Slavit D H, Lipton R J, McCaffrey T V
Department of Otorhinolaryngology, Mayo Clinic, Rochester, MN 55905.
Otolaryngol Head Neck Surg. 1990 Dec;103(6):947-56. doi: 10.1177/019459989010300611.
The development of valid objective measurements of vocal cord vibration during phonation is a goal of current research in laryngeal physiology. An excised canine larynx was used to study the effects of vocal cord tension, air flow rate, and glottic width on glottographic parameters. The electroglottographic and photoglottographic wave-forms were simultaneously recorded as the vocal cord tension, glottic width, and air flow rate were systematically varied. These glottographic waveforms were analyzed to determine the open quotient and speed quotient. Multiple regression analysis of the data obtained from 10 larynges showed the open quotient to be directly related to vocal fold tension (p less than 0.001), glottic width (p less than 0.01), and fundamental frequency (p less than 0.001). Speed quotient was inversely related to glottic width and and subglottic pressure (p less than 0.05). Regression analysis also showed frequency of vibration to be directly related to tension (p less than 0.001) and inversely related to glottic width (p less than 0.001), with different combinations of glottic tension and width capable of producing the same frequency. The open and speed quotients thus reflect the changes in the vibratory patterns of the vocal folds produced by alterations in tension and width. The clinical implications of these results will be discussed, with emphasis on glottography as an objective assessment of the various laryngeal framework procedures being performed.
开发有效的客观测量发声时声带振动的方法是当前喉生理学研究的目标。使用切除的犬喉来研究声带张力、气流速率和声门宽度对声门图参数的影响。在系统改变声带张力、声门宽度和气流速率的同时，同步记录电声门图和光声门图波形。对这些声门图波形进行分析以确定开放商和速度商。对从10个喉部获得的数据进行的多元回归分析表明，开放商与声带张力（p<0.001）、声门宽度（p<0.01）和基频（p<0.001）直接相关。速度商与声门宽度和声门下压力呈负相关（p<0.05）。回归分析还表明，振动频率与张力直接相关（p<0.001），与声门宽度呈负相关（p<0.001），不同的声门张力和宽度组合能够产生相同的频率。因此，开放商和速度商反映了由于张力和宽度的改变而导致的声带振动模式的变化。将讨论这些结果的临床意义，重点是声门图作为对正在进行的各种喉部框架手术的客观评估。
