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European Journal of Echocardiography Advance Access published online on November 28, 2009
European Journal of Echocardiography, doi:10.1093/ejechocard/jep194
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Published on behalf of the European Society of Cardiology. All rights reserved. © The Author 2009. For permissions please email: journals.permissions@oxfordjournals.org

Segmental and global longitudinal strain and strain rate based on echocardiography of 1266 healthy individuals: the HUNT study in Norway

Havard Dalen1,2,*, Anders Thorstensen1, Svein A. Aase1, Charlotte B. Ingul1, Hans Torp1, Lars J. Vatten3 and Asbjorn Stoylen1,4

1 Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway
2 Department of Medicine, Levanger Hospital, Nord-Trøndelag Health Trust, Levanger, Norway
3 Department of Public Health, Norwegian University of Science and Technology, Trondheim, Norway
4 Department of Cardiology, St Olavs Hospital/Trondheim University Hospital, Trondheim, Norway

Received 21 September 2009; accepted after revision 4 November 2009.

* Corresponding author. Tel: +47 95871716, Email: havard.dalen{at}ntnu.no


  Abstract

Aims: To study the distribution of longitudinal systolic strain and strain rate (SR) as indicators of myocardial deformation according to age and sex in a healthy population.

Methods and results: Longitudinal strain and SR were determined in 1266 healthy individuals from three standard apical views, using a combination of speckle tracking (ST) and tissue Doppler imaging (TDI) to track regions of interest (ROIs). To test applicability of the reference values, we used a subset of the population to compare four methods of assessing myocardial deformation: (1) a combination of TDI and ST; (2) TDI with fixed ROIs; (3) TDI with tracking of ROIs; and (4) ST. Mean (SD) overall global longitudinal strain and SR were –17.4% (2.3) and –1.05 s–1 (0.13) in women, and –15.9% (2.3) and –1.01 s–1 (0.13) in men. Deformation indices decreased with increasing age. The combined and ST methods showed identical SR, but values were significantly lower than those obtained by TDI. Strain was overestimated by the ST method (18.4%) compared with the combined method (17.4%).

Conclusion: The reference values for global and segmental longitudinal strain and SR obtained from this population study are applicable for use in a wide clinical setting.

Keywords: Myocardial deformation; Systolic heart failure; Population study; Reference values; Tissue Doppler; Speckle tracking


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