Cardiac Resynchronization Therapy DevicesCardiac Resynchronization TherapyCardiac Pacing, ArtificialPacemaker, ArtificialDefibrillators, ImplantableHeart FailureBundle-Branch BlockCoronary SinusVentricular Dysfunction, LeftRalstonia pickettiiVentricular RemodelingStroke VolumeTreatment OutcomeAtrial FibrillationHeart VentriclesProsthesis ImplantationEchocardiographyElectrocardiographyAnti-Arrhythmia AgentsElectrodes, ImplantedVentricular Function, LeftCardiomyopathy, DilatedEchocardiography, DopplerHeart Conduction SystemArrhythmias, CardiacCardiac Output, LowCicatrixElectric CountershockVentricular Dysfunction