Magnetocardiographic Localization of Kent Bundles

Fenici, Riccardo; Melillo, G; Cappelli, Alessandra; Luca, Claudio De; Masselli, M

doi:10.1007/978-1-4613-0581-1_77

Cited by 12 publications

(14 citation statements)

References 5 publications

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“…Due to its physical advantages, magnetocardiography also permits the non-invasive three dimensional localization of electrical activity within the heart. There have been previous reports on the localization of the accessory bundles in WPW-Syndrome and of arrhythmogenic tissues [4,5,7]. However, these investigations have been performed with systems comprised of just one to a few channels which led to extremely tong recording times.…”

Section: Discussionmentioning

confidence: 95%

Clinical magnetocardiography: Experience with a biomagnetic multichannel system

et al. 1991

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The magnetic fields caused by the human heart's electrical activity were coherently recorded with a biomagnetic multichannel system (KRENIKON) during 1 to 10 minutes in 49 patients. 31 to 37 magnetic channels were recorded simultaneously with the ECG and respiration. Comparison of a magnetic index and the Sokolow-Lyon index to echocardiographic findings in the quantification of left ventricular hypertrophy demonstrated the superiority of the magnetocardiogram (MCG) as compared to the ECG. The magnetocardiographic investigation of patients with WPW-Syndrome, ventricular extrasystoles, ventricular tachycardia, and paced ventricular beats demonstrated that multichannel magnetocardiography permits the non-invasive three dimensional localization of arrhythmogenic tissue with high spatial accuracy.

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Section: Discussionmentioning

confidence: 95%

Clinical magnetocardiography: Experience with a biomagnetic multichannel system

et al. 1991

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“…Non-invasive localization of cardiac arrhythmias, presently the most important application of magnetocardiography, has been reported before [6,8,[19][20][21]. for the current source and the volume conductor), individual patient positioning and the coordinate transfer between MCG and MR imaging.…”

Section: Discussionmentioning

confidence: 99%

“…Based on 84 measurements, a mean spatial error for localization of the electric stimulus of 7.1 mm (s --6.2 nun) was found along the x-axis (left to right), 6.0 mm (s = 3.3 mm) along the y-axis (cranial to caudal), and 3.5 mm (s = 2.8 nun) along the z-axis (ventral to dorsal). This corresponds to an overall spatial error of 11.5 mm (s = 5.2 ram) (see Table 2).…”

Section: Cardiac Pacing In Patientsmentioning

confidence: 99%

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Evaluation of the non-invasive localization accuracy of cardiac arrhythmias attainable by multichannel magnetocardiography (MCG)

et al. 1996

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The accuracy of multichannel magnetocardiography (MCG) for the non-invasive localization of cardiac arrhythmias was investigated. A non-magnetic catheter was used in phantom studies and for cardiac pacing of 6 patients. In a clinical setting, 32 patients with WPW-syndrome, 37 patients with premature ventricular complexes and 12 patients with ventricular tachycardia were studied and the MCG results compared to reference methods, including invasive electrophysiological mapping. Phantom and pacing studies demonstrated the spatial localization accuracy to be better than 15 mm for a dipole-to-dewar distance below 15 cm. In all patients with structural cardiac disease, the ectopic focus was localized at the margin of the damaged area, serving as a proof of MCG localization. Invasive mapping confirmed the MCG result whenever performed (42 patients). In 11 patients (9 WPW, 2 VT) the MCG localization result was verified by successful HF catheter ablation as a gold standard. MCG permits the non-invasive localization of cardiac arrhythmias with high spatial accuracy. MCG guided HF catheter ablation constitutes a new concept of non-invasive localization and minimally invasive causal therapy.

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“…Subsequently the reproducibility of localization accuracy of ventricular arrhythmias was demonstrated in a longitudinal study [13,15,16] 16/20 pts with non sustained VT) were restudied at least twice to test the reproducibility of MCG pattern during the VT and to verify whether or not MCG localization of the site of origin of single extrasystoles of the same morphology as VT could be used to localize the site of onset of the sustained arrhythmia. In Fig.…”

Section: Ventricular Arrhythmiasmentioning

confidence: 99%

Clinical magnetocardiography

1991

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Since the introduction, in 1982, of a Biomagnetic facility in the clinical environment, efforts were concentrated to investigate whether magnetocardiography could really provide new information of potential diagnostic use, even avoiding electromagnetic shielding to facilitate simultaneous biomagnetic and conventional cardiac investigations, including cardiac catheterization for invasive electrophysiological procedures. More than 350 patients have been magnetically investigated using a single-channel second-order gradiometer. Results of 281 MCG studies, whose data have been extensively analyzed with updated software programs, are reported. Magnetocardiographic (MCG) mapping during endocardial pacing was performed to quantify the accuracy of MCG localization of intracardiac dipolar sources. MCG classification of ventricular preexcitation has been attempted in 70 patients with overt preexcitation. MCG localization of the ventricular preexcited area was accurate and reproducible, provided that during mapping a sufficient degree of ventricular preexcitation was present. MCG mapping during orthodromic A-V re-entry tachycardia has been also employed to attempt the localization of retrograde atrial preexcitation as well as the site of origin of atrial and ventricular tachyarrhythmias. For validation, the results of catheter and epicardial mappings have been used. Other applications of clinical magnetocardiography are under evaluation. The use of the Relative smoothness index needs, in our opinion, a larger experience to define its reliability as a predictor of risk for sudden death. MCG follow-up study of patients with transplanted hearts seems to be a promising application, for early detection of acute graft rejection reaction. Our reported case strongly supports this potentiality. Present work is also addressed to develop an integrated system allowing easy MCG mapping during cardiac catheterization, as a new method to guide diagnostic and therapeutic procedures as close as possible to the arrhythmogenic substrate.

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Magnetocardiographic Localization of Kent Bundles

Cited by 12 publications

References 5 publications

Clinical magnetocardiography: Experience with a biomagnetic multichannel system

Clinical magnetocardiography: Experience with a biomagnetic multichannel system

Evaluation of the non-invasive localization accuracy of cardiac arrhythmias attainable by multichannel magnetocardiography (MCG)

Clinical magnetocardiography

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