1) The notch igs found in QRS group are all of the 15 normal electrocardiogram recorded with the cathode ray oscillograph. 2) The notchings are found least in the 2nd lead, in which over half of the cases have no notching, on the other hand in the 3rd lead all of them except 1 have notchings and some of them in high degree. 3) In the 2nd lead all cases and in 1st lead almost all the notchings are found in the upper part of the R wave. On the other hand in the 3rd lead the notchings appear sometimes at the beginning of the Q wave and about the end of the S wave, and are varied. 4) No certain time relation between the notchings in the QRS group can be found in any lead. 5) According to the results of Grocdd's experiment the right arm coresponds to the sinus node, and the left arm and the left leg are electrically not pure and their voltage are compounds of the action voltage of the left and right ventricles. So the notching of the 1st and 2nd leads can be recognized, and the fact that the notchings of the 3rd lead are various and most evident can be explained. Also it can be recognized that the author could not find any definite time relation between these notchings. 6) From the fact that almost all cases have many notchings in the QBS group, the theory of Bohnenkamp, that the ventricular complex is explained by the compound of the two upward and the downward monophasic curves, is not correct. 7) It is not proper at this time to decide the damage of the stimulus conductions system only by the notchings of the QRS group.
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