Cardiac Resynchronization Therapy DevicesCardiac Resynchronization TherapyCardiac Pacing, ArtificialPacemaker, ArtificialHeart FailureDefibrillators, ImplantableBundle-Branch BlockCoronary SinusVentricular Dysfunction, LeftRalstonia pickettiiVentricular RemodelingStroke VolumeTreatment OutcomeHeart VentriclesProsthesis ImplantationEchocardiographyElectrocardiographyElectrodes, ImplantedVentricular Function, LeftCardiomyopathy, DilatedEchocardiography, DopplerHeart Conduction SystemArrhythmias, CardiacCardiac Output, LowCicatrixVentricular Dysfunction