Digoxin
A cardiac glycoside that slows and strengthens the heartbeat; used in heart failure and atrial fibrillation.
Digoxin increases the force of myocardial contraction (positive inotropy) by inhibiting the sodium-potassium ATPase pump, and slows conduction through the AV node (negative chronotropy) by enhancing vagal tone. It has a narrow therapeutic index (0.5–2 ng/mL), making toxicity monitoring essential.
Digoxin is one of the oldest cardiac medications still in clinical use. Its narrow therapeutic window demands careful monitoring; low potassium levels dramatically increase the risk of toxicity, so electrolyte status must be checked regularly.
(Placeholder study content — expanded in the content build step.)
Source: ATI Pharmacology for Nursing Care, 10th ed.
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