Renal CirculationBlood PressureNatriuresisRenal ArteryKidneyDogsHomeostasisPressureGlomerular Filtration RateArterial PressureHeart RateHemodynamicsHydrostatic PressureHypertensionBlood Pressure DeterminationVascular ResistanceSympathetic Nervous SystemCardiac OutputBaroreflexPressoreceptorsHypotensionIntracranial PressureRegional Blood FlowCentral Venous PressureTransducers, PressureVenous PressureIntraocular PressureBlood Pressure Monitoring, AmbulatoryAntihypertensive AgentsDenervationRats, Inbred SHRPulmonary Wedge PressureAtmospheric PressureReflexRats, Sprague-DawleyReninCardiovascular SystemAir PressurePhenylephrineVasoconstrictor AgentsPulseTime FactorsNorepinephrineCarotid SinusVentricular PressureBlood Flow VelocityArteriesAngiotensin IIHypertension, PulmonaryConsciousnessPulmonary ArteryGanglionic BlockersVasoconstrictionSystoleBlood VolumeTelemetryShock, HemorrhagicBlood Pressure MonitorsRats, Inbred WKYNitroprussideRespirationVasodilator AgentsSodium Chloride, DietaryHypertension, RenalAnesthesiaVasodilationCardiovascular Physiological PhenomenaOxygenDose-Response Relationship, DrugMedulla OblongataSodium, DietaryBlood Gas AnalysisPulmonary CirculationCerebrovascular CirculationHeartCarbon DioxideRats, WistarAutonomic Nervous SystemLower Body Negative PressureAortaPostureNitric OxideRenin-Angiotensin SystemComplianceSodium ChlorideAnesthesia, GeneralDisease Models, AnimalMonitoring, PhysiologicNG-Nitroarginine Methyl EsterBlood CirculationAnalysis of VariancePulsatile FlowDiastoleLaser-Doppler FlowmetryTrimethaphanAnoxiaOsmotic PressureMonitoring, IntraoperativeManometryHematocrit