Blood VolumePlasma VolumeHypovolemiaErythrocyte VolumeCerebrovascular CirculationGene FrequencyHematocritPlasma SubstitutesMagnetic Resonance ImagingHemodynamicsStroke VolumeFluid ShiftsLung Volume MeasurementsRegional Blood FlowTime FactorsCardiac OutputBlood PressureBrainReproducibility of ResultsPulmonary Diffusing CapacityHemorrhageContrast MediaOxygenBlood Flow VelocityBlood CirculationHemoglobinsHemodilutionDye Dilution TechniqueSpectroscopy, Near-InfraredIsotonic SolutionsHydroxyethyl Starch DerivativesImage Processing, Computer-AssistedShock, HemorrhagicPerfusion ImagingIndocyanine GreenHeart RatePulmonary CirculationMagnetic Resonance AngiographyBlood Volume DeterminationTomography, X-Ray ComputedDogsOxygen ConsumptionOxygen RadioisotopesGadolinium DTPASensitivity and SpecificityVascular CapacitanceHypotensionTomography, Emission-ComputedThoraxFluid TherapyMicrocirculationImage Interpretation, Computer-AssistedReference ValuesCarbon DioxideBrain NeoplasmsVascular ResistancePlethysmographyExchange Transfusion, Whole BloodImage EnhancementAlgorithmsImaging, Three-DimensionalProspective StudiesAnalysis of VariancePolygelineOrgan SizePostureForced Expiratory VolumePressureSplanchnic CirculationCentral Venous PressureIndicator Dilution TechniquesWater-Electrolyte BalanceAcetazolamideRats, Sprague-DawleyLiver CirculationBrain IschemiaModels, BiologicalColoring AgentsDiuresisCarbon MonoxideSupine PositionCatsLungTechnetiumCase-Control StudiesBody WaterPressoreceptorsBlood Gas AnalysisEcho-Planar ImagingSaline Solution, HypertonicPlethysmography, ImpedanceTreatment OutcomeValsalva ManeuverCapillariesRespirationHyperventilationShockVeinsGenotypeAlleles