Source: Annual Congress 2002 - Monitoring respiratory parameters in critically ill patients
Disease area: Respiratory critical care

Abstract

In high-risk patients a continuous monitoring of a beginning pneumonia is very important for the initiation of early treatment. In the course of a pneumonia it is possible to detect adventitious sounds (crackles) as well as specific changes in transmitted lung sounds (bronchial breathing) based on the consolidation of the lung. We developed a new method, that allows to detect both crackles and changes in transmitted lung sounds.
Lung sounds of pneumonia patients were recorded with our digital lung sound analyzer in parallel to flow (Gross, V. et al. Am.J.Respir.Crit Care Med. 2000; 162: 905-909).
We analyzed the signal with a wavelet based crackle filter (Hadjileontiadis, L.J. IEEE Trans.Biomed.Eng 1997; 44: 1269-1281) in order to count and remove crackles. From the residual signal two parameters were derived, which reflect the consolidation of the lung: a) the ratio of the relative power of expiratory lung sounds between two frequency bands (I:60-240Hz; II:240-600Hz); b) the ratio between expiration and inspiration of the frequency band II.
28 patients with pneumonia and 230 volunteers were investigated. We found significant differences between patients and volunteers, which agree with usual signs of pneumonia (auscultation, x-ray findings, lab-results). Therefore, our parameters allow a simple, non invasive, long-term pneumonia-monitoring.

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Citations should be made in the following way:
V. Gross, L. Hadjileontiadis, K. Mack, T. Penzel, U. Koehler, C. Vogelmeier (Marburg, Germany; Thessaloniki, Greece). Lung sound based parameters for long-term pneumonia-monitoring. Eur Respir J 2002; 20: Suppl. 38, 626

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