Magnetocardiographic non-invasive localization of accessory pathways in the Wolff-Parkinson-White syndrome by a multichannel system

Weismüller, P.; Abraham-Fuchs, K.; Schneider, Siegfried; Richter, Péter; Kochs, M.; Hombach, Vinzenz

doi:10.1093/oxfordjournals.eurheartj.a060224

Cited by 33 publications

(17 citation statements)

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“…Although MCGs have unique fundamental principles, can be quantified using absolute scales [4] , and are less affected by the body tissues compared with 12-lead electrocardiograms (ECGs) [5] , their clinical utility has not been established. Several reports have described MCGs studies of His potentials [6,7] , ventricular repolarization abnormalities during sinus rhythm [8][9][10] , and arrhythmic foci in patients with premature contractions or Wolff-Parkinson-White syndrome [11][12][13][14] . However, there are very few MCG studies of reentrant arrhythmias.…”

Section: Introductionmentioning

confidence: 99%

Noninvasive, direct visualization of macro-reentrant circuits by using magnetocardiograms: initiation and persistence of atrial flutter

et al. 2003

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Aims We analysed the cardiac magnetic fields on the body surface to visualize electrical currents noninvasively during reentrant arrhythmias.Methods and results Seven patients with counterclockwise atrial flutter (AFL) were studied during 17 episodes of AFL using 64-channel magnetocardiograms (MCGs) and electrophysiological study. Eight of the episodes were paroxysmal AFL, in which MCGs were recorded from the time of spontaneous onset to the time of termination. We constructed iso-magnetic field maps of the tangential components and produced MCG animations. With respect to AFL initiation, an atrial premature complex induced AFL. Prior to the initiation of AFL, atrial fibrillation (AF) transiently occurred. The cardiac magnetic fields revealed a single peak during sinus rhythm or with premature complexes but a disorganized pattern during AF. When AF transformed to AFL, the magnetic fields changed from a disorganized pattern to a single peak at first and then evolved to a circular pattern. During persistent AFL, the magnetic source moved in a counterclockwise circuit.Conclusion MCG animation can be used to visualize the sequence in which a premature complex transforms sinus rhythm to AFL via AF. Our findings indicate that MCGs can be used to identify noninvasively the mechanisms responsible for atrial tachyarrhythmias.

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Section: Introductionmentioning

confidence: 99%

Noninvasive, direct visualization of macro-reentrant circuits by using magnetocardiograms: initiation and persistence of atrial flutter

et al. 2003

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“…However, in 1998, using the Helsinki multichannel system with an acceptable signal-to-noise ratio, Fenici et al demonstrated that MCG is an effective clinical tool for non-invasive threedimensional electro-anatomical imaging [41]. Accurate localization of the accessory pathway has been successfully performed in patients with Wolf-ParkinsonWhite (WPW) syndrome [42][43][44][45][46]. In these studies the accuracy of the non-invasive MCG localization of arrhythmogenic substrates has been evaluated by comparison with the results of conventional invasive catheter mapping.…”

Section: Rozkład Prądów Nasierdziowych U Pacjenta Z Ciasnym Zwężenimentioning

confidence: 99%

Special article Magnetocardiography in clinical cardiology. Status quo and future applications

