Mitochondrial respiration rate (A) and flux control factors (B) in cardiac fibers of the left ventricle after administration of meldonium at a dose of 100 mg/kg for 3 weeks in a model of lipopolysaccharide (LPS)-induced left ventricle dysfunction. LPS induced the inhibition of fatty acid (FA)-dependent oxidative phosphorylation (A,B) and subsequently increased pyruvate metabolism (B). Treatment with meldonium fully restored mitochondrial bioenergetics (A,B) to the level of the normal control group. The results are presented as the mean±SEM of 9 animals. * p < 0.05 vs. the LPS group, one-way ANOVA with Dunnett’s multiple comparison test. Flux control factor, the contribution of each substrate/pathway to the respiration rate; p, pyruvate; S, succinate; F, FA oxidation-dependent pathway; N, NADH pathway; LEAK, substrate-dependent state; OXPHOS, oxidative phosphorylation-dependent state; ROX, residual oxygen consumption.