HypotensionHypotension, ControlledHypotension, OrthostaticBlood PressureIntracranial HypotensionLeadBlood GlucoseBlood Glucose Self-MonitoringHypertensionRegional Blood FlowHemodynamicsCerebrovascular CirculationDogsTime FactorsPost-Exercise HypotensionCohort StudiesTrimethaphanRisk FactorsProspective StudiesBradycardiaDiabetes Mellitus, Type 1Severity of Illness IndexKidneyHeart RateEphedrinePregnancyBody WeightPredictive Value of TestsAnesthesia, SpinalAnesthesia, ObstetricalCross-Sectional StudiesAutonomic Nervous System DiseasesFollow-Up StudiesBiological MarkersGlucoseShockAnesthesiaShock, SepticMidodrineVascular ResistanceNitroprussideOcular HypotensionCardiac OutputHypovolemiaFerricyanidesSyncopeShy-Drager SyndromePure Autonomic FailureBlood Patch, EpiduralPostureIntraoperative ComplicationsSubdural EffusionTilt-Table TestIntracranial PressureVasoconstrictor AgentsShock, HemorrhagicCardiovascular SystemFluid TherapyHemorrhageSympathetic Nervous SystemBlood VolumeCesarean SectionMethyldopaAnesthesia, EpiduralAutonomic Nervous SystemReceptors, ProgesteroneBionicsIsotonic SolutionsPressoreceptorsPhenylephrineDose-Response Relationship, DrugNorepinephrineAntihypertensive AgentsBaroreflexInfusions, IntravenousSplanchnic CirculationMyeloblastinRats, Sprague-DawleyClonidineVasodilationLypressinPlasma SubstitutesTreatment Outcome