学童 (13才児及び14才児) の心電図学的研究 : (第1報)正常値
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概要
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Through the consecutive annual physical examination of four years' duration on the school children of the city of Otsu, we selected out 653 healthy children without evidence of heart disease, classified their electrocardiograms according to age, sex, heart position of WILSON and position of transitional zone, and measured amplitudes and durations of each deflection of these electrocardiograms. The criteria of the absence of heart disease were those of ZIEGLER. Thus maximum, minimum, mean, standard deviation and percentile distributions (upper: 97.5 percentile, lower: 2.5 percentile) were calculated and their normal values were decided. Percentile distributions were calculated according to the formula A of the appendix in SIMONSON'S monograph. This study consisted of 307 children of 13 years of age and 346 of 14 years of age. By means of these procedures the following results were obtained. 1 . Vertical and semi-vertical heart position of WILSON were predominant (93.1%) and transitional zone to the right of lead V_4 (CR-and CM position), namely counterclockwise rotation around the longitudinal axis of the heart were quite frequently observed (88.0%). (In this paper we classify these two positions (vertical and semi-vertical) into one oosition and call this position 'vertical heart position'). Consequently vertical heart position and counterclockwise rotation around the long axis of the heart were almost constantly observed in these age groups. 2. In respect to the amplitudes of the R and S waves, the heights and/or depths were greater in the male children than in the female children in almost all the leads (p≦0.01). And also these values were greater in the 13 year-old girls than in the 14 year-old girls, perhaps due to the rapid development of sub-cutaneous fat tissues in these age groups (p≦ 0.01). 3. In the present study the mean values of the amplitudes of the R and S waves in the chest leads were greater than those of Koss-MANN, ZIEGLER, and SOKOLOW-LYON (p≦0.01). The upper limits (97.5 percentile) obtained by us were roughly identical with maximal normal values between 10 and 20 years of age proposed by KOSSMANN, but our results exhibited much greater values than those of maximal normals of SOKOLOW and FRIEDLANDER.
- 1966-05-20
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