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Cardiac enzymes such as cytochrome P450 2J2 (CYP2J2) metabolize arachidonic acid (AA) to cardioprotective epoxyeicosatrienoic acids (EETs), which in turn are metabolized by soluble epoxide hydrolase (sEH) to dihydroxyeicosatrienoic acids (DHETs). As EETs and less potent DHETs exhibit cardioprotective and vasoprotective functions, optimum levels of cardiac EETs are paramount in cardiac homeostasis. Previously, we demonstrated that dronedarone, amiodarone and their main metabolites, namely N-desbutyldronedarone (NDBD) and N-desethylamiodarone (NDEA), potently inhibit human cardiac CYP2J2-mediated astemizole metabolism in vitro. In this study, we investigated the inhibition of recombinant human CYP450 enzymes (rhCYP2J2, rhCYP2C8, rhCYP2C9)-mediated AA metabolism and human recombinant sEH (rhsEH)-mediated EET metabolism by dronedarone, amiodarone, NDBD and …