What is already known?
1. Majority of heart failure (HF) guideline recommended medications were
proved to reduce HF hospitalization and overall mortality.
2. ICD and CRTD primary prevention implant in symptomatic HF patients
with low EF with narrow and wide LBBB, respectively, were sown to
reduced overall mortality.
3. The impact of HF medication regarding ventricular arrhythmia is less
robust.