Hoevers J, Loudon R G
University of Cincinnati Medical Center, Pulmonary/Critical Care Medicine.
Chest. 1990 Nov;98(5):1240-3. doi: 10.1378/chest.98.5.1240.
Crackles heard on auscultation can be represented graphically as a time-amplitude plot of the associated waveform. To assess the relative merits of several measures which might be considered for machine implementation in diagnostic instruments, we compared the reproducibility of those based on the initial voltage deflection which begins a crackle with those based on the largest deflection. The latter group showed less interobserver and less intraobserver variability when the same crackles were measured twice by each of two observers. Crackles from a teaching tape, categorized as fine and coarse, were used in this study. The ability of the various measures tested to distinguish between fine and coarse crackles on an individual basis was assessed and found to favor the measures based on the largest deflection. They showed an average of 9.96 percent incorrectly classified crackles, as opposed to 19.53 percent for the two measures based on the initial deflection.
听诊时听到的啰音可以用相关波形的时间-振幅图来表示。为了评估几种可能用于诊断仪器机器实现的测量方法的相对优点，我们比较了基于啰音起始初始电压偏转的测量方法和基于最大偏转的测量方法的可重复性。当两位观察者分别对相同的啰音进行两次测量时，后一组在观察者间和观察者内的变异性较小。本研究使用了教学磁带中的啰音，分为细啰音和粗啰音。评估了所测试的各种测量方法在个体基础上区分细啰音和粗啰音的能力，发现基于最大偏转的测量方法更具优势。它们平均有9.96%的啰音分类错误，而基于初始偏转的两种测量方法的错误分类率为19.53%。
