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A Vectorcardiographic Study of Twins Hideo Ueda 1 , Satoru Murao 1 , Kenichi Harumi 1 , Akio Kuroiwa 1 , Hiroshi Matsuo 1 , Mutsuo Yamamoto 1 1The 2nd Department of Internal Medicine, Faculty of Medicine, University of Tokyo pp.959-964
Published Date 1968/11/15
DOI https://doi.org/10.11477/mf.1404201957
  • Abstract
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One hundred pairs of vectorcardiograms of twins, aged 13 to 18, were analyzed in con-sideration of the idea that heredity patterns of monozygotic twins were essentially similar and several electrocardiographic items would be similar in this group.

Vectorcardiograms and three orthogonal scalar electrocardiograms of 43 pairs of mo-nozygotic male twins, 39 pairs of monozygo-tic female, 5 pairs of male and 7 pairs of female of like-sex dizygotic and 6 pairs of not like-sex dizygotic were taken by Frank's lead system at the annual physical examinations.

The items of vectorcardiograms analyzed semi-quantitatively in each pair of twins were the direction of inscription, magnitude, figure and direction of mean vector in QRS and T loops. QRS loop Was analyzed further in the initial, body and terminal portions separately.

The degree of similarity of vectorcardio-grams was higher in the group of monozy-gotic twins (77.4% for male and 78.2% for female) than in the dizygotic twins (64.7%). The fact was more apparent after 15 years of age and was thought to be due to the greater decrease of similarity of vectorcardio-grams of the non-identical twins. The de-gree of similarity of the QRS and T loops decreased as the age increased. There was no marked correlation between the similari-ties of vectorcadiograms and body build. The highest similarity of QRS loop was recogniz-ed in the sagittal plane in both mono-and di-zygotic groups and that of T loops was in the frontal plane.


Copyright © 1968, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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