三次元心磁図計測に基づく運動負荷による心筋活動の検討(生体磁気)

概要

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We performed three-dimensional vector measurements of exercise-induced magnetocardiograms (MCGs) of normal subjects, using a bicycle ergometer made of wood. MCGs were measured by a three-dimensional, second-order gradiometer connected to 39-channel SQUIDs, which can detect magnetic components both perpendicular to the chest wall (B_z) and tangential to the chest wall (B_x, B_y) simultaneously. These measurements were made to compare exercise-induced MCGs of normal subjects in the state of each having various R-R intervals (400 to 600 ms) with the those in the state of a stable R-R interval (control). We analyzed MCG data at each R-R interval for normal subjects using power differential ratio (PDR). For a QRS segment, power at each of various R-R intervals is smaller than power at the control state. For an ST-T segment, power at each of various R-R intervals is larger than power at the control. In normal subjects, the power map in the state of each having various R-R intervals was compared with that in the control state based on correlation coefficient. The results confirmed the difference in heart activity.
社団法人日本磁気学会の論文
2003-04-01