title: Three-dimensional spectral map of atrial fibrillation by a 64-channel magnetocardiogram.
abstract: We verified the significance of 3-dimensional (3D) spectral mapping during atrial fibrillation (AFIB) using a 64-channel magnetocardiogram (MCG). The study consisted of 16 patients with valvular heart disease who had chronic AFIB. All 16 patients had surgical pulmonary vein (PV) isolation followed by valvular repair. We performed spectral mapping by fast Fourier transform analysis in nonaveraged 64-channel MCG data. The 3D spectral map was superimposed on a 3D heart polygon. At 1 year after surgical PV isolation for AFIB, followed by valve repair, 7 patients had restoration to sinus rhythm, and 9 patients remained in persistent AFIB. The preoperative mean 3D frequency of AFIB was 6.1 +/- 0.9 Hz in patients with restored sinus rhythm and 7.2 +/- 0.7 Hz in patients with sustained AFIB after PV isolation (P = .02). In addition, the preoperative 3D spectrum was distributed on the right side of the heart in patients with persistent AFIB. In conclusion, 3D spectral mapping using 64-channel MCG may represent a meaningful noninvasive strategy for patients with AFIB who receive an interventional procedure.
authors: Department of Laboratory Medicine, Iwate University, Morioka, Japan. knakai@iwate-med.ac.jp
authors: Kenji
authors: K
authors: Nakai
authors: Takanori
authors: T
authors: Oka
authors: Hitoshi
authors: H
authors: Okabayashi
authors: Junichi
authors: J
authors: Tsuboi
authors: Yoshiaki
authors: Y
authors: Fukuhiro
authors: Akimune
authors: A
authors: Fukushima
authors: Akira
authors: A
authors: Suwabe
authors: Manabu
authors: M
authors: Itoh
authors: Masahito
authors: M
authors: Yoshizawa
mesh_terms: D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000175:diagnosis*; D018780:Body Surface Potential Mapping / Q000379:methods*; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D015225:Magnetoencephalography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity