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This video clip shows shortening of ventricular length during systole. The figure on the left denotes end diastole and the one on the right depicts end systole. Note the downward descent of the mitral annulus toward the apex in systole. There is a reduction in length by 2 cm, which is a 25% decrease. As there is a decrease in the longitudinal length, it will be denoted by a negative (–) sign; hence the longitudinal strain will be –25% (Movie clip courtesy of Siemens Ultrasound).
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