Coronary CirculationRegional Blood FlowBlood Flow VelocityCoronary VesselsDogsCoronary AngiographyCoronary Artery DiseaseHemodynamicsVascular ResistanceAdenosineCoronary DiseaseVasodilationCoronary StenosisBlood PressureHyperemiaAngioplasty, Balloon, CoronaryVasodilator AgentsOxygen ConsumptionCerebrovascular CirculationHeartMyocardiumLaser-Doppler FlowmetryPapaverineHeart RateMicrocirculationMicrospheresCoronary Artery BypassMyocardial IschemiaNitroglycerinMyocardial ContractionSwineNitric OxideTime FactorsKryptonBretylium TosylateMyocardial InfarctionVasoconstrictionEndothelium, VascularAcetylcholineCollateral CirculationOxygenCoronary VasospasmFlow CytometryVasomotor SystemPerfusionCoronary ThrombosisPropranololUltrasonography, DopplerModels, CardiovascularDipyridamoleEchocardiographyPhysical ExertionPulsatile FlowElectrocardiographyDiastoleVentricular Function, LeftArteriesPurinergic P1 Receptor AntagonistsTheophyllineCardiac CatheterizationBlood VolumeXenon RadioisotopesNG-Nitroarginine Methyl EsterAnesthesiaMyocardial Stunningomega-N-MethylarginineMyocardial ReperfusionCoronary AneurysmEchocardiography, DopplerIsofluraneDose-Response Relationship, DrugGlyburideCarbon DioxideInfusions, Intra-ArterialInfusions, IntralesionalMicrovascular AnginaRadioisotopesNitroarginineTomography, Emission-Computed, Single-PhotonTomography, Emission-ComputedCardiac OutputInjections, Intra-ArterialAminophyllineBradykininNitric Oxide SynthaseReflexThalliumLactatesPartial PressureUltrasonography, InterventionalVeinsProspective StudiesTreatment OutcomeAdrenergic beta-AntagonistsMyocardial BridgingNitroprussideVeratrineArteriolesEnzyme InhibitorsStents