PMID: 9159649Feb 1, 1997Paper

Pressure-interval relationship characterizes left ventricular irregular beat contractilities and their mean level during atrial fibrillation

The Japanese Journal of Physiology
Hiroki YamaguchiH Suga

Abstract

How left ventricular (LV) contractility relates to irregular RR intervals during atrial fibrillation (AF) is still unclear. We investigated the relationship between the LV contractility (Emax) of individual beats and their preceding RR intervals during AF in isovolumic contractions is excised cross-circulated canine hearts, and additionally in ejecting contractions in in situ canine hearts. Atrial high-frequency electrical stimulation induced AF. We recorded a LV electrocardiogram, volume and pressure, and calculated the Emax of every arrhythmic beat. Multiple linear regression analysis between Emax and the six preceding RR intervals of all arrhythmic beats during 1 min AF showed the preceding RR interval (RR1) and the pre-preceding interval (RR2) to be the predominant predictors of Emax. The Emax-RR1/RR2 scattergram was closely fitted by a linear regression line. We found Emax at RR1/RR2 = 1 on the regression line to be virtually identical with both mean Emax during AF and stable Emax obtained during irregular atrial pacing at the same intervals as the mean RR interval during AF. These results newly indicate that the pressure-interval relationship predominantly characterizes LV irregular beat contractilities and their mean lev...Continue Reading

Citations

Jul 2, 2003·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Toshiaki SumidaShigefumi Morioka
Nov 11, 2003·The Japanese Journal of Physiology·Juichiro ShimizuHiroyuki Suga
May 19, 2005·The Japanese Journal of Physiology·Juichiro ShimizuHiroyuki Suga
Sep 1, 2012·Journal of Echocardiography·Kazuto YamaguchiKazuaki Tanabe
Nov 14, 2006·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Kaoru Yamanaka-FunabikiTakeshi Nakano
Sep 13, 2005·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Chun-Li WangChi-Tai Kuo
Jul 15, 2006·The Journal of Physiological Sciences : JPS·Juichiro ShimizuHiroyuki Suga
Mar 25, 2016·Circulation. Arrhythmia and Electrophysiology·Francisco ContijochYuchi Han
Nov 20, 2004·American Journal of Physiology. Heart and Circulatory Physiology·Satoshi MohriHiroyuki Suga
Oct 27, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Raghuram ChavaAravindan Kolandaivelu
Oct 22, 2002·American Journal of Physiology. Heart and Circulatory Physiology·Zoran B PopovićTodor N Mazgalev
Jul 17, 2001·American Journal of Physiology. Heart and Circulatory Physiology·T TabataJ D Thomas

❮ Previous
Next ❯

Related Concepts

Related Feeds

Atrial Fibrillation

Atrial fibrillation is a common arrhythmia that is associated with substantial morbidity and mortality, particularly due to stroke and thromboembolism. Here is the latest research.

Atrial Filbrillation

Atrial fibrillation refers to the abnormal heart rhythm characterized by rapid and irregular beating of the atria. Here is the latest research.

Arrhythmia

Arrhythmias are abnormalities in heart rhythms, which can be either too fast or too slow. They can result from abnormalities of the initiation of an impulse or impulse conduction or a combination of both. Here is the latest research on arrhythmias.