Regional Blood FlowBlood Flow VelocityVasodilationArteriolesFlow CytometryDilatation, PathologicDilatationBrachial ArteryPia MaterVasodilator AgentsEndothelium, VascularPulsatile FlowGene FlowCoronary CirculationCerebrovascular CirculationCatheterizationNitric OxideCoronary VesselsVascular ResistanceMicrocirculationPupilBlood PressureAcetylcholineNitroprussideNitroglycerinArteriesRheologyLaser-Doppler FlowmetryLabor Stage, FirstHyperemiaTime FactorsBlood CirculationSwineStress, MechanicalHemorheologyNitroarginineEsophageal AchalasiaVasoconstrictionTropicamideVasomotor SystemBiological FactorsEnzyme InhibitorsIndomethacinOptic FlowNitric Oxide SynthaseNG-Nitroarginine Methyl EsterAdenosineMydriaticsEsophageal StenosisRetinal ArteryGlyburideFlow Injection AnalysisRats, Sprague-DawleyModels, CardiovascularDose-Response Relationship, DrugNitric Oxide Synthase Type IIIPeak Expiratory Flow RateConstriction, PathologicEchocardiographyPressureReflex, PupillaryUltrasonography, DopplerPapaverineBradykininMesenteric ArteriesMontenegroMuscle, Smooth, VascularCyclooxygenase InhibitorsMicrospheresDisease Models, AnimalPerfusionTreatment OutcomeMicroscopy, VideoVasoconstrictor AgentsMuscle, SkeletalRats, WistarCardiomyopathy, DilatedPotassium Channel BlockersPulmonary CirculationOxygenHeart RatePotassium ChannelsPulmonary Valve StenosisReference ValuesAnalysis of VarianceCarotid ArteriesProstaglandinsMyocardiumCollateral CirculationProspective StudiesShear StrengthReproducibility of ResultsUltrasonography, Doppler, ColorOxygen ConsumptionVentricular RemodelingAnoxiaHeartCapillariesFollow-Up StudiesRenal Circulation