VISUAL LUNG-SOUND CHARACTERIZATION BY TIME-EXPANDED WAVE-FORM ANALYSIS
VISUAL LUNG-SOUND CHARACTERIZATION BY TIME-EXPANDED WAVE-FORM ANALYSIS
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DOI：
10.1056/nejm197704282961704
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发表时间：
1977-01-01
影响因子：
158.5
通讯作者：
KNOWLER, WC
中科院分区：
文献类型：
--
作者：
MURPHY, RLH;HOLFORD, SK;KNOWLER, WC
为了客观地表征肺音，通过时间振幅图检查了 6 名观察者认为是标准分类中典型的听诊现象的选定磁带录音。在 100 毫米/秒或更低的传统图表记录仪速度下，无法一致地在视觉上区分正常肺音与外来声音，但当绘图的时间尺度提高到 800 毫米/秒时，很容易实现区分。当临床上听到不连续的声音（啰音、爆裂声或捻发音）时，时间扩展波形表现为间歇性不连续偏转，通常持续时间小于10毫秒。当听到连续的声音（啰音或喘息声）时，偏转通常超过 250 毫秒。时间扩展波形分析提供可重复的显示，允许记录肺音的区分特征并增强声音的诊断实用性。
To characterize lung sounds objectively, selected tape recordings of auscultatory phenomena considered by 6 observers to be typical of those in a standard calssification were examined, by means of time-amplitude plots. Normal lung sounds could not consistently be visually distinguished from adventitious sounds at conventional chart recorder speeds of 100 mm/s or less, but the differentiation was easily achieved when the time scale of the plots was raised to 800 mm/s. When discontinuous sounds (rales, crackles or crepitations) were heard clinically, the time-expanded wave forms showed intermittent discontinous deflections usually less than 10 ms in duration. When continuous sounds (rhonchi or wheezes) were heard, the deflections were usually more than 250 ms. Time-expanded waveform analysis provides reproducible displays that allow documentation of the differentiating features of lung sounds and enhances the diagnostic utility of the sounds.