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Figure 1. GE AFI software to calculate segmental and Global Longitudinal Strain (GLS). Normal example
Figure 1. GE AFI software to calculate segmental and Global Longitudinal Strain (GLS). Normal example

Figure 1. The AFI algorithm calculates the % strain negative value (the small colored squares mark the maximum segmental contraction) between the ECG R wave (light blue arrow) and end-ejection (green dotted line). In each view, six wall segment lines are analysed (total= 18 segments), whereas the bull’s eye graph show a LV 17-segment model averaging apical segments and extrapolating the true apex. In this normal example all segmental longitudinal strain curves peak at end-ejection.
AVC= aortic valve closure; FR; frame rate; HR; heart rate; GLPS_Avg: Average calculated Global Longitudinal Peak Strain (systolic).

Figure 2. AFI normal longitudinal segmental strain values (data from the Author)

Normal regional values:

Base segments= – 18.9 ± 2.4 %
Mid (papillary) segments= -21.3 ± 2.2 %
Apical segments= – 24.3 ± 2.2 %

Population sample from:
Barbier P. Eur Heart J Cardiovasc Imaging 2015

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