(A) Fc to acetyl-CoA with systemic infusion (S), including large unlabeled endogenous contribution. (B) Fc to acetyl-CoA with intracoronary infusion (IC). In comparison with S, Fc of [2,4,6,8-13C4]octanoate markedly increased with CON and ECMO. In both the systemic and intracoronary infusion groups, LCFA oxidation significantly increased with ECMO when compared to CON. White, Fc of unlabeled endogenous substrates; dark gray, Fc of [2-13C]lactate; light gray, Fc of [2,4,6,8-13C4]octanoate; black, Fc of [U-13C]LFCAs. (C) Anaplerotic component relative to CAC flux. Values are means ± SE; n = 5-6 per group. *: P < 0.05, †: P < 0.01 vs CON, ‡: P < 0.01 vs S.