS in the daily rhinosurgery.