Femoral ArteryCoronary VesselsCoronary Vessel AnomaliesCoronary AngiographyInferior Wall Myocardial InfarctionArteriesCoronary CirculationDogsCoronary SinusCoronary StenosisCoronary DiseaseMammary ArteriesCoronary Artery BypassMyocardial InfarctionCoronary OcclusionElectrocardiographyCoronary AneurysmPulmonary ArteryMyocardial IschemiaCollateral Circulation