Digoxin is contraindicated in?
**Core Concept**
Digoxin is a cardiac glycoside used in the management of heart failure and atrial fibrillation. It works by inhibiting the sodium-potassium ATPase pump, leading to an increase in intracellular calcium and an improvement in myocardial contractility. However, its use is associated with several risks and contraindications.
**Why the Correct Answer is Right**
The correct answer is related to the fact that digoxin can cause a significant increase in intracellular calcium, which can lead to increased automaticity and arrhythmias. This is particularly concerning in patients with pre-existing arrhythmias or those taking other medications that can increase the risk of arrhythmias, such as beta-agonists and non-dihydropyridine calcium channel blockers. Furthermore, digoxin can also cause a decrease in the threshold for atrial fibrillation, making it more likely to occur in susceptible individuals.
**Why Each Wrong Option is Incorrect**
**Option A:** Patients with hypertension are not necessarily contraindicated from digoxin, although they should be monitored closely for signs of toxicity.
**Option B:** Patients with hypokalemia are not contraindicated from digoxin, although they should be treated promptly to avoid worsening the condition.
**Option C:** Patients with liver disease are not necessarily contraindicated from digoxin, although they should be monitored closely for signs of toxicity.
**Clinical Pearl / High-Yield Fact**
A key consideration when using digoxin is the risk of digitalis toxicity, which can occur due to interactions with other medications, electrolyte imbalances, or renal impairment. Patients should be closely monitored for signs of toxicity, including nausea, vomiting, and arrhythmias.
**Correct Answer:** A. Patients with Wolff-Parkinson-White syndrome are contraindicated from digoxin due to the increased risk of inducing atrial fibrillation and ventricular fibrillation.