Piirilä P
Institute of Occupational Health, Helsinki University Central Hospital, Finland.
Chest. 1992 Jul;102(1):176-83. doi: 10.1378/chest.102.1.176.
Recorded crackling lung sounds of 11 patients with pneumonia were studied with phonopneumography, FFT spectrography and time-expanded waveform display. The sounds were recorded on average six days after the onset of pneumonia and the recording was repeated two to four days later. In the first recording the crackles were coarse and midinspiratory. The patients with unilateral pneumonia had a significant difference in the upper frequency limit of inspiratory sound of the FFT spectrum between the healthy and diseased lung (p less than 0.01). In the second recording, the beginning of crackling had shifted later (p less than 0.01) and the end point of crackling also became later (p less than 0.05). The largest deflection width of the individual crackles became shorter (p less than 0.05). The results indicate that the pneumonic crackles vary markedly during the clinical course of pneumonia. The duration of the individual crackles became shorter and the timing of the crackles shifted toward the end of inspiration.
运用呼吸音描记法、快速傅里叶变换频谱分析法和时间扩展波形显示法，对11例肺炎患者的肺部啰音进行了研究。这些声音平均在肺炎发病后6天记录，然后在2至4天后重复记录。在首次记录中，啰音粗糙且出现在吸气中期。单侧肺炎患者患侧与健侧肺的FFT频谱吸气音高频上限有显著差异（p<0.01）。在第二次记录中，啰音起始时间延迟（p<0.01），啰音结束时间也延迟（p<0.05）。单个啰音的最大偏转宽度变窄（p<0.05）。结果表明，肺炎啰音在肺炎临床过程中变化显著。单个啰音的持续时间缩短，啰音出现时间向吸气末期偏移。
