Atrial AppendageAtrial Function, LeftEchocardiography, TransesophagealHeart AtriaAtrial FibrillationThromboembolismElectric CountershockThrombosisHeart AneurysmSeptal Occluder DeviceAtrial FunctionHeart DiseasesCatheter AblationAtrial SeptumAtrial FlutterMitral Valve StenosisCardiac Pacing, ArtificialProstheses and ImplantsPulmonary VeinsEchocardiographyCardiac Surgical ProceduresVentricular Function, LeftAnticoagulantsBlood Flow VelocityAtrial Function, RightRheumatic Heart DiseaseElectrophysiologic Techniques, CardiacTachycardia, Ectopic AtrialCardiac CatheterizationPericardiumEmbolismSick Sinus SyndromeDogsFeasibility StudiesTherapeutic OcclusionWarfarinEchocardiography, Doppler, PulsedEchocardiography, Three-DimensionalTreatment OutcomeCardiac CathetersElectrocardiographyVena Cava, SuperiorMitral ValveHeart Valve DiseasesStrokeRefractory Period, ElectrophysiologicalMyocardiumHeart Conduction SystemExtremitiesPericardial EffusionVentricular Dysfunction, LeftCarcinoma, Skin AppendageCoronary ThrombosisHeart SeptumSinoatrial NodeEchocardiography, DopplerPacemaker, ArtificialHeart BlockEndocardiumBalloon OcclusionCefamandoleMyocardial StunningHeart Septal DefectsIntracranial EmbolismPremedicationHeart VentriclesHeart Defects, CongenitalBalloon ValvuloplastyTime FactorsHypertrophy, Left VentricularFollow-Up StudiesObserver VariationProspective StudiesHeartEchocardiography, Doppler, ColorCardiopulmonary BypassHeart RatePredictive Value of TestsMyocardial ContractionLigationSuture TechniquesSutures