Regional systolic strain analysis: Rad deletion improves strain in selected segments. a (Upper panels) representative longitudinal axis view (left) with schematic showing demarcation of segments (right). Abbreviations: BA-S basal anterior-septal, MA-S mid anterior-septal, AA apical anterior, AL apical lateral, MI-L mid inferior-lateral, BI-L basal inferior-lateral. a (Lower panels) representative short axis view (left) with schematic showing demarcation of segments (right). Abbreviations: A anterior, AL anterior lateral, IL inferior lateral, I inferior, IS inferior septal, AS anterior septal. b Longitudinal segmental strain, pooled data. *p < 0.01. c Circumferential segmental strain, pooled data