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. 2018 Aug 2;84(Suppl 1):30–45. doi: 10.1038/s41390-018-0080-2

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© The Author(s) 2018

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Fig. 5 — Difference in velocity between two points along the long axis of the septum. The curves show tissue velocities by tissue Doppler during the cardiac cycle. The point closer to the base (yellow) has a higher systolic and diastolic velocity when compared with the point closer to the base (green). The difference in velocity is used to calculate strain rate and derive strain of that segment bordered by the two points