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In this paper, a new cascaded neural networks approach of classifying waveforms is proposed. Compared to the traditional single back propagation networks (BP networks), the cascaded neural networks can decrease computational complexity and improve the classification performance at the same time in the case of the sheer volume of sampling data. The improved classification method adopts two-layered...
The human cardiovascular system exhibits complicated dynamics. Various signal analysis techniques have been utilized to study electrocardiogram (ECG) rate and morphology for their potentials in diagnosis and prediction of cardiovascular diseases. Conventional methods of linear signal theory, including power spectral analysis and time-domain analysis, have been widely adopted to analyze heart rhythm...
In this paper, a new framework is presented to analyze the dynamical alternans pattern in ECG. As the beginning work, a brief screening algorithm is described to decrease the time consumption for the framework.The electrical alternans, especially the T wave alternans (TWA), is considered as the danger symptom to sudden cardiac death (SCD). The current methods identifying TWA are reviewed summarily...
In this paper, the objective was to investigate the heart rate variability in two selected groups of premature infants (sepsis vs non-sepsis). We studied the RR interval series not only by linear methods - time domain and frequency domain, but also by non-linear methods - chaos theory and information theory, in order to find the optimal parameters to distinguish sepsis premature infants from non-sepsis...
In ambulatory ECG records, ischemia is manifested by transient ST segment episodes which may or may not be accompanied by increase in heart rate. There are also transient heart-rate related non-ischemic ST segment episodes present which are caused by change in heart rate. The goal of this work was to classify between these two types of ST episodes. The selected features to classify the ST episodes...
To evaluate the relationship between lesion's severity and nonlinear indexes of HRV, 20 first-ever stroke subjects and 10 healthy subjects were studied. All patients, divided in two groups according to presence of single or multiple medium cerebral artery lesion, underwent to a 24-hour Hotter ECG recording. All RR time series were analyzed by Poincare Plot, fractal dimension, power-law behaviour,...
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