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Figure 6 Longitudinal deformation of the anterior wall of the left ventricle by 2-dimensional speckle tracking of B-mode ultrasound images (2-dimensional strain). Longitudinal shortening starts during isovolumic contraction period and occurs earlier in the apex as compared with the base. Shortening-lengthening crossover of the basal anteroseptal segment is delayed until the end of isovolumic relaxation. Phase 1, isovolumic contraction; 2, ejection; 3, isovolumic relaxation; 4, early diastole; 5, late diastole. ECG = electrocardiogram.
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