Source: Annual Congress 2002 - Airway obstruction measurement (FOT - NEP) sleep and lung sound analysis
Disease area: Airway diseases

Abstract

Bronchial obstructions are characteristic for asthma and COPD. An objective, non-invasive method to detect these obstructions in long term is needed for an early and effective treatment. Electronic auscultation and analysis of lung sounds has a great potential for a monitoring of bronchial obstructions (Soviajärvi, A et al. Eur Respir Rev 2000, 10:77).
We recorded lung sounds from patients with COPD or Asthma at five different positions with our lung sound analyzer (Gross, V. et al. Am. J. Respir. Crit Care Med. 2000; 162: 905-909). The median frequencies (F50) for the frequency band between 60-2100Hz were calculated for in- and expiration and compared with the results of auscultation and lung function test (FEV1, MEF50, TLC, R, ITGV).
We investigated 12 patients with Asthma, 18 patients with COPD and 230 volunteers. Wheezing was detected in 14 patients. As expected, we found a significant increase of F50 in patients with wheezing compared to normal (p<0.01). Patients who had a decreased FEV1 (<80%) and did not wheeze show also an increase of F50.
We conclude, that the median frequency of lung sounds is a suitable parameter for a basic, continuous monitoring of bronchial obstruction.

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Citations should be made in the following way:
V. Gross, J. Benz, T. Penzel, U. Koehler, C. Vogelmeier (Marburg, Germany). Continuous monitoring of bronchial obstruction using lung sound analysis. Eur Respir J 2002; 20: Suppl. 38, 325

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