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首页> 外文期刊>The Laryngoscope: A Medical Journal for Clinical and Research Contributions in Otolaryngology, Head and Neck Medicine and Surgery, Facial Plastic and Reconstructive Surgery .. >Phonation threshold pressure measurements during phonation by airflow interruption.
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Phonation threshold pressure measurements during phonation by airflow interruption.

机译：由于气流中断而在发声期间的发声阈值压力测量。

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OBJECTIVE/HYPOTHESIS: Most methods to measure phonation threshold pressure (PTP) are clinically impractical because they are invasive. This report concerns an airflow interruption system developed to allow noninvasive estimation of (PTP) at different levels of vocal intensity. An estimation of PTP was made for normal subjects with normal larynges and no voice complaints and for individuals who had dysphonia associated with vocal polyps to compare the estimated minimal pressure across the glottis that was required to sustain phonation in the two conditions. STUDY DESIGN: This was a methodological study designed to measure an unanticipated PTP from a subject. METHODS: Subjects sustained a constant tone and the airflow was directed into a section of pipe with an airtight mask over the mouth and nose. The airflow, intramask pressure, and intensity of the acoustic output were recorded. A PTP was predicted from a difference between an estimate of the subglottal pressure and the vocal tract pressure at the point that phonation ceased after interruption of airflow. Eleven control subjects and 13 patients with vocal fold polyps were studied. In each population there were eight men and five women. The individuals in the group with vocal fold polyps averaged 39 years of age, and the control subject group averaged 49 years of age. Normal subjects produced a steady vowel /a/ at 75, 80, and 85 dB. Patients with polyps were unable to sustain phonation at these levels but were able to produce phonation at 65, 70, and 75 dB. The validity of the system was tested using a laryngeal model and in a patient with a normal larynx and voice who had a tracheotomy (placed for sleep apnea syndrome) which allowed direct measurement of subglottal pressure. RESULTS: The measured mean PTP levels (with standard deviation [SD]) for the control subjects were 2.38 (1.273), 2.67 (1.879), and 2.98 (2.23) cm H2O at 75, 80, and 85 dB, respectively. The measured mean PTP levels (with SD) for the patients with polyps were 4.79 (2.67), 5.85 (2.34), and 7.37 (3.26) cm H2O at 75, 80, and 85 dB, respectively. The differences in mean PTP between groups at 75, 80, and 85 dB were significant at P = .013, P = .017, and P = .010, respectively. CONCLUSIONS: The estimations of PTP for patients with vocal fold polyps were significantly higher than for the control subjects at three phonation levels.
机译：目的/假设：大多数测量发声阈值压力（PTP）的方法在临床上不切实际，因为它们具有侵入性。该报告涉及一种气流中断系统，该系统被开发为允许在不同声强水平下对（PTP）进行无创估计。对正常人的喉咙正常且无声音不适的人以及患有声乐障碍并伴有声息肉的人进行PTP估算，以比较估计的在两种情况下维持发声所需的声门上的最小压力。研究设计：这是一种方法研究，旨在测量受试者的意外PTP。方法：受试者保持恒定的语气，将气流引导至带有口罩的口管上，并在口鼻上覆盖。记录气流，面罩内压力和声音输出强度。通过在气流中断后发声停止点的声门下压力和声带压力之间的估计差异来预测PTP。研究了11名对照受试者和13名声带息肉患者。每个人口中有八男五女。声带息肉组的个体平均年龄为39岁，对照组为49岁。正常对象在75、80和85 dB处产生稳定的元音/ a /。息肉患者无法维持这些水平的发声，但能够产生65、70和75 dB的发声。该系统的有效性使用喉咙模型进行了测试，并且在喉管和声音正常的患者中进行了气管切开术（放置为睡眠呼吸暂停综合症），可以直接测量声门下压力。结果：在75、80和85 dB时，对照受试者的平均PTP水平（标准偏差[SD]）分别为2.38（1.273），2.67（1.879）和2.98（2.23）cm H2O。息肉患者在75、80和85 dB处测得的平均PTP水平（SD）分别为4.79（2.67），5.85（2.34）和7.37（3.26）cm H2O。在75、80和85 dB时，两组之间的平均PTP差异分别在P = .013，P = .017和P = .010时显着。结论：在三个发声水平上，声带息肉患者的PTP估计值显着高于对照组。

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