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Approximate entropy (ApEn) is widely accepted as a complexity measure of the heart rate variability (HRV) signal, but selecting the criteria for the threshold value r is controversial. This paper aims to verify whether Chon's method of forecasting the r(max) is an appropriate one for the HRV signal. The standard limb lead ECG signals of 120 subjects were(More)
Premature ventricular contraction (PVC) may lead to life-threatening cardiac conditions. Real-time automated PVC recognition approaches provide clinicians the useful tools for timely diagnosis if dangerous conditions surface in their patients. Based on the morphological differences of the PVC beats in the ventricular depolar-ization phase (QRS complex) and(More)
Pattern synchronization (PS) can capture one aspect of the dynamic interactions between bivariate physiological systems. It can be tested by several entropy-based measures, e.g., cross sample entropy (X-SampEn), cross fuzzy entropy (X-FuzzyEn), multivariate multiscale entropy (MMSE), etc. A comprehensive comparison on their distinguishability is currently(More)
—Detection of the primary sound components in heart sound signal is the first step in automated diagnosis of cardiac abnormality. Although most existing heart sound detection algorithms perform well in normal signals, they usually have no effect on signals with heart murmurs. In this paper, an algorithm based on energy is proposed for robust detection of(More)
BACKGROUND Heart rate variability (HRV) has been widely used in the non-invasive evaluation of cardiovascular function. Recent studies have also attached great importance to the cardiac diastolic period variability (DPV) examination. Short-term variability measurement (e.g., 5 min) has drawn increasing attention in clinical practice, since it is able to(More)
Coronary artery disease (CAD) is the most common cause of death globally. To detect CAD noninvasively at an early stage before clinical symptoms occur is still nowadays challenging. Analysis of the variation of heartbeat interval (RRI) opens a new avenue for evaluating the functional change of cardiovascular system which is accepted to occur at the(More)
The purpose of this study is to investigate the effects of carpal tunnel syndrome on hand intrinsic muscle activities using surface electromyogram (sEMG) during precision grip. Six CTS patients and six age- and gender-matched healthy volunteers participated in the experiment. The subjects were instructed to stably grip an instrumented apparatus with their(More)
This study investigated effects of carpal tunnel syndrome (CTS) on digit flexibility and range of motion. Twelve healthy, right-handed subjects attended the experiment (6 patients with CTS and 6 healthy controls). The digit flexibility was tested through a Purdue Pegboard Test and the digit's range of motion was tested in process of thumb opposition and(More)
Changes in amplitude characteristics of the first heart sound (S1) and second heart sound (S2) have been confirmed to be linked with the physiological or pathological changes of cardiovascular system. Earlier studies have also documented that these changes in amplitudes of S1 and S2 were correlated with blood pressure (BP) factor.(More)
This study aimed to improve the accuracy for normal/abnormal classification of heart sound recordings from PhysioNet/Computing in Cardiology Challenge 2016. In order to get the main elements of the first heart sound (S1) and the second heart sound (S2) for segmentation, the Butterworth filter with a pass-band of 25–400 Hz was replaced by the wavelet(More)