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Engineering in Medicine and Biology Magazine, IEEE

Issue 6 • Date Nov.-Dec. 2006

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Displaying Results 1 - 25 of 28
  • IEEE Engineering in Medicine and Biology Magazine - Nov.-Dec. 2006

    Publication Year: 2006 , Page(s): c1
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  • Table of contents - Vol 25 No 6

    Publication Year: 2006 , Page(s): 1 - 2
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  • A year in review and happy holidays [From the Editor]

    Publication Year: 2006 , Page(s): 4
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  • IEEE Foundation

    Publication Year: 2006 , Page(s): 5
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  • Happenings in Japan and Europe

    Publication Year: 2006 , Page(s): 6 - 8
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  • A portrait of a biomedical engineer as a blogger

    Publication Year: 2006 , Page(s): 9 - 10
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  • Electromyography: Physiology, Engineering, and Noninvasive Applications [Book Review]

    Publication Year: 2006 , Page(s): 11 - 12
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  • How Professionals Make Decisions [Book Review]

    Publication Year: 2006 , Page(s): 12 - 13
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  • Neurophysiological Monitoring During Intensive Care and Surgery [Book Review]

    Publication Year: 2006 , Page(s): 13
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  • Processing interpretation of cardiac signals during atrial fibrillation

    Publication Year: 2006 , Page(s): 14
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  • Electrocardiology of atrial fibrillation

    Publication Year: 2006 , Page(s): 15 - 23
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1262 KB) |  | HTML iconHTML  

    This article provides an overview and discussion of different available electrocardiographic approaches that my prove useful in the clinical management of patients with atrial fibrillation (AF). At the atrial level, characterization of fibrillation waves during AF using spectral analysis techniques or using P-wave signal averaging during (restored) sinus rhythm has been successfully applied in order to monitor and predict outcome of antiarrhythmic drug therapy and cardioversion. At the ventricular level, heart rate variability (HRV) analysis, RR interval histogram, and Poincare plot analysis have been applied to predict AF onset and recurrence. As with the P-SAECG, the majority of recordings were made, however, during sinus rhythm in paroxysmal or after cardioversion in persistent AF. Developments of new and easy-to-use algorithms for fibrillatory wave classification and ventricular response pattern are examples of possible collaboration between clinicians and bioengineers. Hopefully, in the near future, examination of any AF patient will include direct information on individual electrophysiological, structural, and autonomic characteristics that, at the moment, can only be obtained in a limited number of patients View full abstract»

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  • Atrial fibrillation and waveform characterization

    Publication Year: 2006 , Page(s): 24 - 30
    Cited by:  Papers (25)
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    The surface electrocardiogram (ECG) is a convenient, cost effective, and noninvasive tool for the study of atrial fibrillation (AF). It can be used to examine the hypothesized mechanisms of AF as well as to quantify and assess the effect of electrophysiological remodeling and the effectiveness of treatment on different types of AF. Time domain methods can be used to characterize the signal in the surface ECG. The authors described observations that can be obtained directly from the signal, such as the general characteristics of AF in the surface ECG and the ventricular response to AF. A discussion on commonly used methods to characterize atrial activity is also presented. These methods include cancellation techniques, vector analysis, and autocorrelation. Observations show that combining time and frequency domain methods provides a more thorough understanding of the characteristics of the atrial activity in the surface ECG. Whether the study of atrial activity in the surface ECG can be used to distinctively distinguish between different mechanisms of AF is not yet known, but further investigation can improve our understanding of these mechanisms and help with the management of this common arrhythmia View full abstract»

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  • Detection and feature extraction of atrial tachyarrhythmias

    Publication Year: 2006 , Page(s): 31 - 39
    Cited by:  Papers (3)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (853 KB) |  | HTML iconHTML  

