Detection of atrial-flutter and atrial-fibrillation waveforms by fetal magnetocardiogram

A. Kandori, T. Hosono, T. Kanagawa, S. Miyashita, Y. Chiba, M. Murakami, T. Miyashita, Keiji Tsukada

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Two cases of fetal tachycardia are reported: atrial flutter and fibrillation. The waveforms from each case were detected by fetal magnetocardiograms (FMCGs) using a 64-channel superconducting quantum interference device (SQUID) system. Because the magnitude of supraventricular arrhythmia signals is very weak, two subtraction methods were used to detect the fetal MCG waveforms: subtraction of the maternal MCG signal, and subtraction of the fetal QRS complex signal. It was found that atrial-flutter waveforms showed a cyclic pattern and that atrial-fibrillation waveforms showed f-waves with a random atrial rhythm. Fast Fourier transform analysis determined the main frequency of the atrial flutter to be about 7 Hz, and the frequency distribution of atrial fibrillation consisted of small, broad peaks. To visualise the current pattern, current-arrow maps, which simplify the observation of pseudo-current patterns in fetal hearts, of the averaged atrial flutter and fibrillation waveforms were produced. The map of the atrial flutter had a circular pattern, indicating a re-entry circuit, and the map of the atrial fibrillation indicated one wavelet, which was produced by a micro-re-entry circuit. It is thus concluded that an FMCG can detect supraventricular arrhythmia, which can be characterised by re-entry circuits, in fetuses.

Original languageEnglish
Pages (from-to)213-217
Number of pages5
JournalMedical & Biological Engineering & Computing
Volume40
Issue number2
DOIs
Publication statusPublished - Mar 2002
Externally publishedYes

Fingerprint

Atrial Flutter
Reentry
Atrial Fibrillation
Networks (circuits)
Fourier Analysis
Flutter (aerodynamics)
SQUIDs
Cardiac Arrhythmias
Fast Fourier transforms
Fetal Heart
Tachycardia
Fetus
Mothers
Observation
Equipment and Supplies

Keywords

  • Atrial fibrillation
  • Atrial flutter
  • Fetal magnetocardiogram

ASJC Scopus subject areas

  • Health Information Management
  • Health Informatics
  • Biomedical Engineering
  • Computer Science Applications
  • Computational Theory and Mathematics

Cite this

Detection of atrial-flutter and atrial-fibrillation waveforms by fetal magnetocardiogram. / Kandori, A.; Hosono, T.; Kanagawa, T.; Miyashita, S.; Chiba, Y.; Murakami, M.; Miyashita, T.; Tsukada, Keiji.

In: Medical & Biological Engineering & Computing, Vol. 40, No. 2, 03.2002, p. 213-217.

Research output: Contribution to journalArticle

Kandori, A, Hosono, T, Kanagawa, T, Miyashita, S, Chiba, Y, Murakami, M, Miyashita, T & Tsukada, K 2002, 'Detection of atrial-flutter and atrial-fibrillation waveforms by fetal magnetocardiogram', Medical & Biological Engineering & Computing, vol. 40, no. 2, pp. 213-217. https://doi.org/10.1007/BF02348127
Kandori, A. ; Hosono, T. ; Kanagawa, T. ; Miyashita, S. ; Chiba, Y. ; Murakami, M. ; Miyashita, T. ; Tsukada, Keiji. / Detection of atrial-flutter and atrial-fibrillation waveforms by fetal magnetocardiogram. In: Medical & Biological Engineering & Computing. 2002 ; Vol. 40, No. 2. pp. 213-217.
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