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. Author manuscript; available in PMC: 2011 May 12.
Published in final edited form as: IEEE Trans Med Imaging. 2009 Aug 25;29(3):625–635. doi: 10.1109/TMI.2009.2030186

Fig. 5.

Fig. 5

EWI of the normal heart under sinus rhythm using incremental strains in the parasternal two-chamber view. LV, ANT, and POST, respectively, denote left ventricle cavity, anterior wall, and posterior wall. Top row: Approximately 12 ms after the onset of the QRS, excitation of the posterior wall endocardium begins. It then propagates both towards the base and the apex. A few milliseconds later, the anterior wall begins to thicken. Middle row: 45 ms after the onset of the QRS, the myocardium is almost completely mechanically activated; thinning of portions of the base are still visible. Bottom row: After the mitral valve closes, an oscillating wave (yellow circle), different in nature from the EMW, is observed. It emanates from the base and travels towards the apex.