AdenosineAdenosine TriphosphatePerfusionReceptor, Adenosine A2AReceptor, Adenosine A1Adenosine DeaminaseReceptor, Adenosine A3Perfusion ImagingAdenosine KinaseReceptor, Adenosine A2BAdenosine MonophosphateReceptors, Adenosine A2Adenine NucleotidesAdenosine A2 Receptor AgonistsReceptors, Purinergic P1Adenosine A2 Receptor AntagonistsAdenosine A1 Receptor AntagonistsMyocardial Perfusion ImagingGuanosine TriphosphateAdenosine A1 Receptor AgonistsPurinergic P1 Receptor AntagonistsReceptors, PurinergicAdenosine TriphosphatasesXanthinesPurinergic P1 Receptor AgonistsAdenosine DiphosphateTheophyllineApyraseKineticsPhosphatesCoronary CirculationMagnesiumNucleotidesPhosphocreatineUridine TriphosphateAdenosine-5'-(N-ethylcarboxamide)CalciumReceptors, Purinergic P25'-NucleotidasePhosphorus IsotopesDipyridamoleInosineCyclic AMPMyocardiumEnergy MetabolismAdenosine A3 Receptor AntagonistsTomography, Emission-Computed, Single-PhotonTime FactorsRabbitsHeartCoformycinAdenosine A3 Receptor Agonists2-ChloroadenosineHydrogen-Ion ConcentrationDose-Response Relationship, DrugThiamine TriphosphateDogsPhenethylaminesInosine NucleotidesLactatesOxidative PhosphorylationGuanosine 5'-O-(3-Thiotriphosphate)AdeninePhenylisopropyladenosineRats, Sprague-DawleyChemotherapy, Cancer, Regional PerfusionOxygen ConsumptionNucleosidesUracil NucleotidesRegional Blood FlowCells, CulturedVasodilator AgentsCerebrovascular CirculationDinitrophenolsReceptors, Purinergic P2XHydrolysisPotassiumMagnetic Resonance SpectroscopyDiphosphatesHypoxanthinesPurinesInosine TriphosphatePurinergic AntagonistsAdenylyl ImidodiphosphateGlucoseRibonucleosidesGuinea PigsPyruvatesGlycolysisRats, Inbred StrainsThionucleotidesCytidine TriphosphateRats, WistarBrainReceptors, Purinergic P2Y2Deoxyadenine NucleotidesCytosine NucleotidesReceptors, Purinergic P2X7ErythrocytesCarbon Isotopes