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目的研究应用于患者的低阻力型 Groningen 发音假体的空气动力学特性及机制。方法应用荷兰 Groningen 大学研制的空气动力学测量仪,采用重复测量,对24例喉全切除后安装低阻力型 Groningen 发音假体的患者进行同步测量发音时的声压级(sound pressure level)、气管内压力(pressure)及假声门上的气流率(flowrate)等三个参数,其中6例更换过发音假体,对他们使用的两个假体都进行了测量,分析各参数间的关系。结果 24例患者应用发音假体重复测量得出180组数据,经过数据筛选174组数据的声压级中位数为88.0 dB,气管内压力中位数为73.6 cm H_2O(1 cmH_20=0.098 kPa),假声门上气流率中位数为123.2 ml/s。30例次患者发音时的声压级与气管内压力无相关性(r=-0.058,P>0.05),与假声门上的气流率也无相关性(r=-0.119,P>0.05),气管内压力与假声门上的气流率呈正相关(r=0.699,P<0.05)。结论当假声门下气流使假声门产生振动后,再增加假声门下气流并不能使假声门振动幅度加大,因此,发音响度也不会增加。
Objective To study the aerodynamic characteristics and mechanisms of low-resistance Groningen phonation prostheses applied to patients. Methods Using the aerodynamic instrument developed by the University of Groningen in the Netherlands, repeated measurements were performed to measure the sound pressure level of 24 patients with low resistance Groningen phonation prostheses after total laryngectomy. The sound pressure level, Pressure, and flow rate on the false door. Six of them replaced the phonation prostheses, measured the two prostheses they used, and analyzed the relationship among the parameters. Results A total of 180 data sets were obtained from repeated measurements of phonetic prostheses in 24 patients. The median sound pressure level of the 174 data sets after screening was 88.0 dB, and the median endotracheal pressure was 73.6 cm H_2O (1 cmH_20 = 0.098 kPa) , Fake sound door on the median flow rate of 123.2 ml / s. There was no correlation between the sound pressure level at the time of sounding and the endotracheal pressure in 30 cases (r = -0.058, P> 0.05) and the airflow rate at the false door (r = -0.119, P> 0.05) , And the intra-tracheal pressure was positively correlated with the airflow rate on the false door (r = 0.699, P <0.05). Conclusion When the fake subglottic air flow makes the fake vocal door vibrate, the fake vocal-muffle air flow can not increase the vibration amplitude of the fake vow door. Therefore, the sound loudness will not increase.