Effect of ARNI and ivabradine on left ventricular ejection fraction (LVEF) (A), left ventricular fractional shortening (LVFS) (B), the ratio of the diastolic transmitral peak early and late filling velocities (E/A ratio) (C), and the ratio of the diastolic transmitral peak early filling velocity and the maximal velocity of early diastolic wall movement wave at the level of mitral annulus (E/Em ratio) (D) in SHRs after six weeks of treatment. ARNI, sacubitril/valsartan; C, Wistar controls; IVA, ivabradine; SHRs, spontaneously hypertensive rats. Results are presented as means ± SEM. n = 7 per group. One-way, two-tailed ANOVA followed by multiple comparisons with a Bonferroni post-hoc test; * p < 0.05 vs. C; # p < 0.05 vs. SHR.