High-resolution isofield mapping in magnetocardiography

Erné, S. N.; Fenici, Riccardo; Hahlbohm, H. D.; Jaszczuk, W.; Lehmann, H.; Masselli, M

doi:10.1007/bf02455932

Cited by 21 publications

(8 citation statements)

References 6 publications

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“…The Maps Correlation module hast wo major features: isofield mapr econstructions and estimation of correlation coefficients between subsequent fieldd istributions along the averagecardiac cycles at preset time intervals.These functions areparticularlyuseful for the assessmentofventricularrepolarization [17][18][19][20]22]. In fact,ventricularrepolarization abnormalities -not revealed with conventional ECG-a re expressed as unevenc hangeso ft he fieldd istribution throughoutthe ST segment [22,48,49]. An automatedm odule devotedt oe valuate the stability of ventricularrepolarization can be based on the computation of subsequent fieldm apsc alculatedd uring the interval corresponding to the ST segment, whichcan be marked on ar eference MCGt race displayedinthe frame on the right bottom side of the window.…”

Section: Resultsmentioning

confidence: 99%

Integrated Software Suite for Magnetocardio-graphic Data Analysis

Comani¹,

Mantini²,

Merlino³

et al. 2005

Methods Inf Med

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Section: Resultsmentioning

confidence: 99%

Integrated Software Suite for Magnetocardio-graphic Data Analysis

Comani¹,

Mantini²,

Merlino³

et al. 2005

Methods Inf Med

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“…The electrical late potentials and magnetic signals were synchronous, so that the magnetic deflections could be detected as related to the post-excitation syndrome. Results in mapping structures in the ST-segment were reported in [6] and [7].…”

Section: Introductionmentioning

confidence: 84%

Analysis of the ST-segment in terms of principal components: application on multichannel magnetocardiographic recordings

Schless

Müller

Demelis

et al. 2004

Journal of Medical Engineering & Technology

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Parameterization of the ST-segment is used as a tool for risk stratification for patients to suffer from ventricular tachycardia. This parameterization is performed in terms of Principal Component Analysis (PCA) applied on multichannel magnetocardiographic (MCG) recordings. 55-channel MCG was recorded from 14 normal persons, 10 patients with CHD, 14 patients with MI, and six patients with VT. We found a significantly (p < 0.05) lower PCA-score in patients with MI compared to normals. The lowest PCA-score was found in VT patients. Significant differences can be found between VT patients and normals and also between VT patients and CHD patients.

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“…Therefore, in these patients the site of the VT-focus was assessed by surface ECG criteria, as suggested by Josephson et al [14]. In 2/5 patients with successful catheter mapping the area of the suggested VT focus was 229 identical with the two methods, in one patient the area of initial contraction within the ISPECT frame was adjacent to the area found by intracardiac catheter mapping.…”

Section: Vt Patientsmentioning

confidence: 99%

Localization of ectopic ventricular depolarization by ISPECT-radionuclide ventriculography and by magnetocardiography

et al. 1991

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Since catheter or surgical techniques for ablating the arrhythmogenic substrate in patients with SVT due to accessory pathways or those with VT are now available, exact localization of the substrate is mandatory. We report preliminary results of two new non-invasive techniques for localizing either the site of earliest ventricular contraction using ISPECT, or the site of initial ventricular depolarization by magnetocardiography (MCG) in WPW syndrome and in VT patients. Thirteen patients with WPW syndrome and 8 patients with sustained VTs were studied with ISPECT. In 9/13, comparative catheter mapping data were available. Two patients had two Kent bundles. 13/15 Kent bundles could be localized by ISPECT. In 5/9 patients the area of Kent bundle insertion was identical with ISPECT and catheter mapping, in 3 correlation was fair, and in 2 patients with 2 Kent bundles ISPECT failed to localize their insertion. In 3/8 patients with VT catheter mapping could not be performed for hemodynamic reasons. In 2/5 patients the area of VT focus was identical with both methods, in one patient it was adjacent to each other, and in 2/5 patients a larger anatomic distance of the focus was found with both methods. In 3/7 patients with WPW the MCG showed the site of Kent bundle insertion, which was identical to that seen by catheter mapping. In one patient the area was adjacent, and in 3 more distant from the site determined by catheter mapping. In 1/2 patients with 2 Kent bundles, one of these could be detected by MCG. In 1/3 patients with VT, the site of VT focus was identical with both methods, but in the remaining two a distance of 3-4 cm was observed between the area seen with MCG and that with catheter mapping. In 4 further VT patients with stable and uniform ventricular late potentials, ventricular late magnetic activity was found with different QRS lengths within the single MCG channels. From our results we conclude that both ISPECT and MCG seem to become very promising non-invasive techniques for localizing ectopic ventricular depolarization in WPW syndrome and VT patients. However, these methods have to be refined, improved and validated by further systematical studies.

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High-resolution isofield mapping in magnetocardiography

Cited by 21 publications

References 6 publications

Integrated Software Suite for Magnetocardio-graphic Data Analysis

Integrated Software Suite for Magnetocardio-graphic Data Analysis

Analysis of the ST-segment in terms of principal components: application on multichannel magnetocardiographic recordings

Localization of ectopic ventricular depolarization by ISPECT-radionuclide ventriculography and by magnetocardiography

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