Atrial Function, LeftAtrial FunctionHeart AtriaAtrial Function, RightAtrial FibrillationEchocardiography, DopplerEchocardiographyVentricular Function, LeftEchocardiography, TransesophagealMitral ValveEchocardiography, Doppler, PulsedPericardiectomyPulmonary VeinsElectric CountershockCatheter AblationStroke VolumeMyocardial ContractionDiastoleHypertrophy, Left VentricularHeart Function TestsCardiomegalyElectrocardiographyProspective StudiesMitral Valve InsufficiencyPredictive Value of TestsHeart DiseasesHeart VentriclesFollow-Up StudiesObserver VariationVentricular FunctionRisk FactorsOrgan SizeBlood Flow VelocityHypertensionTreatment OutcomeHemodynamicsVentricular Dysfunction, LeftRecurrenceGingival HyperplasiaRetrospective StudiesTime FactorsDilatation, PathologicHeart Valve DiseasesAtrial FlutterCardiac Pacing, Artificial