Abstract：
BACKGROUND: No studies have been conducted to define the lengths of the upper airway\'s different segments in normal healthy adults.
OBJECTIVE: This study aimed to determine the length of the subglottis and extrathoracic trachea and the factors affecting it.
METHODS: This was an observational retrospective review study. Included 102 adult patients who underwent CT scan during the quiet inspiration phase of the upper airway.
RESULTS: The results revealed significant positive linear relationships between height and both anterior and posterior subglottic measurements (p < 0.001). Additionally, a statistically significant, moderately strong negative correlation between age and extrathoracic tracheal measurements (p > 0.001) was observed. Men exhibited longer anterior (p < 0.001) and posterior (p > 0.001) subglottic measurements. In both sexes, the average length of the anterior subglottis was 14.16 (standard deviation [SD]: 2.72) mm, posterior subglottis was 14.51 (SD: 2.85) mm and extrathoracic trachea was 66.37 (SD: 13.71) mm.
CONCLUSIONS: We concluded that a normal healthy adult\'s anterior subglottis length is 6.3-19.3 mm (mean: 14.16 [SD: 2.72] mm), posterior subglottis length is 6.1-20.0 mm (mean: 14.51 [SD: 2.85] mm) and extrathoracic trachea length is 25.2-98.5 mm (mean: 66.37 [SD: 13.71] mm). Age, height and sex affected the upper airway length.
OBJECTIVE: This study aimed to determine the length of the subglottis and extrathoracic trachea and the factors affecting it.
METHODS: This was an observational retrospective review study. Included 102 adult patients who underwent CT scan during the quiet inspiration phase of the upper airway.
RESULTS: The results revealed significant positive linear relationships between height and both anterior and posterior subglottic measurements (p < 0.001). Additionally, a statistically significant, moderately strong negative correlation between age and extrathoracic tracheal measurements (p > 0.001) was observed. Men exhibited longer anterior (p < 0.001) and posterior (p > 0.001) subglottic measurements. In both sexes, the average length of the anterior subglottis was 14.16 (standard deviation [SD]: 2.72) mm, posterior subglottis was 14.51 (SD: 2.85) mm and extrathoracic trachea was 66.37 (SD: 13.71) mm.
CONCLUSIONS: We concluded that a normal healthy adult\'s anterior subglottis length is 6.3-19.3 mm (mean: 14.16 [SD: 2.72] mm), posterior subglottis length is 6.1-20.0 mm (mean: 14.51 [SD: 2.85] mm) and extrathoracic trachea length is 25.2-98.5 mm (mean: 66.37 [SD: 13.71] mm). Age, height and sex affected the upper airway length.
摘要：
背景：尚未进行研究来确定正常健康成人上呼吸道不同节段的长度。
目的：本研究旨在确定声门下和胸外气管的长度及其影响因素。
方法：这是一项观察性回顾性研究。包括102名在上气道安静吸气阶段接受CT扫描的成年患者。
结果：结果显示，身高与前声门下和后声门下测量之间存在显着的正线性关系（p<0.001）。此外,具有统计学意义的，观察到年龄与胸外气管测量值之间存在中度强负相关(p>0.001).男性表现出较长的声门下前（p<0.001）和后（p>0.001）测量。在两性中，前声门下的平均长度为14.16（标准偏差[SD]：2.72）mm，后声门下为14.51（SD：2.85）mm，胸外气管为66.37（SD：13.71）mm。
结论：我们得出的结论是，正常健康成年人的前声门下长度为6.3-19.3毫米（平均值：14.16[SD：2.72]毫米），后声门下长度为6.1-20.0mm（平均：14.51[SD：2.85]mm），胸外气管长度为25.2-98.5mm（平均：66.37[SD：13.71]mm）。年龄,身高和性别影响上呼吸道长度。
目的：本研究旨在确定声门下和胸外气管的长度及其影响因素。
方法：这是一项观察性回顾性研究。包括102名在上气道安静吸气阶段接受CT扫描的成年患者。
结果：结果显示，身高与前声门下和后声门下测量之间存在显着的正线性关系（p<0.001）。此外,具有统计学意义的，观察到年龄与胸外气管测量值之间存在中度强负相关(p>0.001).男性表现出较长的声门下前（p<0.001）和后（p>0.001）测量。在两性中，前声门下的平均长度为14.16（标准偏差[SD]：2.72）mm，后声门下为14.51（SD：2.85）mm，胸外气管为66.37（SD：13.71）mm。
结论：我们得出的结论是，正常健康成年人的前声门下长度为6.3-19.3毫米（平均值：14.16[SD：2.72]毫米），后声门下长度为6.1-20.0mm（平均：14.51[SD：2.85]mm），胸外气管长度为25.2-98.5mm（平均：66.37[SD：13.71]mm）。年龄,身高和性别影响上呼吸道长度。
