AIMS To investigate how variability in activation sequence and passive conduction properties translates into clinical variability in QRS biomarkers, and gain novel physiological knowledge on the information contained in the human QRS complex. METHODS AND RESULTS Multiscale bidomain simulations using a detailed heart-torso human anatomical model are performed to investigate the impact of activ...

QRS complex detection is usually the most important step for automated electrocardiogram (ECG) analysis. In this paper, we present a new approach of QRS complex detection. The Mexican-hat wavelet and complex Morlet wavelet are used to transform the ECG signal, and according to the trait that the modulus maxima of the two wavelet coefficients above correspond with R peaks of ECG signal, a detect...

An analog QRS complex detection circuit, for pacemaker applications, based on the Wavelet Transform (WT) is presented here. The system detects the modulus maxima of the QRS complex. It consists of a wavelet transform fi lter, an absolute value circuit, a peak detector and a comparator. In order to achieve the low -power requirement in pacemakers, we propose a new method for implementing the WT ...

An approach has been developed using artificial neural networks to detect QRS complexes within an ambulatory ECG signal. The method employs the use of an artificial neural network classifier to recognise the morphology of a QRS complex based on amplitude and derivative features. The feature vectors are derived from a representative annotated ECG trace and are used in the formulation of the ANN'...

THE TERM "peri-infarction block" was suggested by First, Bayley, and Bedford1 in 1950 to describe a type of intraventricular conduction defect that develops following myocardial infarction. They described alteration in the direction of the early portion of the QRS complex (initial QRS forces) that produced definite manifestations of myocardial infarction (i.e., Q waves) and slurring and prolong...

A 32-year old woman with severe mitral regurgitation. congestive heart failure, and Wolff-ParkinsonWhite syndrome developed frequent, nonsustained episodes of a wide QRS complex tachycardia several days postpartum. Figure 1 shows an ECG with telemetry lead I and modified chest lead (MCL) recorded while the patient complained ot" palpitations. The same pattern of initiation and termination of th...

In cases of tachycardia with a broad QRS complex, it is important to differentiate between supraventricular tachycardia (SVT) and ventricular tachycardia (VT). Electrocardiogram (ECG)-based differential diagnoses include VT vs. SVT with aberrant conduction, pre-existing bundle branch block (BBB), intraventricular conduction disturbances, and pre-excitation. Several criteria have been described ...

This paper analyses the application of wavelets for the efficient detection of QRS complex in ECG. Wavelets provide simultaneous time and frequency information. In this research, the effects of the properties of different wavelet functions, such as time/frequency localization and linearity, on the accuracy of QRS detection are examined. Initially, a wavelet transform filtering is applied to the...

BACKGROUND AND OBJECTIVES QRS complex fragmentations are frequently seen on routine electrocardiograms with narrow or wide QRS complex. Fragmented QRS complex (fQRS) is associated with increased morbidity and mortality, sudden cardiac death and recurrent cardiovascular events. In this study, we aimed to interrogate the relationship of systemic inflammation with the presence of fQRS in patients ...

INTRODUCTION The aim of this study was to evaluate the changes in ventricular complex voltage associated with narrow QRS supraventricular tachycardia (SVT). METHODS AND RESULTS One hundred forty-five patients undergoing catheter ablation for SVT, 85 with AV nodal reentrant tachycardia (AVNRT) and 60 with AV reentrant tachycardia (AVRT) due to a concealed accessory pathway, were studied. Four ...