Atrial Function, LeftAtrial FunctionAtrial Function, RightHeart AtriaAtrial FibrillationEchocardiography, DopplerEchocardiography, Doppler, PulsedPericardiectomyElectric CountershockVentricular Function, LeftMyocardial ContractionEchocardiographyHeart Function TestsEchocardiography, TransesophagealVentricular FunctionStroke VolumeObserver VariationBlood Flow VelocityHemodynamicsVentricular Dysfunction, LeftHypertrophy, Left Ventricular