記録条件不良な胎児心電図の一判定方法について

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  • New Methods for the Evaluation of Fetal Electrocardiograms Recorded under Unfavorable Conditions
  • キロク ジョウケン フリョウ ナ タイジ シンデンズ ノ イチ ハンテイ ホウホウ ニ ツイテ

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There are not a few cases in which the existence of the fetal waves can hardly be confirmed because of mixture of noises interfering minute amplitudes of them, but still in such a case the confirmation is seriously demanded clinically. The clinicians face a great difficulty, when the fetal waves are not surely identified, e. g., when they are not apparent either due to the fetal death or to the poor recording system. Therefore, the authors applied the mathematical management to such a hardly understandable recording and obtained better results in the detection of the fetal waves. The first method which the authors have adopted is as follows the soike waves are all marked and 10 sheets of the copies are made. Each of them is set in parallel to each other, with the horizontal deviation of each head of the copies by the time interval of ordinary fetal heart beats. One can see if there appears the dense, vertical lineup of the marks, that is, the autocorrelation is firstly sought and then the existence of the fetal waves is determined. This method is simply carried out only with pencil and sheets of paper. The second method is to find out the fetal waves by electronic computer automatically ; the fetal E. C. G. is put into the data recording, AD converted and moving averages diagrams for each 8 or 32 are made. From the difference of the diagrams the fetal, spike waves are sought. The autocorrelation is obtained and then as in the first method the existence of the fetal waves is determined. These three processings can be performed with the medium hybrid electronic computer, at relatively low expense.

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