Bardou A, Levy B, Birkui P J, Tedgui A, Bazire J M, Saumont R
Eur J Appl Physiol Occup Physiol. 1981;46(4):387-95. doi: 10.1007/BF00422126.
This study was performed to determine the relationship between variations of arterial cross-section and cardiac period. Relative section variations were recorded by impedance rheography. In 176 anesthetized adult mongrel dogs, aortic and femoral rheograms, femoral pressure, and ECG were recorded. The cardiac period (Tc) and the interval between the systolic and the dicrotic wave, i.e., the arterial intrinsic period (Ta), were measured and related to each other (Tc/Ta ratio). In 125 dogs, the dicrotic wave appeared spontaneously. In these cases Tc/Ta 1.98 +/- 0.16. In 51 dogs, no dicrotic wave appeared spontaneously. Lengthening of cardiac period was obtained in 25 of these dogs by vagus stimulation. As related to the cardiac period before vagal stimulation Tc/Ta was then 0.98 +/- 0.08. In the remaining 26 dogs, such a lengthening was obtained by inducing a premature ventricular depolarization. In this group, Tc/Ta was 1.00 +/- 0.03. The results of the present study suggest that a constant adaptation exists between ventricular ejection and arterial dynamics. The physiologic implications are discussed.
本研究旨在确定动脉横截面变化与心动周期之间的关系。通过阻抗血流图记录相对截面变化。在176只麻醉的成年杂种狗中，记录主动脉和股动脉血流图、股动脉压力和心电图。测量心动周期（Tc）以及收缩波与重搏波之间的间隔，即动脉固有周期（Ta），并将它们相互关联（Tc/Ta比值）。在125只狗中，重搏波自发出现。在这些情况下，Tc/Ta为1.98±0.16。在51只狗中，未自发出现重搏波。其中25只狗通过迷走神经刺激使心动周期延长。与迷走神经刺激前的心动周期相关，此时Tc/Ta为0.98±0.08。在其余26只狗中，通过诱发室性早搏使心动周期延长。在该组中，Tc/Ta为1.00±0.03。本研究结果表明，心室射血与动脉动力学之间存在持续的适应性。对其生理意义进行了讨论。
