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. 2014 Jul 11;18(4):R149. doi: 10.1186/cc13987

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Copyright © 2014 Orde et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Longitudinal strain and strain rate curves. (a) Representative recording for apical four-chamber longitudinal strain and strain rate curves for a patient with normal left ventricle (LV) systolic function. Echo image displayed in Mayo format: left, LV; right, right ventricle (RV). Negative strain values indicate tissue contraction. Strain rate determined by change in strain over time. (b) Representative recording for apical four-chamber RV longitudinal strain and strain rate curves for a patient with abnormal RV systolic function. Echo image displayed in Mayo format: left, LV; right, RV. RV free wall longitudinal strain determined by the average of base, mid and apical free wall segments.