Anatomy 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 💡 Explanation Mechanism of action of digitalis in atrial fibrillation is ✓ Correct Answer: C. Increase in refractoriness of AV nodal tissue