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Heart rate variability in atrial fibrillation related to left atrial size.

Publication ,  Journal Article
Friedman, HS
Published in: The American journal of cardiology
March 2004

The purpose of this investigation was to determine whether heart rate variability (HRV) in atrial fibrillation (AF) can be related to any echocardiographic-derived measurements of cardiac dimensions or function. AF is characterized by marked HRV. Although HRV in normal sinus rhythm has been studied and shown to have important clinical implications, there have been relatively few published reports dealing with the phenomenon in AF. This study examines HRV in AF taking into account the influence of heart rate. HRV measurements were obtained in 38 patients with persistent AF who had undergone 24-hour ambulatory electrocardiographic monitoring. Taking into account a strong heart rate dependence of the HRV measurements, regressions were calculated. The relations were then re-examined using the differences (diff) in HRV from the expected for the average RR intervals. No significant correlations were found between unadjusted HRV measurements and any clinical features or echocardiographic variables. However, taking into account heart rate relations, with negative HRVdiff signifying less HRV than expected, reduced HRV correlated with increasing left atrial and left ventricular dimensions. On multivariate regression analysis, left atrial dimension emerged as an independent determinant of HRV. Also, HRV was greater in patients with lone AF than in those with cardiac disorders. HRV in AF is highly rate dependent. Unless this influence is taken into account, important relations may be obscured. When HRVdiff are related to echocardiographic measurements, increasing left atrial dimensions correlate with less HRV.

Duke Scholars

Published In

The American journal of cardiology

ISSN

0002-9149

Publication Date

March 2004

Volume

93

Issue

6

Start / End Page

705 / 709

Location

united states

Related Subject Headings

  • Cardiovascular System & Hematology
  • 1102 Cardiorespiratory Medicine and Haematology
 

Citation

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ICMJE
MLA
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Friedman, H. S. (2004). Heart rate variability in atrial fibrillation related to left atrial size. The American Journal of Cardiology, 93(6), 705–709.
Friedman, H. S. “Heart rate variability in atrial fibrillation related to left atrial size.The American Journal of Cardiology 93, no. 6 (March 2004): 705–9.
Friedman HS. Heart rate variability in atrial fibrillation related to left atrial size. The American journal of cardiology. 2004 Mar;93(6):705–9.
Friedman, H. S. “Heart rate variability in atrial fibrillation related to left atrial size.The American Journal of Cardiology, vol. 93, no. 6, Mar. 2004, pp. 705–09.
Friedman HS. Heart rate variability in atrial fibrillation related to left atrial size. The American journal of cardiology. 2004 Mar;93(6):705–709.
Journal cover image

Published In

The American journal of cardiology

ISSN

0002-9149

Publication Date

March 2004

Volume

93

Issue

6

Start / End Page

705 / 709

Location

united states

Related Subject Headings

  • Cardiovascular System & Hematology
  • 1102 Cardiorespiratory Medicine and Haematology