    Analysis of atrial tachyarrhythmias requires that an atrial signal has first been extracted from the electrocardiogram (ECG), resulting in the so-called residual ECG. This article introduces a novel method for atrial rhythm analysis that condenses different signal parameters into three rhythm features, reflecting signal structure, frequency regularity, and waveform type. A three-stage method for atrial signal analysis is introduced and comprises atrial signal extraction, atrial signal characterization, and atrial rhythm feature analysis. The present study is example based and illustrates the potential of the method. A quantitative evaluation of the performance of the method will be done in a future study View full abstract»

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  • Processing of intracardiac electrograms in atrial fibrillation

    Publication Year: 2006 , Page(s): 40 - 51
    Cited by:  Papers (3)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1834 KB) |  | HTML iconHTML  

    This paper presents a method for the automated processing of atrial fibrillation (AF) electrograms for the diagnosis of the electropathological substrate of AF and to monitor the effects of ablation procedures and anti-arrhythmic drug treatment on the characteristics of AF. Template matching is a well-known signal processing technique that has been proven useful in various other applications like processing of medical images and fingerprint verification. One of the advantages of this technique is that, because the involved calculations are not very complex, it can easily be applied in real time by using digital hardware. All it requires is the acquisition of fibrillation electrograms, analog-to-digital conversion, and a template matching algorithm downloaded in state-of-the-art digital signal processors. This will provide an objective characterization of fibrillation electrograms that in case of recording of multiple electrograms will produce real-time movies of the propagation of fibrillation waves through the atria. This will allow real-time identification of areas with preferential intra-atrial conduction block, rotor activity, or a focal spread of activation. The further development of algorithms for automatic analysis of fibrillation electrograms, therefore, is not only of scientific interest but may also allow individual evaluation of the atrial substrate, thus providing a basis for selecting the most appropriate treatment of AF View full abstract»

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  • Management of atrial tachyarrhythmias

    Publication Year: 2006 , Page(s): 52 - 62
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1479 KB) |  | HTML iconHTML  

    The prevalence of cardiovascular diseases such as atrial tachyarrhythmias (ATa) has become prevalent worldwide. A discussion on the detection, monitoring, termination, and prevention of ATa is presented. Rhythm control is defined as maintenance of sinus rhythm. One measure of rhythm control is the percent of time spent in atrial tachyarrhythmias, commonly referred to as ATa burden. Rhythm control can be attempted with antiarrhythmic drugs, atrial ablation, or implantable devices. This paper gives attention to the management of ATa using implantable devices. Such devices must detect ATa accurately and either prevent them from recurring or terminate them by using electrical stimulation techniques View full abstract»

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  • Linear and nonlinear coupling between atrial signals

    Publication Year: 2006 , Page(s): 63 - 70
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (485 KB) |  | HTML iconHTML  

    In this article, three methods for the analysis of the relationships among atrial electrical activities in different sites recorded during sinus rhythms (SR) and atrial fibrillation (AF) will be presented and discussed. The properties of pairs of atrial signals (ASs) will be characterized through a linear parameter obtained from the estimation of the cross-correlation (CC) function, using a nonlinear association (NLA) estimator and through a synchronization index based on the corrected cross-conditional entropy (CCE). These parameters will be employed to assess possible changes in the determinism and dynamics of AS induced by adrenergic stimulation, which is supposed, but not yet demonstrated, to promote both spiral wave maintenance and wave break-up thus fragmenting atrial conduction. The sympathetic stimulation is mimicked by isoproterenol infusion, and the effects of this drug are evaluated in a group of patients in four experimental conditions: 1) SR, 2) SR during isoproterenol (SRISO) administration, 3) AF, and 4) AF during isoproterenol administration (AFISO) View full abstract»

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  • Descriptors of wavefront propagation

    Publication Year: 2006 , Page(s): 71 - 78
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1142 KB) |  | HTML iconHTML  

    This article presents two signal processing techniques for the analysis of intracardial electrograins in patients with atrial fibrillation (AF). The first, number of occurrences (NO), is aimed at quantifying the level of organization of the signal. The second, index of synchronization (IS), quantifies the degree of synchrony of electrograms from adjacent atrial sites. The proposed indexes are applied to multielectrode basket catheter recordings in patients with chronic or electrically induced AF View full abstract»

