Atrial Function, LeftAtrial FunctionHeart AtriaAtrial Function, RightCardiac VolumeEchocardiography, DopplerAtrial FibrillationVentricular Function, LeftEchocardiographyStroke VolumeEchocardiography, Three-DimensionalDiastoleSinus Arrest, CardiacVentricular Dysfunction, LeftObserver VariationEchocardiography, Doppler, PulsedPericardiectomyElectric CountershockMitral Valve InsufficiencyMyocardial ContractionHemodynamicsHeart Function TestsHeart VentriclesMitral ValveVentricular PressureSystoleHeart FailurePredictive Value of TestsNatriuretic Peptide, BrainOrgan SizeReproducibility of ResultsProspective StudiesEchocardiography, TransesophagealVentricular RemodelingVentricular FunctionElectrocardiographyHypertrophy, Left VentricularROC CurveBlood Flow VelocityCardiomegalyBlood VolumePrognosisReference ValuesTime FactorsFollow-Up StudiesBody Surface AreaSensitivity and SpecificityMagnetic Resonance ImagingRetrospective StudiesRisk FactorsMultivariate AnalysisRisk AssessmentBiological MarkersCohort StudiesMagnetic Resonance Imaging, CinePulmonary VeinsTreatment Outcome