Heidrich L, Freiberg D, Fuhrmann I
Z Gesamte Inn Med. 1984 Feb 1;39(3):46-8.
The duration of the pulse period shows under physiological conditions a though slight variation, which is regarded as the expression of the vegetative regulation of the heart. When this "irregularity" of the duration of the pulse period decreases or increases, it has pathological significance. A calculation algorithm of this parameter called variation of frequency is given. When it is between 2.5 and 10%, i.e. the length of the duration of the pulse period varies by this sum by the mean value, this can be regarded as physiological. At a variation of frequency below 2.5% one speaks of cardiac automatism. It has the same significance as the omission of the vegetative regulation of the heart and thus shows a bad prognosis for the patient. When the variation of frequency is more than 10%, a disturbance of the cardiac rhythm (of various form) is to be derived. At the same time the condition of the criterion of untimeliness can again be formulated. According to this an untimely beginning of beating of the heart (an extrasystole) is existing then, when it begins in an interval of less than 0.9-fold of a normal RR-interval.
在生理条件下，脉搏周期的时长虽有轻微变化，这被视为心脏自主神经调节的表现。当脉搏周期时长的这种“不规则性”减少或增加时，就具有病理意义。给出了一个名为频率变异的该参数的计算算法。当它在2.5%至10%之间时，即脉搏周期时长的长度相对于平均值变化了这个幅度，可视为生理性的。当频率变异低于2.5%时，称为心脏自律性。它与心脏自主神经调节缺失具有相同的意义，因此对患者预后不佳。当频率变异超过10%时，可推断存在心律失常（多种形式）。同时，可再次阐述时机不当标准的情况。据此，当心脏跳动（早搏）在小于正常RR间期0.9倍的间期开始时，就存在心脏跳动开始时机不当的情况。
