StrokeStroke VolumeCardiac OutputBlood VolumeHemodynamicsBlood PressureBrain IschemiaHeart RateReproducibility of ResultsTime FactorsCerebrovascular DisordersThermodilutionFluid TherapyCardiography, ImpedanceVentricular Function, LeftProspective StudiesVascular ResistanceMagnetic Resonance ImagingCardiac VolumeHeartBlood Flow VelocityHypovolemiaVentricular Function, RightRisk FactorsHeart VentriclesPlasma VolumeTreatment OutcomeCardiovascular Physiological PhenomenaMyocardial ContractionOxygen ConsumptionMonitoring, PhysiologicEchocardiography, DopplerCerebral HemorrhageObserver VariationCentral Venous PressureCerebral InfarctionSystoleFollow-Up StudiesBlood Volume DeterminationDogsVentricular FunctionLung Volume MeasurementsPredictive Value of TestsHeart Function TestsSupine PositionEchocardiographyMonitoring, IntraoperativeSensitivity and SpecificityPhysical ExertionIschemic Attack, TransientDiastoleHead-Down TiltExercise TestSeverity of Illness IndexTomography, X-Ray ComputedPostureRespirationReference ValuesCerebral AqueductImage Processing, Computer-AssistedBrainPulmonary Wedge PressurePulseAcute DiseaseLower Body Negative PressureExerciseEchocardiography, Three-DimensionalRegional Blood FlowCohort StudiesRecovery of FunctionAnalysis of VarianceImaging, Three-DimensionalPressureCardiovascular DeconditioningCatheterization, Swan-GanzCineangiographyOxygenRetrospective StudiesMagnetic Resonance Imaging, CineHypertensionComplianceHeart FailureBed RestRegression AnalysisCerebrovascular CirculationCardiac CatheterizationModels, CardiovascularAlgorithmsParesisFibrinolytic AgentsPlasma SubstitutesAge FactorsOrgan SizeBrain InfarctionStroke, LacunarCase-Control StudiesTissue Plasminogen ActivatorPulmonary CirculationFluid ShiftsEchocardiography, Transesophageal