著者

上松 弘明 森 博愛

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.11, no.2, pp.78-85, 1973-04-30 (Released:2011-07-05)

参考文献数

8

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Validity of Fourier coefficients as parameters for the electrocardiographic pattern recognition by means of the threshold logic units and the maximum likelihood method was verified. As the traditional methods of Fourier transform required much time, a new method of fast Fourier transform of folding type, which differed from FFT of Cooley and Tukey, was developed. Sampling points used in the present investigations totaled 100. Using scalar ECG of Frank's orthogonal system (X, Y and Z leads) 15 normal subjects, myocardial infarction cases and ostium secundum type of atrial septal defect cases respectively were analyzed by this new method, and the coefficients such as An, Bn, √An2+Bn2 and Arctan (An/Bn) were obtained.√An2+Bn2 was considered as the most useful parameter among them, because it is invariant for the parallel shift of amplitude and time axis.Normals, myocardial infarction and atrial septal defect cases were classified, in 100 per cent success, by threshold logic units and maximum likelihood method in the twelve dimensional information space, respectively using the initial four Fourier coefficients of the X, Y and Z leads as parameters.Fourier coefficient parameters were estimated by t-tests, and then the effort was made to reduce the numbers of parameters of information space.Complete separation was also obtained even when the number of dimension were reduced to seven by using the initial seven Fourier coefficients of X lead alone. This suggested that the important diagnostic information was mostly contained in X lead, and also that the lower harmonic components had the greater part of the information of ECG. Nonlinear discriminant function played an important role in the low dimensional information space.

著者

森 博愛 小林 総一郎 毛利 三郎

出版者

一般社団法人 日本老年医学会

雑誌

日本老年医学会雑誌 (ISSN:03009173)

巻号頁・発行日

vol.29, no.4, pp.293-297, 1992-04-25 (Released:2009-11-24)

参考文献数

20

被引用文献数

3 5

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左脚分枝ブロックの1型である左脚中隔枝ブロックの際には, 横断面QRS軸の方向が変化し, QRS波前方成分が増大する. 健常例のV1, 2のQRS波計測値に基づき, 下記のような左脚中隔枝ブロックの心電図診断基準を設定した.(1) 右室肥大, 完全右脚ブロック, WPW症候群 (A型), 高位後壁梗塞, 肥大型心筋症, 心臓長軸周りの著しい反時針式回転を起こすような胸郭ないし胸郭内異常を除外する.(2) 次の2項目の内, 何れか1つを満たす.(1) V1のR/S>2, かつRV1≧5mm, (2) V2のR/S>2, かつRV2≧15mmまたはSV2<5mm高年者を主対象とする病院の全入院患者における本所見の頻度は3.5%で, 左脚前枝ブロック, 完全右脚ブロックより少ないが, 完全左脚ブロック, 両脚ブロックよりも多く, 高年者の異常心電図所見の1つとして注意を払う必要がある.