European Journal of Echocardiography Advance Access originally published online on April 9, 2009
European Journal of Echocardiography 2009 10(5):683-690; doi:10.1093/ejechocard/jep038
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Echocardiographic assessment of left ventricular untwist rate: comparison of tissue Doppler and speckle tracking methodologies
1 Cardiovascular Imaging and Dynamics, Department of Cardiovascular Diseases, Catholic University Leuven, Leuven, Belgium
2 Experimental Cardiology, Department of Cardiovascular Diseases, Catholic University Leuven, Leuven, Belgium
3 Anaesthesiology and Algology, Department of Acute Medical Sciences, Catholic University Leuven, Leuven, Belgium
Received 16 October 2009; accepted after revision 22 March 2009; online publish-ahead-of-print 9 April 2009.
* Corresponding author: Medical Imaging Research Center, U. Z. Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium. Tel: +32 16 34 90 73; fax: +32 16 34 34 67. E-mail address: vesselina.ferferieva{at}uz.kuleuven.be
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Abstract |
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Aims: The study was designed to test the influence of the temporal resolution, at which tissue Doppler imaging (TDI) and speckle tracking imaging (STI) operate, on the accurate assessment of left ventricular (LV) untwist rate (UR).
Methods and results: Echo imaging and invasive LV pressure measurements were performed during right atrial (RA) pacing and dobutamine challenge in eight pigs. LV torsion and torsional rate profiles were analysed from grey scale and tissue Doppler data (apical and basal short axis) at frame rates of 82 ± 17 and 183 ± 14 Hz, respectively. Temporal subsampling of TDI data sets was performed at 82 ± 6 Hz in order to mimic the mean temporal resolution of STI and the LV torsional curves were again extracted. At rest, LV UR values were comparable for both imaging techniques. However, during dobutamine stimulation, TDI estimated peak UR was predominantly higher than UR measured by STI (–112.1 ± 64.5°/s vs. –75.5 ± 31.4°/s, P < 0.05). The similarity of LV UR measurements with respect to the STI/TDI data was examined by a Bland–Altman analysis.
Conclusion: Although both methods regarding LV UR correlated well, these methods cannot be interchanged. STI showed a bias to underestimate UR at high values.
Keywords: Diastole; Echocardiography; Haemodynamics; Untwist; Torsion
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