KMID : 0368120120420090618
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Korean Circulation Journal 2012 Volume.42 No. 9 p.618 ~ p.624
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Relation Between RR Intervals and Early Diastolic Mitral Annular Velocities in Atrial Fibrillation
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Kim Eun-Young
Choi Young-Hwan Hyeon Cheol-Won Cho Jun-Hwan Kim Kyung-Joon Lee Wang-Soo Lee Kwang-Je Kim Sang-Wook Kim Tae-Ho Kim Chee-Jeong
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Abstract
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Background and Objectives : Irregular RR intervals in atrial fibrillation (AF) make beat-to-beat changes in left ventricular (LV) systolic performance. Early diastolic mitral annular velocity (E¡¯) is one of the well-established parameters for evaluating LV diastolic function. The relation between RR intervals and E¡¯s is unknown. The aim of this study was to observe the influence of continuous changes in RR interval on the parameter for diastolic function in AF.
Subjects and Methods: Echocardiography was performed in 117 patients with AF. E¡¯ was adjusted for the effect of pre-preceding RR interval (RR-2) using the logarithmic equation between RR-2 and E¡¯. The logarithmic equation between adjusted E¡¯ and preceding RR interval (RR-1) was calculated.
Results: The slope in the relation between RR-1 and E¡¯ varied from -2.5 to 2.6. The slope was lower (more likely negative) in patients with higher ratio of early diastolic mitral flow velocity (E) to E¡¯ (r=-0.21, p=0.023), ischemic heart disease (IHD, r=0.21, p=0.026), and higher systolic blood pressure (r=-0.19, p=0.046). When patients were divided into these 3 groups on the basis of slope, the lowest slope group (<-0.55, n=39) was associated with higher E¡¯/E (p=0.004) and IHD (p=0.018) compared with the highest slope group (>0.57, n=39). The slope with regards to the relationship between RR-2 and E¡¯ also varied from -3.4 to 3.1.
Conclusion: Changes in RR intervals had variable effects on E¡¯s according to clinical variables in AF.
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KEYWORD
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Ventricular function, left, Atrial fibrillation, Electrocardiography, Pulsed Doppler echocardiography, Heart rate
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