Xinpei Wang

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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 depolarization phase (QRS complex) and(More)
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)
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 the(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)
In this paper, we report a membrane filter-based detection system of bacteria using streptavidin functionalized quantum dots (SA-QDs) as a fluorescent probe. The aimed E. coli cells were marked by quantum dots through immuno-recognition, and then the marked bacteria were enriched by a low-fluorescence optical aluminium oxide membrane. A portable system was(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)
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)
Heart rate variability (HRV) has been widely used in clinical research to provide an insight into the autonomic control of the cardiovascular system. Measurement of HRV is generally performed under a relaxed resting state. The effects of other conditions on HRV measurement, such as running, mountaineering, head-up tilt, etc, have also been investigated.(More)