A Study on the Electrocardiogram of the Elementary School Children

The authors studied the electrocardiogram of 695 elementary school children (6～11 years old) and the results were as follows: 1) The heart rate of school children was 80～90 beats per minute on average and this was slower than that of 3～5 years old infants. 2) The PQ, QRS and QT intervals were about 0.14 sec, 0.07 sec. and 0.36 sec. respectively. 3) The transitional zone in electrocardiogram for elementary school children were mainly recorded in V_3～V_4 precordial leads. 4) The inverted T waves were generally presented in V_1 and V_2 (46.0% and 35.3% respectively), and also in V_3 (20～23%). 5) The number of incomplete right bundle branch blocks and respiratoric arrythmia was 72 and 115 (10.4% and 16.6%) respectively. 6) As the other abnormal electrocardiographic pattern, the number of complete right bundle branch block supraventricular extrasystole hyperkalemia, left ventricular hypertrophy, right axis deviation and left, axis deviation was respectively 1,12,1,1,4 and 2. 7) The right type, semivertical position and normal axis deviation (from +30° to +90°) were observed commonly. The number of clockwise rotation was 10 and the number of forward rotatation of the apex was 8. 8) The number of children who were of one, two, three or four positive grade on the eye ball pressure test, was 101, 30, 8 and 1 respectively. The sum total of those children who proved positive on the eye ball pressure test occupied 20% in the school children (6～11 years old), while it showed 35％ in the infants (3～5 years old) as was mentioned in the previous paper. 9) The children who were positive on the eye ball pressure test can be classified into the following five types: - i) the incomplete type ………66, ii) the incomplete type ………58, iii) the incomplete combination type………9, iv) the complete type………4, v) the complete arrhythmia type………3