Japanese Journal of Veterinary Research;Volume 2, Number 4

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STATISTICAL STUDY ON THE FLUCTUATION OF R-R INTERVALS IN ELECTROCARDIOGRAM

KUSACHI, Ryosaku

Permalink : http://hdl.handle.net/2115/1664
JaLCDOI : 10.14943/jjvr.2.4.169

Abstract

To study on the fluctuation of R-R intervals measured sequently in electorocardiogram, the method depending on autocorrelation coefficient was applied. The following results were obtained. 1. The fluctuation of R-R intervals caused by respiration can be qualitatively investigated by this method and classified in type of damped motion, of beat and uniform type whose period can be decided in adult. 2. In the fluctuation of R-R intervals, it is found that the large period which is 8.56〜20.72 seconds in adult during breathing and during suspending respiration, 4.45 seconds in rabbit and 14.25 seconds in dog anesthetized with molphine is present. 3. The large period disappears after the vagi are cut at neck in dog. 4. It may be concluded that the large period is governed by agency of vagus, generated by some parts of diencephalon, probably in the neighbourhood of the third ventricle. 5. It may be also decided that some parts of diencephalon adjusting cardial rhythm are regulated by the respiratory center or by the peripheral impulse which is caused by motion of respiration in normal state.

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