PhenylephrineAdrenergic alpha-AgonistsAdrenergic alpha-1 Receptor AgonistsVasoconstrictor AgentsReceptors, Adrenergic, alpha-1Receptors, Adrenergic, alphaEphedrinePrazosinVasoconstrictionAdrenergic alpha-AntagonistsMydriaticsSympathomimeticsAorta, ThoracicAdrenergic alpha-1 Receptor AntagonistsBaroreflexAdrenergic AgonistsBlood PressureIsoproterenolNitroprussideNorepinephrineClonidineVasodilator AgentsReceptors, AdrenergicTropicamideMuscle, Smooth, VascularDose-Response Relationship, DrugMuscle ContractionMethoxamineMesenteric ArteriesVasodilationAnesthesia, ObstetricalPressoreceptorsPropranololRats, Sprague-DawleyHeart RatePotassium ChlorideAnesthesia, SpinalPhentolamineRats, WistarHypotensionEpinephrineSympathetic Nervous SystemAcetylcholineYohimbineDioxanesNitric OxideMuscle RelaxationRats, Inbred StrainsArteriesAortaAdrenergic beta-AgonistsEndothelium, VascularCalciumNG-Nitroarginine Methyl EsterRabbitsVasopressinsTailPupilPhenoxybenzamineEnzyme InhibitorsOxymetazolineRegional Blood FlowStimulation, ChemicalAngiotensin IINitric Oxide SynthasePenisDogsTime FactorsHeartHemodynamicsVascular ResistanceMetaproterenolQuinoxalinesReceptors, Adrenergic, alpha-2CardiomegalyMyographyNitroarginineCardiotonic AgentsMuscle, SmoothMuscle TonusReceptors, Adrenergic, betaAdrenergic alpha-2 Receptor AgonistsMyocardiumCesarean SectionEndothelin-1RitodrineGanglionectomyAdrenergic beta-AntagonistsPerfusionMyocardial ContractionErgonovineIndomethacinCatecholaminesMethylene BluePrognosisGanglionic BlockersPhosphorylase aTreatment OutcomeTrimethaphan15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid