Complementary nature of electrocardiographic and magnetocardiographic data in patients with ischemic heart disease

Lant, John; Stroink, G.; Voorde, Ben ten; Horáček, B. Milan; Montague, Terrence J.

doi:10.1016/0022-0736(90)90121-h

Cited by 55 publications

(36 citation statements)

References 8 publications

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“…23,24 The MCG expressed in µAmpere is comparable with BSPM measured in miniVolts to the extent that the number of recording sites is increased in the latter to a minimum of 120 leads. 25 In the discussion why MCG contributes additional information to the understanding of the heart's electrophysiology, the registration of vortex components of the magnetic field was suggested as the physical explanation. 26 Using this potential for the analysis of spatial aspects of cardiac activity, we could show previously that patients with CAD could be identified at rest because of their increased heterogeneity of repolarization as revealed by temporal and spatial changes of QT dispersion.…”

Section: Discussionmentioning

confidence: 99%

Magnetocardiography in coronary artery disease with a new system in an unshielded setting

Hailer¹,

Chaikovsky²,

Auth‐Eisernitz³

et al. 2003

Clinical Cardiology

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SummaryBackground: The noninvasive detection of coronary artery disease (CAD) remains a clinical challenge. Magnetocardiography is a completely noninvasive method that permits the registration of cardiac electrical activity at multiple sites in a plane above the chest cage without the need for electrodes. In contrast to the electrocardiogram (ECG) which suffers from boundary effects and a variety of potential artifacts (electrode placement, etc.) the MCG is unaffected by such impediments as the magnetic field is unaltered by surrounding tissues.Hypothesis: Magnetocardiography with a newly developed single-channel system in an unshielded setting should be a better qualitative diagnostic tool than the standard ECG for the detection and assessment of CAD.Methods: In all, 52 patients with angiographically documented CAD and unimpaired ventricular function as well as 55 controls were included in this study. A standard 12-lead ECG was obtained in all subjects. The MCG recordings were taken from 36 positions under resting conditions. From these, current density vector maps were generated during the ST-T interval. Each map was then classified using a classification system with a scale from 0 (normal) to 4 (grossly abnormal).

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Section: Discussionmentioning

confidence: 99%

Magnetocardiography in coronary artery disease with a new system in an unshielded setting

Hailer¹,

Chaikovsky²,

Auth‐Eisernitz³

et al. 2003

Clinical Cardiology

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“…MCG is more sensitive to the terminal phase of the depolarization when the activation wavefront occurs in a more tangential direction than at the initial part [53]. ECG (the isointegral BSPM maps) shows abnormalities mainly during the depolarization period, whereas in MCG, better discrimination results from use of the abnormalities in the repolarization period [54]. MCG is also not affected by conductivity variations caused by the lungs, pericardial effusion, muscles, and skin, unlike ECG [51].…”

Section: Main Differences Between Mcg and Ecgmentioning

confidence: 99%

Current Status and Future of Cardiac Mapping in Atrial Fibrillation

Kim¹,

Ahn²

2012

Atrial Fibrillation - Basic Research and Clinical Applications

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“…23 The MCG is also sensitive to circular vortex currents, not detectable by the ECG and it has been shown to contain information complementary to the ECG. 2,9,16 In the normal heart, the main direction of the activation wave front is radial, from the endocardium to the epicardium. Thus the MCG may show deviations from the normal activation direction induced by, e.g., myocardial ischemia with better accuracy than the ECG.…”

Section: Introductionmentioning

confidence: 99%

Magnetocardiographic and Electrocardiographic Exercise Mapping in Healthy Subjects

Takala

Hänninen

Montonen

et al. 2001

Annals of Biomedical Engineering

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Abstract-In 12-lead electrocardiography ͑ECG͒, detection of myocardial ischemia is based on ST-segment changes in exercise testing. Magnetocardiography ͑MCG͒ is a complementary method to the ECG for a noninvasive study of the electric activity of the heart. In the MCG, ST-segment changes due to stress have also been found in healthy subjects. To further study the normal response to exercise, we performed MCG mappings in 12 healthy volunteers during supine bicycle ergometry. We also recorded body surface potential mappings ͑BSPM͒ with 123 channels using the same protocol. In this paper we compare, for the first time, multichannel MCG recorded in bicycle exercise testing with BSPM over the whole thorax in middle-aged healthy subjects. We quantified changes induced by the exercise in the MCG and BSPM with parameters based on signal amplitude, and correlation between signal distributions at rest and after exercise. At the ST-segment and T-wave apex, the exercise induced a magnetic field component outward the precordium and the minimum value of the MCG signal over the mapped area was found to be amplified. The response to exercise was smaller in the BSPM than in the MCG. A negative component in the MCG signal at the repolarization period of the cardiac cycle should be considered as a normal response to exercise. Therefore, maximum ST-segment depression over the mapped area in the MCG may not be an eligible parameter when evaluating the presence of ischemia.

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Complementary nature of electrocardiographic and magnetocardiographic data in patients with ischemic heart disease

Cited by 55 publications

References 8 publications

Magnetocardiography in coronary artery disease with a new system in an unshielded setting

Magnetocardiography in coronary artery disease with a new system in an unshielded setting

Current Status and Future of Cardiac Mapping in Atrial Fibrillation

Magnetocardiographic and Electrocardiographic Exercise Mapping in Healthy Subjects

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