PressureBlood PressureRespiratory Protective DevicesAir PressureDoppler EffectAir FiltersModels, CardiovascularBlood Flow VelocityWork of BreathingHemodynamicsFiltrationBlood ViscosityEquipment DesignVascular ResistanceCardiac CatheterizationHydrostatic PressureRheologyHyperemiaPulsatile FlowCoronary StenosisRegional Blood FlowUltrasonographyBlood Pressure DeterminationCoronary CirculationIntraocular PressureTransducers, PressureHypertensionIntracranial PressureHeartModels, TheoreticalModels, BiologicalBlood Pressure Monitoring, AmbulatoryAtmospheric PressureOphthalmic SolutionsVenous PressureArterial PressureVentricular PressureHeart RateCentral Venous PressureAntihypertensive AgentsPulmonary Wedge PressureOsmotic PressureTime FactorsSystolePulseDiastoleDogsManometryCerebrospinal Fluid PressurePositive-Pressure RespirationCardiac OutputHypotensionContinuous Positive Airway PressurePortal PressureSympathetic Nervous SystemProspective StudiesReninPressoreceptorsOxygenRats, Inbred SHRKidneyPhenylmercury CompoundsPostureLower Body Negative PressureRats, Sprague-DawleyAnalysis of VarianceRespirationBaroreflexTreatment OutcomeRespiratory MechanicsArteriesTonometry, OcularComplianceCarbon DioxideHydrocephalus, Normal PressureCircadian RhythmMonitoring, PhysiologicFollow-Up StudiesPreservatives, PharmaceuticalAortaDisease Models, AnimalCardiovascular SystemDose-Response Relationship, DrugReflexReference ValuesNorepinephrineGlaucomaAdministration, TopicalDouble-Blind MethodSphygmomanometersPerfusionPulmonary ArteryTidal VolumeAngiotensin IIVentricular Function, LeftBody WeightHypertension, RenalRats, WistarRats, Inbred WKYVasoconstriction