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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Analysis of Respiratory Sounds in Asthmatic Infants
TL;DR: Electronic auscultation and recording of breathing was performed in a group of 26 asthmatic infants in order to detect the presence of wheezing and determine appropriate respiratory spectra parameters for early detection of possibleAsthmatic seizures.
Journal ArticleDOI
Respirosonography in infants with acute bronchiolitis.
TL;DR: In this paper, lung sounds and breathing patterns in 16 infants with acute bronchiolitis who were treated with nebulized salbutamol (albuterol) were analyzed.
Journal ArticleDOI
A survey on automated wheeze detection systems for asthmatic patients.
TL;DR: An evidence of automated wheeze detection system by a survey that can be very beneficial for asthmatic patients is presented and important details including the hardware used, placement of hardware, and signal processing methods have been presented clearly to help and encourage future researchers to develop commercial system that will improve the diagnosing and monitoring of astHmatic patients.
Journal ArticleDOI
A Portable System for the Spectral Analysis of Cough Sounds in Asthma
TL;DR: A practical and portable method is described to analyze the sound spectra of coughs based upon a personal computer and will be used initially to examine the effects of exercise on the sound of cough in asthma.
Journal ArticleDOI
Identification of asthma severity levels through wheeze sound characterization and classification using integrated power features
TL;DR: The univariate results of this study indicated that the majority of features significantly discriminated for asthma severity levels, including the ensemble, k-nearest- neighbour, and support vector machine (SVM) classifiers.
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.