Digoxin is used in CHF associated with:
Digitalis should be used for patients

Who remain symptomatic even on diuretics and ACE inhibitors.
With heart failure who are in atrial fibrillation and require ventricular rate control.

Note: Digitalis is contraindicated in HOCM and high output cardiac failure.
HOCM (Hypertrophic obstructive cardiomyopathy)
High output failure
Atrial fibrillation with high ventricular rate
All of the above