Atrial Function, LeftAtrial FunctionAtrial Function, RightHeart AtriaAtrial FibrillationEchocardiography, DopplerEchocardiography, Doppler, PulsedPericardiectomyElectric CountershockVentricular Function, LeftMyocardial ContractionEchocardiographyHeart Function TestsStroke VolumeEchocardiography, TransesophagealVentricular FunctionObserver VariationBlood Flow VelocityHemodynamicsVentricular Dysfunction, LeftSubcellular FractionsHypertrophy, Left Ventricular