Digoxin is a cardiac glycoside used primarily in atrial fibrillation for rate control, and historically in heart failure. Its antiarrhythmic role comes from both direct cardiac effects and vagal (parasympathomimetic) actions.

Good results. Now let me read the key pharmacology and clinical sections for deep content.

Now let me read the core pharmacology section from Katzung and the Braunwald Heart Disease sections on digoxin:

Excellent. Now let me read the key sections from Braunwald and Goodman & Gilman for detailed electrophysiology content:

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