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  • Analysis of electrocardiograms during atrial fibrillation

    Publication Year: 2006 , Page(s): 79 - 88
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1066 KB) |  | HTML iconHTML  

    The research discussed in this article is motivated by the search for an optimal classification of the different types of atrial fibrillation (AF) on the basis of recorded atrial signals. This would facilitate the selection of an optimal therapy. This article focuses on the biophysical models of the genesis of ECG waveforms during AF. The model of the electric activity of the atria was found to have sufficient realism to be used to describe the electric sources during AF. The inclusion of the volume conduction model resulted in electrocardiographic signals that are in all aspects similar to those observed clinically. The model is currently applied to solve various problems related to optimal signal preprocessing and extraction of features in AF signals for the classification of AF abnormalities. The biophysical model of the atrial activity is an essential element in this research, since it is capable of describing the electric source specifications derived from different hypotheses relating to the etiology of AF View full abstract»

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  • The IEEE Engineering in Medicine and Biology Society congratulates the recipients of the 2006 EMBS Awards

    Publication Year: 2006 , Page(s): 89
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  • Design projects

    Publication Year: 2006 , Page(s): 90 - 91
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (58 KB) |  | HTML iconHTML  

    The design project is the most important component of the senior capstone design course. To best prepare students for careers in biomedical engineering, they should be given the opportunity to work on projects with teams that reflect the team environment in an industrial setting. Team composition is important in providing as much of a multidisciplinary team experience as possible. The type of project to which students are assigned should be based on the student's interests and career goals, and the experience and skills they bring to the project View full abstract»

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  • The first experiments on electrical safety

    Publication Year: 2006 , Page(s): 92 - 93
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    This paper discusses the experiments conducted by physicist and physician Arsenne d'Arsonval on the effect of sinusoidal ac on the body, well before the era of electronics. d'Arsonval's first experiments were on the effect of ac on muscle contraction using frog muscle. He contrived a most ingenious device, which displayed the voltage curve and the force of muscle contraction on a smoked-drum kymograph. By using this instrument, along with various alternators such as the Gramme machine, d'Arsonval was able to show that the muscular contraction force decreased with increasing frequency of the electric current. d'Arsonval then turned his attention to the effect of high-frequency ac on the human body. To this end, he created a spark-gap generator of the type described by Hertz in 1888. d'Arsonval demonstrated two important facts: 1) muscle contraction force decreased with increasing frequency of the current and 2) substantial current could be passed through the body and it produced a sensation of warmth. This he proved with conductive and capacitive coupling. By his experiments, d'Arsonval laid the foundation for two new medical techniques: 1) electrosurgery and 2) diathermy. Today both fields are well established in medicine View full abstract»

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  • Vocation: all I ever wonted

    Publication Year: 2006 , Page(s): 94
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  • The 3rd International IEEE EMBS Conference on Neural Engineering - May 2-5, 2007

    Publication Year: 2006 , Page(s): 95
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  • Sex and stem cell research

    Publication Year: 2006 , Page(s): 96 - 98
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    This paper discusses the ethical and political issues that stem cell research faces. Stem cell research holds great promise for treating serious diseases but does so by using materials from the very beginning of life. There is a division among different sects of society as some see a important ethical principle being threatened, while others see scientific progress being threatened by religious beliefs. Medical technology brings the benefits we seek, but it also affects social arrangements. New technologies require that we reweave the threads of social life. It must find a home in our institutions, laws, thinking, and values. In this case, the technology has empowered women in substantial ways, giving them freedom from unwanted or unplanned pregnancies. It has also disconnected the traditional relationships among sex, reproduction, and marriage View full abstract»

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  • Search for Editor-In-Chief - IEEE Transactions on Information Technology in Biomedicine

    Publication Year: 2006 , Page(s): 99
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Aims & Scope

IEEE Engineering in Medicine and Biology Magazine contains articles on current technologies and methods used in biomedical and clinical engineering.

 

This Magazine ceased publication in 2010. The current retitled publication is IEEE Pulse.

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