Non-dipolarity of Heart Potentials Estimated by Magnetocardiography in Normal Subjects.
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- IZUMIDA Naomi
- Department of Pediatrics, School of Medicine, Tokyo Medical and Dental University
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- ASANO Yuh
- Department of Pediatrics, School of Medicine, Tokyo Medical and Dental University
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- HOSAKI Junro
- School of Allied Health Sciences, Tokyo Medical and Dental University
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- HIYOSHI Yasunaga
- Department of Cardiology, Tokyo Metropolitan Hiroo Hospital
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- SAKURADA Harumizu
- Department of Cardiology, Tokyo Metropolitan Hiroo Hospital
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- MOTOMIYA Takeshi
- Department of Cardiology, Tokyo Metropolitan Hiroo Hospital
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- KAWANO Seiko
- Department of Cardiovascular Disease, Medical Research Institute, Tokyo Medical and Dental University
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- SAWANOBORI Tohru
- Department of Cardiovascular Disease, Medical Research Institute, Tokyo Medical and Dental University
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- HIRAOKA Masayasu
- Department of Cardiovascular Disease, Medical Research Institute, Tokyo Medical and Dental University
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抄録
We studied non-dipolarity characteristics during ventricular excitation in normal adults and children by magnetocardiography (MCG) by recording magnetic field on the thorax. The source and currents of the electrical dipole from the onset up to 60ms of ventricular excitation were analyzed in 16 adults and 5 children. A single equivalent current dipole (ECD) was estimated by Sarvas' formula for the sphere model at 1ms intervals. The non-dipole value (NDV) was calculated from the magnetic field strength at each recording point and theoretically estimated by ECD, representing an index for the nondipolarity. At 32-34ms from the beginning of QRS, the mean NDV was a minimum in all subjects suggesting at least a non-dipole component during this period. High NDV (over 5%) were present in most subjects in both the early and late phase compared to this period. Thirteen of 16 adults had a high NDV in the early phase (9.3±3.0%, mean±SD) and all 16 subjects had a high NDV in the late phase (21.5±10.5%). All 5 children had high NDV in both the early (10.5±5.4%) and late phases (16.8±7.9%). A single ECD estimation by MCG showed a relatively low non dipolar component and MCG could be applied to the clinical evaluation of cardiac excitation in both normal and pathological conditions.
収録刊行物
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- Ｊａｐａｎｅｓｅ Ｈｅａｒｔ Ｊｏｕｒｎａｌ
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Ｊａｐａｎｅｓｅ Ｈｅａｒｔ Ｊｏｕｒｎａｌ 39 (6), 731-742, 1998
International Heart Journal刊行会