Journal ArticleDOI
Automated Spectral Characterization of Wheezing in Asthmatic Children
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TLDR
Wheezing was found to be strongly dependent upon air flow, and generally followed the changes in pulmonary function as indicated by the forced expiratory volume at 1 s (FEV1).Abstract:
Breath sounds were recorded in normal and asthmatic children over the chest and trachea. The power spectra of the sounds were analyzed for peaks of high amplitude and high frequency as indications of wheezing. The percent of inspiration and expiration spent wheezing was used as an indication of the severity of bronchial obstruction. Wheezing was found to be strongly dependent upon air flow, and generally followed the changes in pulmonary function as indicated by the forced expiratory volume at 1 s (FEV1). The trachea was found to be a better location for analyzing wheezes than the lung.read more
Citations
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Journal ArticleDOI
Bronchial provocation tests in young children using tracheal auscultation
Journal ArticleDOI
Wheeze monitoring in children for assessment of nocturnal asthma and response to therapy.
TL;DR: Wheeze monitoring provides quantitative and noninvasive information about the extent of nocturnal wheeze wheezing in children, correlates well with conventional indices of asthma activity and can assist in assessing efficacy of treatment.
Journal ArticleDOI
Digital respirosonography: new images of lung sounds
TL;DR: Tape recordings from normal subjects and from patients with lung disease were used to generate spectrographic images of respiratory sounds on a personal computer that presented timing and frequency content of lung sounds, with the sound intensities displayed on a color scale.
Journal ArticleDOI
Acoustic properties of the normal chest
TL;DR: Clearly, further studies need to be performed in order to elucidate the true mechanisms involved in generating vesicular lung sounds, the redistribution of intrapulmonary gas or vibrations caused by the stretching of lung tissue.
Journal ArticleDOI
Chest surface mapping of lung sounds during methacholine challenge.
TL;DR: Lung sounds were sensitive to changes in airway caliber, but were not specific indicators of bronchial hyperresponsiveness.
References
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Journal ArticleDOI
Wave-speed limitation on expiratory flow-a unifying concept.
S. V. Dawson,E. A. Elliott +1 more
TL;DR: The theoretical approach to the "waterfall effect" leads to selection of the analogy of constricted open-channel flow to apply to the elastic network of airway tubes, and results are derived for the case of negligible friction by use of the Bernoulli principle.
Journal ArticleDOI
Spectral characteristics of normal breath sounds.
TL;DR: Breath sounds picked up over the trachea were characterized by power spectra typical to a broad spectrum sound with a sharp decrease of power at a cut-off frequency that varied between 850 and 1,600 Hz among the 10 healthy subjects studied.
Journal ArticleDOI
Visual Lung-Sound Characterization by Time-Expanded Wave-Form Analysis
TL;DR: Time-expanded wave form analysis provides reproducible visual displays that allow documentation of the differentiating features of lung sounds and enhances the diagnostic utility of the sounds.
Journal ArticleDOI
Relationship of Wheezing to the Severity of Obstruction in Asthma
Chang S. Shim,M. Henry Williams +1 more
TL;DR: Although characterization of wheezing has a general relationship to the severity of airway obstruction, an objective measurement of expiratory flow rate is necessary for the evaluation of each patient's condition.