Analysis of acoustic frequency and wave amplitude generated by the Oscillatory Thoracic Thixotropic Device (Diottix(r)) in human chest

Diottix(r) was calibrated at 25 Hz to achieve the frequency indicated in literature as being effective to mobilize the airways secretions. However, the amplitude and frequency of the waves generated by the equipment in different regions of the chest still need to be investigated. The objective of this study was to analyze the frequency and amplitude of waves generated by Diottix(r) in chests of healthy subjects. Diottix(r) was used in the anterior and posterior regions of the chest. The mechanical waves were captured using stethoscopes connected to electret microphones, which were connected to a digital oscilloscope. Frequency and amplitude data were recorded by the stethoscope, positioned in six points in the anterior region and six in the posterior region of the chest, following the positions commonly used in pulmonary auscultation. Signals were recorded and transferred to a computer with software for their analysis. The frequency of waves did not present a significant change (from 24.9 to 26.4 Hz). The wave amplitude in the anterior versus the posterior region in each area of the lung, the upper, middle and lower, had differences. Diottix(r) produces frequencies in the chest according to the calibrated; thus, it can be a complementary resource to bronchial hygiene maneuvers. The amplitudes of waves seem to be affected by other structures like bone parts and heart.

Diottix(r)已以25 Hz完成校准，以达到文献中记载的可有效松动气道分泌物的频率。然而，该设备在胸部不同区域产生的声波振幅与频率仍有待进一步研究。本研究旨在分析Diottix(r)在健康受试者胸部产生的声波频率与振幅。实验中将Diottix(r)作用于受试者胸部的前侧与后侧区域。通过连接驻极体麦克风的听诊器采集机械声波，该麦克风再与数字示波器相连。按照肺部听诊常用点位，在胸部前侧区域选取6个测点、后侧区域选取6个测点，通过听诊器记录声波的频率与振幅数据。采集到的信号将被记录并传输至搭载专用分析软件的计算机进行分析。声波频率未出现显著变化，范围为24.9 Hz至26.4 Hz。在肺的上、中、下各区域中，胸部前侧与后侧的声波振幅均存在差异。Diottix(r)在胸部产生的声波频率符合其校准参数，因此可作为支气管卫生操作的辅助手段。声波振幅似乎会受到骨骼、心脏等其他组织结构的影响。