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This paper presents a user-friendly interface in Matlab??, called BioSigBrowser, that aims to facilitate the use of algorithms in biomedical signal processing. It includes methods related with cardiovascular signal processing, namely some multimodal analysis. This platform can treat a single signal or work in a batch mode on a given database as is usual in research. Furthermore, its modular characteristic...
In this paper, a novel multilead (ML) based automatic strategy for delineation of ECG boundaries is proposed and evaluated with respect to the QRS and T-wave boundaries. The ML strategy is designed from a single-lead (SL) wavelet-transform-based delineation system. It departs from three orthogonal leads and takes advantage of the spatial information provided using a derived lead better fitted for...
In this work we studied the evolution of increased ventricular repolarization dispersion (VRD) in the ECG during ischemia induced by percutaneous transluminal coronary angioplasty (PTCA). T-wave duration is measured by an automatic delineator and proposed as a index to quantify increased VRD. Moreover, spatial complexity of repolarization is measured by singular value decomposition (SVD) related indexes...
T-wave alternans (TWA) is considered as an index of susceptibility of sudden cardiac death. The Physionet/CinC challenge 2008 encourages teams to automatically detect and quantify the magnitude of TWA in every record of a given database. A reference ordering based on all entries submitted to the challenge is used for evaluation of algorithms. We participated in the challenge using a multilead analysis...
The objective of this work is to develop a model for ECG classification based on multilead features. The MIT-BIH Arrhythmia database was used following AAMI recommendations and class labeling. We used for classification classical features as well as features extracted from different scales of the wavelet decomposition of both leads integrated in an RMS manner. Step-wise and a randomized method were...
Electrogram (EGM) delineation is an increasingly important task to be performed in implantable cardiac devices such as pacemakers and defibrillators. Reliable detection and of EGM components might help to minimize the risk of false detections. Efforts are therefore undertaken to examine whether existing ECG delineators can be adapted for the delineation of EGMs. One issue to be solved is the low sampling...
In this work a multilead (ML) algorithm for ECG delineation was validated against the CSE and the PTB databases (DB). This algorithm is based on a previously validated single-lead (SL) algorithm, which is also used as reference in this work. For both DB a set of manual reference annotations made by experts is available. The algorithm performance was assessed by the measurement of QRS onset (QRSon)...
The precision of QT interval measures depends on the correct location of QRS and T boundaries and also on the analysing lead. The usual automatic strategy to deal with multiple leads is to apply post-processing decision rules for selecting one of the single-lead (SL) measures. We proposed a multilead VCG strategy that locates the onset and the end of the QT interval, attending to an optimal transformed...
In this work we studied the evolution of ventricular repolarization dispersion (VRD) in the ECG during ischemia induced by Percutaneous Transluminal Coronary Angioplasty (PTCA). We hypothesized that at early ischemia stages the endocardium action potential duration (APD) is slightly reduced or unchanged while the epicardium one is reduced in a larger proportion and afterwards the APD at the epicardium...
In this work we evaluate the joint robustness of a multilead delineation and a parametric approach to study the relations between HRV and QTV. The performance of the automatic system is studied over simulated 3-lead ECG signals in order to quantify the improvement allowed by the multilead delineation. Respiratory effect and contamination with realistic noise extracted from a real ECG, rescaled to...
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