Source: Annual Congress 2001 - Monitoring acute lung disease

Abstract

Introduction: During the course of a pneumonia there are characteristic changes of transmitted lung sounds. We designed a method based on wavelet-transformation, that enables to detect consolidations of the lung caused by developing and acute pneumonia and can be used as a non-invasive monitoring system for high risk patients.
Methods: Starting on the day of admission to our hospital, we daily recorded (min. 2 weeks) the lung sounds of patients with one-sided pneumonia with 4 air-coupled microphones (Sony ECM 77) simultaneously to the air-flow. The respiratory signals were analyzed by Wavelet transformation (WT, Matlab 5.3). The WT-coefficients of the frequency band 345-690 Hz were computed for each respiratory cycle. We calculated the ratio between the two phases for both sides of the lung and calculated the difference between the pneumonia and healthy side (ΔR). We measured the patients again after recovery.
Results: ΔR was significantly increased during the acute infection (ΔR_i1=0.9±]0.6; ΔR_v=0.0±]0.1 for 218 healthy volunteers, p<0.05) and, in the course of recovery, decreased to normal values (ΔR_i2=0.1±]0.1) parallel to x-ray findings and clinical signs.
Conclusion: Our method is a suitable instrument for the early detection and long-term documentation of a consolidation of the lung caused by pneumonia.

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Citations should be made in the following way:
K. Mack, V. Gross, T. Penzel, U. Koehler, J. H. Peter, C. Vogelmeier (Marburg, Germany). Long-term recording of lung sounds in patients with pneumonia and bronchial breathing. Eur Respir J 2001; 16: Suppl. 31, 1648

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