title: Body surface two-dimensional spectral map of atrial fibrillation using vector-projected 187 channel electrocardiography.
abstract: Atrial cycle length during atrial fibrillation and flutter waves may be correlated with atrial refractoriness and organization. The nature of the frequency by spectral analysis may reflect a profile of atrial cycle length. In this study, we developed a novel body surface 2-dimensional spectral map during fibrillation using vector-projected 187 channel ECG (187ch VP-ECG).The study consisted of 28 patients (24 with atrial fibrillation (AFIB) and 4 atrial flutter (AFL) with valvular heart disease). We performed spectral analysis by maximum entropy modeling (MEM) in 4 second nonaveraged 187ch electrical current waves by 187ch VP-ECG. Body surface spectral features were displayed according to the frequency and power magnitude components. We verified the accuracy of the spectral features by a 64ch magnetocardiography (MCG). The average dominant frequency in AFL by 187ch VP-ECG was lower than those in AFIB (4.6 ± 0.9 Hz in AFL, 7.2 ± 0.9 Hz in AFIB, P < 0.01). Comparison of average dominant frequency between 187ch VP-ECG and 64 ch MCG demonstrated good agreement (y = 0.86x+0.84, r(2) = 0.89, P < 0.0001). Body surface 2-dimensional spectral features demonstrated homogenous spectrum patterns in AFL, and in-homogenous spectrum patterns in AFIB.In conclusion, novel body surface spectral mapping using 187ch VP-ECG may represent a 2-dimensional spectral feature that may be related to atrial refractoriness and organization.
authors.affiliation: Department of Internal Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Nakai
authors.forename: Manabu
authors.initials: M
authors.lastname: Itoh
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Okabayashi
authors.forename: Junichi
authors.initials: J
authors.lastname: Tsuboi
authors.forename: Yoshino
authors.initials: Y
authors.lastname: Mitsunaga
authors.forename: Takashi
authors.initials: T
authors.lastname: Komatsu
authors.forename: Kunihiro
authors.initials: K
authors.lastname: Yoshioka
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001281:Atrial Fibrillation / Q000175:diagnosis*; D001282:Atrial Flutter / Q000175:diagnosis*; D018780:Body Surface Potential Mapping; D005260:Female; D006801:Humans; D053798:Magnetocardiography; D008297:Male; D008875:Middle Aged; D055815:Young Adult