Approach to the Dynamics of the Vocal Cords During the Exploration With Flexible Laryngeal Stroboscopy

IF 1.7 4区医学 Q2 OTORHINOLARYNGOLOGY

Laryngoscope Investigative Otolaryngology Pub Date : 2025-09-09 DOI:10.1002/lio2.70219

Walter Tenesaca, Roberto Fernández-Baillo, Isabel Cardoso, Vicente Pino, Emerson Chachi

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Abstract

Objective

The mucosal wave (MW) is fundamental to assessing vocal fold function, with laryngeal stroboscopy (LS) serving as a pivotal tool in its evaluation. However, technical factors associated with LS may alter the basal oscillatory dynamics of the free edges (FEs), which may bias the interpretation of results. This study aimed to analyze the dynamics of FEs, particularly MW, from the correlates extracted using a voice signal analysis method during LS, comparing it with habitual phonation without LS. Additionally, it was determined if this method can complement LS.

Methods

This descriptive study analyzed voice recordings from a sample of 137 adult subjects categorized into three groups with different conditions in their vocal folds. Voice recordings were processed using the Voice OnlineLab VCS tool. All participants had their speech signal recorded at natural pitch and volume in two situations: phonation without LS and phonation during LS. We studied the parameters: F0, tension index, glottal gap size, and MW index, closed/open phases. Statistical analysis was conducted based on the distribution values and mean differences according to the phonation situation, group, and gender. Pearson's correlation coefficient was employed to establish relationships between parameters, and Student's t-test was used to identify differences and test hypotheses.

Results

During LS, mean F0 values increased significantly. In addition, variations were observed in the correlates that reflected the degree of tension, contact type, and the resulting MW. Furthermore, distinct compensatory patterns were identified between male and female participants.

Conclusions

The findings indicate important changes in patients' phonatory gestures during LS. These alterations may bias clinicians' assessments of FEs oscillatory dynamics. Therefore, practitioners using LS in clinical practice should consider these findings.

Level of Evidence

Level 2.

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软性喉频闪镜探查声带动态的探讨

目的粘膜波（MW）是评估声带功能的基础，喉频闪检查（LS）是评估粘膜波的关键工具。然而，与LS相关的技术因素可能会改变自由边缘（FEs）的基本振荡动力学，这可能会使结果的解释产生偏差。本研究旨在从语音信号分析方法提取的相关信息中，分析声频，尤其是声频的动态变化，并将其与无声频的习惯发声进行比较。此外，还确定了该方法是否可以补充LS。方法对137名成人的录音资料进行描述性分析，并将其分为三组。使用Voice OnlineLab VCS工具对录音进行处理。在两种情况下，所有参与者的语音信号都以自然的音高和音量被记录下来：一种是在没有LS的情况下发声，另一种是在LS的情况下发声。我们研究了参数：F0，张力指数，声门间隙大小，MW指数，闭合/打开相位。根据发音情况、分组和性别的分布值和平均差异进行统计分析。采用Pearson相关系数建立参数之间的关系，采用Student’st检验识别差异并检验假设。结果LS期间，平均F0值显著升高。此外，在反映张力程度、接触类型和由此产生的MW的相关性中观察到变化。此外，在男性和女性参与者之间发现了不同的补偿模式。结论LS患者语音手势发生了重要变化。这些改变可能会使临床医生对FEs振荡动力学的评估产生偏差。因此，在临床实践中使用LS的从业者应该考虑这些发现。证据等级2级。

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