Vocal efficiency measurements in subjects with vocal polyps and nodules: A preliminary report
Vocal efficiency measurements in subjects with vocal polyps and nodules: A preliminary report
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DOI：
10.1177/000348940411300404
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发表时间：
2004-04-01
影响因子：
1.4
通讯作者：
Solomon, NP
中科院分区：
文献类型：
--
作者：
Jiang, J;Stern, J;Solomon, NP
发声效率是喉将声门下功率转换为声功率的能力的定量测量。在缺乏以往文献和临床直觉的基础上，我们检验了发声效率作为喉功能状态指标的假设。在声带小结和息肉患者中异常减少。由于获得发声效率的措施最困难的方面是声门下压的测定，我们应用了无创气流中断技术，为此目的。受试者正常的声音（n = 22），声带息肉（n = 14），声带小结（n = 16）发出不同的强度到一个面具通过管道连接到一个流量计，一个压力传感器，和声学麦克风。位于管道内的气球式阀门的充气提供了发声的中断。在气流中断期间发生的口内压力平台被用来估计声门下压。声门下功率和声功率被测定，它们的商提供了发声效率的量度。正常人的发声效率在70 dB时平均为1.15 × 10（-5），在75 dB时平均为3.17 × 10（-5）。7.52 x 10（-5），85 dB时为1.41 x 10（-4）。声带息肉患者在70 dB时的发声效率平均为3.62 × 10 ~（-6）。8.34 x 10（-6），75 dB。2.10 x 10（-5），85 dB时为4.26 x 10（-5）。声带小结患者的发声效率在70 dB时平均为4.32 x 10（-6），在75 dB时为1.57 x 10（-5），在80 dB时为4.26 x 10（-5），在85 dB时为8.34 x 10（-5）。与正常人相比，喉息肉或声带小结患者的发声效率明显降低。这些结果提供了定量验证的临床印象，发声效率低的患者与群众病变的声带。
Vocal efficiency is a quantitative measure of the ability of the larynx to convert subglottal power to acoustic power. On the basis of the scant previous literature and clinical intuition, we tested the hypothesis that vocal efficiency, as an indicator of the functional status of the larynx. is abnormally reduced in persons with vocal nodules and polyps. Because the most difficult aspect of obtaining measures of vocal efficiency has been the determination of subglottal pressure, we applied a noninvasive airflow interruption technique for this purpose. Subjects with normal voices (n = 22), vocal polyps (n = 14), and vocal nodules (n = 16) phonated at different intensities into a mask connected by way of piping to a flow meter, a pressure transducer, and an acoustic microphone. Inflation of a balloon-type valve located within the piping provided interruption of phonation. The intraoral pressure plateau occurring during flow interruption was used to estimate subglottal pressure. Subglottal power and acoustic power were determined, and their quotient provided a measure of vocal efficiency. The vocal efficiency in the normal subjects averaged 1.15 x 10(-5) at 70 dB, 3.17 x 10(-5) at 75 dB. 7.52 x 10(-5) at 80 dB, and 1.41 x 10(-4) at 85 dB. The vocal efficiency in the patients with vocal polyps averaged 3.62 x 10(-6) at 70 dB. 8.34 x 10(-6) at 75 dB. 2.10 x 10(-5) at 80 dB, and 4.26 x 10(-5) at 85 dB. The vocal efficiency in the patients with vocal nodules averaged 4.32 x 10(-6) at 70 dB, 1.57 x 10(-5) at 75 dB, 4.26 x 10(-5) at 80 dB, and 8.34 x 10(-5) at 85 dB. As compared to the normal subjects, the patients with laryngeal polyps or vocal nodules had significantly reduced vocal efficiency. These results provide quantitative verification of the clinical impression of inefficient phonation in patients with mass lesions of the vocal folds.