Leithäuser¹,

Jung²,

Park³

2011

pwki

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215Magnetocardiography in clinical cardiology. Status quo and future applications Magnetokardiografia w kardiologii klinicznej. Stan obecny i przyszłe zastosowania B Bo or ri is s L Le ei it th hä äu us se er r 1 1 , , F Fr ri ie ed dr ri ic ch h J Ju un ng g 2 2 , , J Ja ai i--W Wu un n P Pa ar rk k Special article/Artykuł specjalny A b s t r a c tMagnetocardiography (MCG) is a non-contact, non-invasive technique for the assessment of electromagnetic activity of the human heart. Theoretical considerations and comparative studies indicate different information content between MCG and electrocardiography (ECG). Although many questions about cardiac pathophysiology and electrophysiology can be answered by MCG studies, measurement of biomagnetism is still only marginally recognized as a valuable tool. Although MCG instrumentation (SQUIDs, MSR) and operation (liquid helium) are expensive and not available at the bedside, the gain of information drawn from the cardiac magnetic field is worth the effort. The MCG has superior sensitivity for ischaemic myocardium both at rest and under stress. Therefore, it may change one's ideas of decision making about invasive procedures. Compared to scintigraphy, which is a cumbersome method with the need of radioactivity exposure to the patient, MCG is as easy as bicycle ergometry but with higher sensitivity. In terms of risk stratification for sudden cardiac death, it seems to be possible that MCG in the future will provide additional information as to which patient will not benefit from prophylactic defibrillator implantation. However, appropriate clinical studies are lacking. Most interestingly, MCG appears to be practical and informative in the diagnosis of cardiac arrhythmias, and has sufficient spatial accuracy necessary for clinical purposes. It seems realistic that MCG-based localization of arrhythmogenic spots may guide the operator's ablation catheter, e.g. in patients with relapsing AF after a first successful ablation procedure. There is enough room for fantasy which question in clinical cardiology remains to be answered by MCG. K Ke ey y w wo or rd ds s: : magnetocardiography, coronary heart disease, ischaemia, risk stratification, arrhythmia, atrial fibrillation S t r e s z c z e n i e Magnetokardiografia (ang. magnetocardiography, MCG) jest bezkontaktową, nieinwazyjną metodą pomiaru pola magnetycznego ludzkiego serca. Założenia teoretyczne oraz badania porównawcze wskazują, że MCG i EKG dostarczają odmiennych informacji. Pomiar pola magnetycznego jest nadal w niewielkim stopniu uważany za wartościowe narzędzie, pomimo że badania MCG mogą udzielić odpowiedzi na wiele pytań dotyczących patofizjologii serca i elektrofizjologii. Chociaż oprzyrządowanie konieczne do MCG (SQUIDs, MSR) i jego obsłu-ga (ciekły hel) są drogie i nie są dostępne jako badania przyłóżkowe, to informacja uzyskiwana z badań pola magnetycznego serca jest warta tych wysiłków. Magnetokardiografia charakteryzuje się większą czułością w wykrywaniu niedokrwienia miokardium zarówno w warunkach spoczynkow...

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“…Since superconducting multi-channel systems have become available, the cardiac magnetic field can be recorded with great sensitivity simultaneously from a number of positions over the chest (Pasquarelli andDi Luzio1993, Tavarozzi et al 2002a), hence allowing accurate field mapping during the cardiac cycle, useful for several clinical applications, particularly for arrhythmias (Weismuller et al 1992, Brockmeier et al 1997, Muller et al 1999, Hren et al 1999, Kandori et al 2001, Comani et al 2001, 2004a, Tavarozzi et al 2002b.…”

Section: Introductionmentioning

confidence: 99%

Fetal magnetocardiographic mapping using independent component analysis

Comani¹,

Mantini²,

Alleva³

et al. 2004

Physiol. Meas.

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Fetal magnetocardiography (fMCG) is the only noninvasive technique allowing effective assessment of fetal cardiac electrical activity during the prenatal period. The reconstruction of reliable magnetic field mapping associated with fetal heart activity would allow three-dimensional source localization. The efficiency of independent component analysis (ICA) in restoring reliable fetal traces from multichannel fMCG has already been demonstrated. In this paper, we describe a method of reconstructing a complete set of fetal signals hidden in multichannel fMCG preserving their correct spatial distribution, waveform, polarity and amplitude. Fetal independent components, retrieved with an ICA algorithm (FastICA), were interpolated (fICI method) using information gathered during FastICA iterations. The restored fetal signals were used to reconstruct accurate magnetic mapping for every millisecond during the average beat. The procedure was validated on fMCG recorded from the 22nd gestational week onward with a multichannel MCG system working in a shielded room. The interpolated traces were compared with those obtained with a standard technique, and the consistency of fetal mapping was checked evaluating source localizations relative to fetal echocardiographic information. Good magnetic field distributions during the P-QRS-T waves were attained with fICI for all gestational periods; their reliability was confirmed by threedimensional source localizations.

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Magnetocardiographic non-invasive localization of accessory pathways in the Wolff-Parkinson-White syndrome by a multichannel system

Cited by 33 publications

References 0 publications

Noninvasive, direct visualization of macro-reentrant circuits by using magnetocardiograms: initiation and persistence of atrial flutter

Noninvasive, direct visualization of macro-reentrant circuits by using magnetocardiograms: initiation and persistence of atrial flutter

Special article Magnetocardiography in clinical cardiology. Status quo and future applications

Fetal magnetocardiographic mapping using independent component analysis

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