Spline curve for all-cause mortality according to change in LV GLS (A) and LARS (B). The curves represent the hazard ratio for all-cause mortality with overlaid 95% confidence intervals across the range of percentage change in LV GLS (A) and LARS (B) at 6 months after CRT implantation, compared with pre-implantation values. CRT, cardiac resynchronization therapy; LARS, left atrial reservoir strain; LV GLS, left ventricular global longitudinal strain.