title: Space-time database for standardization of adult magnetocardiogram-making standard MCG parameters.
abstract: BACKGROUND
  The magnetocardiogram (MCG) is a promising medical tool for detecting and visualizing abnormal cardiac electrical activation in heart-disease patients. However, there is no large-scale MCG database of healthy subjects, and there is little knowledge of gender- and age-related influences on MCG data.
  
  
  RESULTS
  We obtained MCG data from 869 subjects (554 men, 315 women) using a conventional 64-channel MCG system, which covers the whole heart. Electrocardiogram (ECG) data were also obtained; 464 people (268 men, 196 women) were identified as a normal group using ECG data. Time intervals (PQ, QRS, QT, and QTc), current distributions (maximum current vector (MCV), and the total current vector (TCV)) of MCG data of the 464 normal subjects were analyzed to obtain basic MCG parameters. Although mean values of PQ and QRS intervals of the male subjects were slightly longer than those of the female subjects, no intervals were correlated with gender or age. The correlation between PQ intervals of ECG and those of MCG was better than the correlation between QRS and QT intervals of ECG and those of MCG. Both MCV and TCV angles were much smaller than the electrical-axis angle in ECG. Although TCVs of the QRS and T waves were stable, the women's mean T-wave-TCV angles significantly increased with age. The maximum amplitude of the P wave was about 1.7 pT, and the value of the QRS complex was about 20-25 pT. Moreover, the T-wave amplitude decreases with age.
  
  
  CONCLUSIONS
  The MCG standard space-time parameters determined here provide a normal range for MCG parameters.
authors: Advanced Research Laboratory, Hitachi Ltd., Kokubunji, Tokyo, Tokyo. akihiko.kandori.vc@hitachi.com
authors: Akihiko
authors: A
authors: Kandori
authors: Kuniomi
authors: K
authors: Ogata
authors: Yasushi
authors: Y
authors: Watanabe
authors: Noriko
authors: N
authors: Takuma
authors: Kimio
authors: K
authors: Tanaka
authors: Masahiro
authors: M
authors: Murakami
authors: Tsuyoshi
authors: T
authors: Miyashita
authors: Nobuo
authors: N
authors: Sasaki
authors: Yuji
authors: Y
authors: Oka
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016208:Databases, Factual; D005260:Female; D006329:Heart Conduction System / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D007564:Japan; D053798:Magnetocardiography / Q000592:standards*; D008297:Male; D016347:Medical Records Systems, Computerized; D008875:Middle Aged