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Absolute and relative duration of ventricular systolic phases

  • Physiology
  • Published:
Bulletin of Experimental Biology and Medicine Aims and scope

Summary

The duration of the isometric contraction and of the ejection of blood from the ventricles may depend on heart rate. The dependence of isometric contraction (tt) and blood ejection (te) can be expressed by the formulas:

$$\begin{gathered} t_e = 0.244 \cdot \sqrt C and t_e = 0.137 \cdot C + 0.106 \hfill \\ t_t = 0.081 \cdot \sqrt C and t_t = 0.046 \cdot C + 0.035 \hfill \\ \end{gathered} $$

The idea of an intrasystolic index is adopted: it is the relation between the duration of the ejection phase and the duration of ventricular systole. This index estimates the efficiency of heart contraction. The relative length of the ejection phase (intrasystolic index) and that of the isometric contraction phase are practically independent of heart rate. length of the ejection phase (intrasystolic index) and that of the isometric contraction phase are practically independent of heart rate.

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Authors and Affiliations

  1. Laboratory of Circulatory and Respiratory Physiology of the Institute of Chest Surgery, Academy of Medical Sciences of the USSR, Moscow

    V. L. Karpman

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  1. V. L. Karpman
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Karpman, V.L. Absolute and relative duration of ventricular systolic phases. Bull Exp Biol Med 43, 526–529 (1957). https://doi.org/10.1007/BF00785730

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  • DOI: https://doi.org/10.1007/BF00785730

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