Cardiac Resynchronization Therapy DevicesCardiac Resynchronization TherapyHeart FailureCardiac Pacing, ArtificialPacemaker, ArtificialDefibrillators, ImplantableBundle-Branch BlockVentricular Dysfunction, LeftCoronary SinusRalstonia pickettiiVentricular RemodelingStroke VolumeTreatment OutcomeHeart VentriclesEchocardiographyProsthesis ImplantationElectrocardiographyVentricular Function, LeftCardiomyopathy, DilatedElectrodes, ImplantedEchocardiography, DopplerCardiac Output, LowArrhythmias, CardiacHeart Conduction SystemVentricular DysfunctionCicatrixHeartElectric Countershock