Stroke VolumeAtrial Function, LeftCardiac OutputVentricular Function, LeftHemodynamicsAtrial FunctionVentricular Function, RightFluid ShiftsAtrial Function, RightBlood PressureStrokeHeart AtriaMonitoring, PhysiologicEchocardiography, TransesophagealVascular ResistanceBlood Flow VelocityHeart RateEchocardiography, DopplerHeartAtrial FibrillationDogsMyocardial ContractionVentricular FunctionBlood VolumeEchocardiography, Doppler, PulsedEchocardiographyPericardiectomyElectric CountershockThermodilutionCardiac VolumeHeart Function TestsHeart VentriclesVentricular Dysfunction, LeftObserver VariationRespirationTime FactorsCardiac CatheterizationPulmonary ArteryOxygen ConsumptionHypertrophy, Left VentricularHeart FailureBrain IschemiaCerebrovascular DisordersFluid TherapyCardiography, ImpedanceProspective StudiesSystoleDiastoleTreatment OutcomeHypovolemiaRisk FactorsFollow-Up StudiesMagnetic Resonance ImagingPlasma VolumeCardiovascular Physiological PhenomenaCerebral InfarctionElectrocardiographyCerebral HemorrhageCentral Venous PressureTomography, X-Ray ComputedReproducibility of ResultsExercise Test