When a "wheeze" is not a wheeze: acoustic analysis of breath sounds in infants
When a "wheeze" is not a wheeze: acoustic analysis of breath sounds in infants
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DOI：
10.1034/j.1399-3003.2000.16d04.x
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发表时间：
2000-10-01
影响因子：
24.3
通讯作者：
Everard, ML
中科院分区：
文献类型：
--
作者：
Elphick, HE;Ritson, S;Everard, ML
流行病学研究表明，儿童早期“喘息”的患病率很高。然而，很明显，父母和临床医生经常使用术语“喘息”来表示一系列可听到的呼吸噪音。婴儿期最常见的发自下呼吸道的声音是Ruttle，它与古典的喘息不同之处在于声音的音调要低得多，即连续的嘎嘎作响的音质，缺乏任何音乐特征。本研究的目的是利用声学分析技术，对15名婴儿的肺音进行客观的区分，其中7名婴幼儿为喘息型，8名为Ruttle型，使用小型灵敏的压电式加速度计记录肺音，并用感应体积描记法获取呼吸周期的相关信息。利用快速傅立叶变换技术(呼吸声学实验室环境计划)对声音信号进行分析。两种噪声的声学特性非常不同，经典喘鸣的特征是在功率谱显示中具有一个或多个明显峰值的正弦波形；Ruttle由不规则的非正弦波形表示，其功率谱中弥漫着峰值，并且在频率为
Epidemiological studies indicate that the prevalence of "wheeze" is very high in early childhood. However, it is clear that parents and clinicians frequently use the term "wheeze" for a range of audible respiratory noises. The commonest audible sounds originating from the lower airways in infancy are ruttles, which differ from classical wheeze in that the sound is much lower in pitch,,vith a continuous rattling quality and lacking any musical features. The aim of this study was to clearly differentiate wheeze and ruttles objectively using acoustic analysis.Lung sounds were recorded in 15 infants, seven with wheeze and eight with ruttles, using a small sensitive piezoelectric accelerometer, and information relating to the respiratory cycle was obtained using inductive plethysmography. The acoustic signals were analysed using a fast fourier transformation technique (Respiratory Acoustics Laboratory Environment programme).The acoustic properties of the two noises were shown to be quite distinct, the classical wheeze being characterized by a sinusoidal waveform with one or more distinct peaks in the power spectrum display; the ruttle is represented by an irregular nonsinusoidal waveform,vith diffuse peaks in the power spectrum and with increased sound intensity at a frequency of