Anatomy Other topics and Adverse effects 4e6a2874 Mechanism of action of digitalis in atrial fibrillation is A By Causing bradycarlia B Na+ K+ ATPase inhibition C Increase in refractoriness of AV nodal tissue D By Causing bradycarlia High-Yield Explanation (Ref: KDT 6/ep502) Digitalis acts in CHF by inhibiting Na+-K+-ATPase whereas in AF, it acts by decreasing the conduction through AV node.