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European Journal of Echocardiography 2004 5(1):18-24; doi:10.1016/S1525-2167(03)00050-7
© 2004 by European Society of Cardiology
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Copyright © 2003, The European Society of Cardiology

Comparison of left atrial size by freehand scanning three-dimensional echocardiography and two-dimensional echocardiography

J Kawaia, K Tanabea,*, C.-L Wanga, T Tania, T Yagia, H Shiotanib and S Moriokaa

aDivision of Cardiology, Kobe General Hospital, 4-6 Minatojima-nakamachi, Chuo-ku, Kobe 650-0046, Japan
bHealth Science, Kobe University Graduate School of Medicine, Kobe, Japan

Received 5 February 2003; received in revised form 26 May 2003; accepted after revision 28 May 2003.

* Corresponding author. Tel.: +81-78-302-4321; fax: +81-78-302-2487. kazuaki_tanabe{at}medical.general.hp.city.kobe.jp


  Abstract

Aims: As the left ventricular (LV) dimension is a poor indicator of LV volume, there are well-known limitations of left atrial (LA) antero-posterior dimensions as indicators of chamber size. LA volume has been shown to provide a more accurate assessment of LA size than LA dimension. To evaluate two-dimensional (2D)-derived LA volume in assessing LA size, we compared LA dimension and 2D LA volume with three-dimensional (3D)-derived LA volume.

Methods: We performed transthoracic freehand scanning 3D echocardiography (3D EchoTech, Germany) using magnetic fields and a harmonic imaging system in 32 patients. We collected a series of LA tomograms by slowly tilting the probe (fan-like scanning) in the parasternal position. The 3D LA volume was calculated by using the multiplanar Simpson's method. The 2D LA volume was measured by using the modified biplane Simpson's rule.

Results: LA antero-posterior dimensions and 2D volumes showed a significant positive correlation with 3D LA volumes. However, the correlation coefficient was significantly greater for the relationship between 2D LA volumes and 3D LA volumes than for that between LA dimensions and 3D LA volume.

Conclusions: The 2D LA volumes provide a more accurate measure of the true size of the LA and are more sensitive to changes in LA size.

Keywords: echocardiography; left atrium; volume


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