title: Methylxanthines in cardiac contractility.
mesh_terms: D006321:Heart / Q000187:drug effects* / Q000502:physiology; D008433:Mathematics; D008954:Models, Biological; D009119:Muscle Contraction / Q000187:drug effects*; D014970:Xanthines / Q000494:pharmacology*
chemical_list: D014970:Xanthines