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Wheeze duration in cough sounds for disease characterization.

Friend-KA; Goldsmith-WT; McKinney-WG; Reynolds-JS; Watkins-SA; Petsonk-EL; Abrons-HL; Frazer-DG
Proceedings of the 24th International Conference on Lung Sounds, Marburg, Germany, October 6-8, 1999. Lexington, KY: International Lung Sounds Association, 1999 Oct; :38-39
Pulmonary physicians use auscultatory techniques to assist in the diagnosis and management of lung disorders. Wheezing is one characteristic that is heard in many types of lung disease. For example, wheezing may be a clinical sign of chronic obstructive pulmonary disease or an asthma episode. To optimize the utility of lung sound assessment, characterization of the wheeze by location, intensity, pitch, and duration in the respiratory cycle is essential. In this study, the duration of wheeze in different disease groups was examined. A system was developed to record and analyze cough sounds. The system included a microphone positioned with its diaphragm tangent to the inner surface of a metal tube. A flexible 13-ft hose with 1-inch inner diameter was connected to the metal tube just past the microphone at the opposing end of the mouthpiece. Cough sound pressure waves generated were digitized at 12.8KHz and recorded using a sound analyzer. The signal was transferred to the computer for analysis. The coughs were obtained from patients awaiting testing at the West Virginia University Hospital pulmonary function laboratory. Patients were diagnosed using a fuzzy logic technique that incorporated actual and predicted spirometry values of FEVl and FVC within the fuzzy logic rule sets. Diagnosis led to the categorization of the patient in a particular disease group. Spectrograms were calculated from the patient's cough sound pressure waves. For each spectrogram, the number of wheezes and the duration of those wheezes were recorded.
Pulmonary-system-disorders; Pulmonary-disorders; Respiratory-system-disorders; Lung-disorders; Lung; Breathing; Audiological-testing; Analytical-processes; Analytical-methods; Analytical-instruments; Statistical-analysis
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Proceedings of the 24th International Conference on Lung Sounds, Marburg, Germany, October 6-8, 1999