Atrial AppendageDiverticulumHeart AneurysmEchocardiography, TransesophagealAtrial Function, LeftAtrial FibrillationHeart AtriaThromboembolismThrombosisElectric CountershockSeptal Occluder DeviceHeart DiseasesProstheses and ImplantsMitral Valve StenosisCatheter AblationAtrial FlutterAnticoagulantsEmbolismBlood Flow VelocityPulmonary VeinsRheumatic Heart DiseaseAtrial FunctionCardiac Surgical ProceduresEchocardiographyTherapeutic OcclusionFeasibility StudiesWarfarinCardiac CatheterizationEchocardiography, Doppler, PulsedCardiac CathetersEchocardiography, Three-DimensionalStrokeCardiac Pacing, ArtificialElectrophysiologic Techniques, CardiacCoronary ThrombosisTreatment OutcomeBalloon OcclusionDogsPericardiumMitral ValveEchocardiography, DopplerBalloon ValvuloplastyMyocardial StunningElectrocardiographyVentricular Function, LeftIntracranial EmbolismSuturesHeart Valve DiseasesPericardial EffusionObserver VariationEchocardiography, Doppler, ColorAtrial SeptumLigationFollow-Up StudiesProspective StudiesPredictive Value of TestsSuture TechniquesAtrial Function, RightTachycardia, Ectopic AtrialTime FactorsProsthesis DesignCardiopulmonary BypassSick Sinus SyndromeHeart RateTomography, X-Ray ComputedStroke Volume