電氣的收縮期間に關する研究(第1報) : 第1編 臨床統計學的研究 : 第1章 本邦成人に於ける正常QT時間に就て
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On the normal duration of the Q-T interval in Europeans and Americans various formulas have been reported, as well known. But it is doubtful whether these formulas can be rightly applied to the Japanese. Up till now, there are only a few studies published on this problem. So, in order to determine the standard of the normal Q-T interval in the Japanese, the author has statistically investigated the standard limblead electrocardiograms in 356 instances of adult Japanese (203 men, 153 women ; the ages ranged from 15 to 45 years). The results are as follows : (1) According to "Chain-doublets Theory (Maekawa)" the electrical discharge due to contraction of the heart muscle continues just in the Q-T interval. Therefore, from the standpoint of the law of the heart (Starling), the Q-T interval must be in close relation to the preceding T-Q interval (the duration of the ventricular relaxation). This relationship can be expressed by the following equation, Q-T=15.7(T-Q)^<0.22>…(A) for males Q-T=15.56(T-Q)^<0.22> for females Q-T=14.74(T-Q)^<0.24> (Unit 1/100sec.)(2) The rejection limit of the Q-T interval in the above (A) equation can be given as follows, at the level of significance 5%, (Table I) (y_0-0.2198x_0-1.1963)^2=0.0018+0.0006(x_0-1.6460)^2 where x_0=log T-Q y_0=log Q-T(3)In the same way, the relation of the Q-T interval to the cycle length (R-R interval) can be expressed as follows, Q-T=6.24(R-R)^<0.40>…(B) for males Q-T=5.92(R-R)^<0.41> for females Q-T=6.05(R-R)^<0.41> (Unit 1/100sec.)(4) The rejection limit of the Q-T interval in the above (B) equation can be given as follows, at the level of significance 5%, (Fig. 2) (y_0-0.4004x_0-0.7946)^2=0.0012+0.0009(x_0-1.9069)^2 where x_0=log R-R y_0=log Q-T(5) A comparison was made of the abovementioned equation with the formula proposed by Hegglin and Holzmann or by Fridericia. These formulas deviate from each other as shown in Fig. 2. Consequently, the Q-T interval in a Japanese should be evaluated with the standard in the Japanese.
- 1956-05-20
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