There are multiple definitions:

1. systolic heart failure(English)

   • DCM, DHF, HF, HFrEF, EF
   • Cardiology

2. Swiss Heart Foundation(English)

   • AHA
   • Cardiology, Organizations (scientific)
   • https://www.swi…startseite.html

3. second heart field(English)

   • the source of the myocardium of the outflow tract that contributes to other regions of the heart with the exception of the primitive left ventricle
   • LV
   • Cardiology, Embryology /reproduction, Experimental animal
   • https://doi.org…32.2009.05078.x