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Spectral analysis is widely applied to bioelectric cardiac signals for quantifying the spatiotemporal organization of cardiac tissue. Nevertheless, to date it is not well understood how lead characteristics affect the spectrum of recorded cardiac signals and, as a consequence, the interpretation of cardiac spectrum is still controversial. In this paper we use simulation methods to investigate the...
It has been previously argued that science and engineering undergraduate students can benefit greatly from learning the history of their discipline. In order to successfully enhance learning by introducing history into undergraduate curriculum, it would be desirable to assess what the current educational uses of history are and to understand the needs and perceptions of teachers. Nevertheless, to...
In this communication, an innovative dual band microstrip patch antenna is proposed for Implantable Medical Devices (IMD). Particularly, the covered bands are MICS (402–405MHz) and ISM (2.4–2.48GHz). The antenna has a multilayer configuration where the feeding line and radiating layer are located at different levels. The radiating element of the antenna is a Split Ring Resonator (SRR) coupled to a...
Engineering students face their professional future with uncertainty partly because of a poor understanding of the industry and careers opportunities. This problem can be tackled by designing an engineering curriculum that includes courses embodying both technical and professional contents. In this paper we report the preliminary results of the implantation of a lifelong, collaborative student-centered...
The history of the IEEE EMBS runs hand in hand with the history of Biomedical Engineering both as a scientific discipline and as a profession. The conferences and publications led by IEEE EMBS, amongst other activities were a mirror of the evolution of Biomedical Engineering over the years and they equally contributed to shape Biomedical Engineering as we view it today. The IEEE EMBS provides a testimony...
It has been previously documented that the main features and sensing performance of electrograms (EGMs) recorded in implantable cardioverter defibrillators (ICDs) depend on lead configuration. Although this dependence has been ascribed to differences in lead sensitivity and spatial resolution, the quantification of these two properties on ICD has not yet been attempted. In this paper, an operative...
Implantable Cardioverter Defibrillator (ICD) are devices which give relevant information about tachyarrhythmias in patients. The classical spectral approaches to assess cardiac electrograms (EGM) from ICD, Dominant Frequency Analysis (DFA) and Organization Analysis (OA) have often discarded relevant information in the spectrum, such as the harmonic structure. We propose a description, called Fourier...
The present study applies modeling methods to study the simulated ECG of a subQ monitor with bipolar lead. The objective of the study was to analyze how different locations of ectopic activation affect the ECG obtained with horizontal and vertical electrode orientation. The ectopic activation was set to originate from 6 different locations and conduct through both ventricles. We had implants in 63...
Vasovagal Syncope (VVS) represents the most frequent cause of loss of consciousness. Additionally to its clinical usefulness, the tilt test is a good quality physiological gold standard for the spectral analysis of Heart Rate Variability (HRV). Noise removal in HRV signals is problematic, due to the presence of ectopic beats and non-stationary short-term trends. Given current Tilt Test systems simultaneously...
Modeling offers effective means of studying the effects of implant dimensions on the measured electrocardiograph (ECG) prior to any in vivo tests, and thus provides the designer with valuable information. Finite difference (FDM) and lead field approaches combined with cardiac activation models offer straightforward and effective methods for analyzing different ECG measurement configurations. In the...
Lead design is a critical factor for detecting and redetecting lethal arrhythmias in electrograms (EGM) from Implantable Cardioverter Defibrillators (ICD). The estimation of the scope of a lead can help to elucidate the anatomical origin of recorded EGM and explain signal features. In this paper, we compare quantitatively the scope of true and integrated bipolar sensing leads by combining bioelectric...
The long QT syndrome type-3 (LQT3) is an inherited cardiac disorder caused by mutations in the sodium channel gene SCN5A. LQT3 has been associated with ventricular arrhythmias and sudden cardiac death, specially at low heart rates. Based on computer simulations and experimental investigations, analysis of the morphology of the action potential (AP) has shown that it undergoes early after depolarizations...
The present paper describes a study where effects of anterior myocardium on body surface potentials were investigated. The study combines numerical lead field analysis combined with cardiac automata model. Electric fields are calculated with finite difference method in a 3-D model of male thorax. The cardiac activation applied in the study is an ectopic beat originating in the apex. The correlations...
A wide number of cardiac indices have been proposed to describe electrocardiograms (ECG) during Ventricular Fibrillation (VF), and they can be useful when analyzing electrograms (EGM) stored in implantable cardioverter Defibrillator (ICD) during spontaneous VF. However, the dependence of their measurement on acquisition and preprocessing conditions has not been so far statistically quantified. We...
Intra-cardiac pressure gradients (ICPG) are usually estimated by post-processing of flow color Doppler M-mode images (CDMMI) by using a sequence of processing steps. We propose a novel image processing method which gives a single-step approximation of the ICPG image, based on a simple, yet specifically developed, support vector machine (SVM) algorithm. Our method only requires the SVM estimation of...
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