Summary Objective: Pulmonary disorders are frequently characterized by the presence of adventitious sounds added to breathing or base lung sound (BLS). The aim this work was assess features BLS in extrinsic allergic alveolitis (EAA) patients comparison healthy subjects, applying linear and nonlinear analysis techniques. Methods: We investigated multichannel on posterior chest 16 females, 8 EAA patients, when at 1.5 L/s. were obtained from power spectral density (PSD) while extracted concepts...

Uterine electromyogram on the abdomen of pregnant women (electrohysterogram, EHG) plays an interesting role to evaluate possible risks binomial mother-fetus. In this sense, present study explored characterization contractions by EHG during active phase labor at term in a population low risk. The goal was investigate differences generated that evolve vaginal delivery (group 1) those associated with caesarean section 2). Abdominal signals were acquired using Ag-AgCl electrodes bipolar...

In this work, we present a mobile health system for the automated detection of crackle sounds comprised by an acoustical sensor, smartphone device, and application (app) implemented in Android. Although pulmonary auscultation with traditional stethoscopes had been used decades, it has limitations detecting discontinuous adventitious respiratory (crackles) that commonly occur diseases. The proposed app allows physician to record, store, reproduce, analyze directly on smartphone. Furthermore,...

In studies of autonomic regulation during orthostatic challenges only a few nonlinear methods have been considered without investigating the effect gender in young controls. Especially, temporal development has not yet explicitly analyzed using short-term segments supine position, transition and phase (OP). this study, analysis cardiovascular respiratory time series was performed to investigate how indices are dynamically changing with respect challenges. The carried out shifted throughout...

It is now widely accepted that crackles are associated with different pulmonary pathologies and efforts have been done to detect extract them. Consequently, due the difficulty for their characterization, selection of an adequate time-frequency representation (TFR) analysis dynamics important. Traditionally, normal abnormal lung sounds analyzed by Spectrogram (SP). However, this tool has certain disadvantages when one deals nonstationary signals. As effort point out appropriate crackles,...

The effect of an orthostatic stress on cardiovascular and respiratory complexity was investigated to detect impaired autonomic regulation in patients with vasovagal syncope (VVS). A total 16 female 12 age-matched healthy subjects were enrolled a passive 70° head-up tilt test. Also, male study gender differences. Analysis performed dynamically using various short-term (5 min) windows shifted by 1 min as well 20 phase (OP) evaluate local global complexity. Complexity determined over multiple...

Sound transmission has been of interest for many years in an attempt to study the structure lung and different researches have shown that artificial sounds produce a lateralization sound information at thoracic surface. Most these studies use non-simultaneous recording input introduced mouth or other points. In this paper, we present acoustic images, transmitted glottal sounds, formed by multichannel system with array 5times5 microphones. The was done using 4 healthy subjects having diffuse...

Adventitious lung sounds (ALS) as crackles and wheezes are present in different alterations their automated characterization recognition have become relevant. In fact, recently 2D spatial distribution (SD) imaging has been proposed to help diagnose of pulmonary diseases. this work, independent component analysis (ICA) by infomax was used find sources from them apply a time variant autoregressive model (TVAR) count the ALS. The methodology assessed on multichannel LS recordings embedding...

Blind source separation by independent component analysis has been applied extensively in the biomedical field for extracting different contributing sources a signal. Regarding lung sounds to isolate adventitious from normal breathing sound is relevant. In this work performance of FastICA, Infomax, JADE and TDSEP algorithms was assessed using scenarios including simulated fine coarse crackles embedded recorded sounds. Our results pointed out that Infomax obtained minimum Amari index...

Abstract Linear dynamic analysis of cardiovascular and respiratory time series was performed in healthy subjects with respect to gender by shifted short-term segments throughout a head-up tilt (HUT) test. Beat-to-beat intervals (BBI), systolic (SYS) diastolic (DIA) blood pressure interval (RESP) were acquired 14 men 15 women. In domain (TD), the descending slope auto-correlation function (ACF) (BBI_a31cor) more pronounced women than (p<0.05) during HUT test considerably steeper...

Idiopathic pulmonary fibrosis (IPF) is a chronic and restrictive disease characterized by inflammatory changes in lung tissue producing reduction diffusion capacity leading to exertional arterial hypoxemia dyspnea. Furthermore, clinically, supplemental oxygen (SupplO2) has been prescribed IPF patients improve symptoms. However, the evidence about benefits or disadvantages of supplementation not conclusive. In addition, impact SupplO2 on autonomic nervous system (ANS) regulation respiratory...

RATHI was introduced as an attempt to further improve the association between anatomical zones and specific breathing activity, both spatially temporally. This work compares with clinical pulmonary auscultation (PA) assess concordance procedures detect asymmetries in lung sound (LS) intensities. Twelve healthy young males participated study were auscultated by two experts. consisted acquisition of acoustical signals array 5x5 sensors, while experts described intensity LS heard using same...

Several techniques have been explored to detect automatically fine and coarse crackles; however, the solution for automatic detection of crackles remains insufficient. The purpose this work was explore capacity time-variant autoregressive (TVAR) model provide an estimate number in lung sounds. Thus, simulated inserted normal sounds real containing adventitious were processed with TVAR by expert that based crackle on time-expanded waveform-analysis. coefficients obtained adaptive filtering...

In this study, the linear method of extended partial directed coherence (ePDC) was applied to establish temporal dynamic behavior cardiovascular and cardiorespiratory interactions during orthostatic stress at a 70° head-up tilt (HUT) test on young age-matched healthy subjects patients with intolerance (OI), both male female. Twenty 5-min windows were used analyze minute-wise progression from 5 min in supine position (baseline, BL) until 18 phase (OP) without including pre-syncopal phases....

To assess the feasibility to generate a confident image of normal breath sounds (BS) based on quantitative analysis multichannel sensors and imaging them in three known clinical classes, i.e., tracheal, bronchial vesicular, identifying their spatial distribution with high resolution posterior thoracic surface.Three parametrization techniques, percentile frequencies, univariate AR modeling, eigenvalues covariance matrix were evaluated when applied BS. These acquired twelve healthy subjects by...

Several researches have tried to provide a means analyze the second heart sound (S2) in an attempt understand functional mechanisms its genesis and for diagnosis purposes. In this work we tested Time-Frequency Representation (TFR) simulated S2 selecting applying classical modern TFRs such as Spectrogram, Wigner-Ville Distribution, Time Varying Autoregressive (TVAR) model, Scalogram, Hilbert-Huang Spectrum (HHS) by Empirical Mode Decomposition. Two performance measures are proposed, first one...