By James C. Lin
This finished and topical quantity provides a couple of major advances on many fronts during this sector of study, really emphasizing present and destiny biomedical purposes of electromagnetic fields.
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Additional resources for Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems)
1999, Prenatal diagnosis of long QT syndrome using fetal magnetocardiography, Prenatal. , 19(7):677–680. , 2002, Adaptive Filters, Prentice Hall. , Kandori A. , 2001, A case of fetal complete heart block recorded by magnetocardiography, ultrasound and direct fetal electrocardiography, Fetal. Diag. , 16:38–41. , Kandori A. , 2002, prenatal diagnosis of long QT syndrome using magnetocardiography: a case report and review of the literature, Prenat. , 22:198–200. , Miyashita T. , 2001, Detection of cardiac hypertrophy in the fetus by approximation of the current dipole using magnetocardiography, Pediatric.
2 S/m will be a reasonable estimate for the average conductivity of the maternal abdomen. 2. Geometry of the Volume Conductor The fetoabdominal anatomy is depicted in Fig. 15. The volume conductor changes throughout gestation, its electrical properties and geometry depend on gestational age. Since we are interested in the inﬂuence of the volume conductor on the fetal MCG, only the gestational period from the 20th week onward needs to be considered. In order to be able to use the boundary element method to study the inﬂuence of the volume conductor on fetal MCG, the volume conductor has to be described by compartments with a homogeneous conductivity.
Moreover, the vectorcardiograms are not straight lines. When the fetus moves the MCG changes. Phenomenon 2 is ascribed to the insulating effect of the layer of vernix caseosa; a fatty layer that surrounds the fetus and that is present from about week 28 onward. Vectorcardiograms of adults, children, and infants born at term and preterm all demonstrate a heart vector that is rotating during the heart cycle. Presumably, the fetal heart vector is also rotating. A vectorcardiogram displaying a straight line can only be explained by assuming that the volume conduction from the fetal heart to the skin of the maternal abdomen takes place through preferred pathways.
Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems) by James C. Lin