The Assessment of Left Ventricular Time-Varying Radius Using Tissue Doppler Imaging

authors:

avatar fardin Mirbolouk 1 , avatar Hassan Moladoust 1 , * , avatar Vahid Nikseresht 1 , avatar Bijan Shad 1 , avatar Zahra Ojaghi-Haghighi 2 , avatar Mohammad Assadian Rad 1

Guilan University of Medical Sciences, Heshmat Cardiovascular Research Center, Rasht, Guilan, Iran
Department of Echocardiography, Shaheed Rajaei Cardiovascular Medical and Research Center, Tehran University of Medical Sciences, Tehran, Iran
International Cardiovascular Research Journal: Vol.6, issue 1; e12843
published online: September 30, 2012
article type: Research Article
received: May 17, 2017
accepted: February 07, 2012

how to cite: Mirbolouk F, Moladoust H, Nikseresht V , Shad B , Ojaghi-Haghighi Z , et al. The Assessment of Left Ventricular Time-Varying Radius Using Tissue Doppler Imaging. Int Cardiovasc Res J. 2012;6(1):e12843. 

Abstract

Background: Left ventricular twist/torsion is believed to be a sensitive indicator of systolic and diastolic performance. To obtain circumferential rotation using tissue Doppler imaging, we need to estimate the time-varying radius of the left ventricle throughout the cardiac cycle to convert the tangential velocity into angular velocity.
Objectives: The aim of this study was to investigate accuracy of measured LV radius using tissue Doppler imaging throughout the cardiac cycle compared to two-dimensional (2D) imaging.
Methods: A total of 35 subjects (47±12 years old) underwent transthoracic echocardiographic standard examinations. Left ventricular radius during complete cardiac cycle measured using tissue Doppler and 2D-imaging at basal and apical short axis levels. For this reason, the 2D-images and velocity-time data derived and transferred to a personal computer for off-line analysis. 2D image frames analyzed via a program written in the MATLAB software. Velocity-time data from anteroseptal at basal level (or anterior wall at apical level) and posterior walls transferred to a spreadsheet Excel program for the radius calculations. Linear correlation and Bland-Altman analysis were calculated to assess the relationships and agreements between the tissue Doppler and 2D-measured radii throughout the cardiac cycle.
Results: There was significant correlation between tissue Doppler and 2D-measured radii and the Pearson correlation coefficients were 0.84 to 0.97 (P<0.05). Bland-Altman analysis by constructing the 95% limits of agreement showed that the good agreements existed between the two methods.
Conclusion: It can be concluded from our experience that the tissue Doppler imaging can reasonably estimate radius of the left ventricle throughout the cardiac cycle.

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References

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