PhenylephrineVasoconstrictor AgentsEphedrineAdrenergic alpha-AgonistsHypotensionAdrenergic alpha-1 Receptor AgonistsVasopressinsRitodrineAnesthesia, ObstetricalBlood PressureShock, SepticReceptors, Adrenergic, alpha-1Anesthesia, SpinalVasoconstrictionNorepinephrineMephenterminePrazosinDecerebrate StateAdrenergic alpha-AntagonistsReceptors, Adrenergic, alphaArginine VasopressinEpinephrineHemodynamicsHeart RateCritical CareShockDose-Response Relationship, DrugPropranololVascular ResistanceAngiotensin IISympathetic Nervous SystemVasomotor SystemMydriaticsCesarean SectionSympathomimeticsRats, Inbred StrainsAorta, ThoracicAdrenergic alpha-1 Receptor AntagonistsAutonomic Fibers, PostganglionicRats, WistarCardiotonic AgentsBaroreflexAdrenergic AgonistsEtomidateHeart ArrestCatecholaminesCardiac OutputIsoproterenolNitroprussideRats, Sprague-DawleyCardiopulmonary ResuscitationResuscitationClonidineReceptors, AdrenergicLypressinVasodilator AgentsTropicamideMuscle, Smooth, VascularRegional Blood FlowAcidosisNitric OxideAdrenal InsufficiencyCritical IllnessMuscle ContractionDogsMethoxamineMesenteric ArteriesFluid TherapyVasodilationReceptors, VasopressinPressoreceptorsInfusions, IntravenousPerfusionHypertensionPotassium ChlorideIntracranial PressurePhentolamineAnesthetics, IntravenousProspective StudiesAcid-Base EquilibriumAcetylcholineYohimbinePressure UlcerFentanylDioxanesSaralasinIntensive Care UnitsMuscle RelaxationSepsisHydrochloric AcidAortaElectric StimulationRetrospective StudiesReceptors, AngiotensinAdrenergic beta-AgonistsArteriesTime FactorsTreatment OutcomeEndothelium, VascularCalcium