A drug used for ventricular arrhythmias caused by digoxin?
**Core Concept**
The question is testing the management of a specific type of arrhythmia caused by digoxin toxicity, which is a well-known side effect of this medication. Digoxin toxicity can lead to ventricular arrhythmias, and the correct answer should be a drug that can effectively treat these arrhythmias.
**Why the Correct Answer is Right**
Digoxin toxicity can cause life-threatening ventricular arrhythmias, and the treatment of choice is usually a beta-blocker, specifically **Labetalol**. Labetalol is a non-selective beta-blocker that can effectively reduce the heart rate and contractility of the heart, thereby reducing the arrhythmias caused by digoxin toxicity. It also has alpha-1 adrenergic blocking activity, which can help to reduce blood pressure.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a commonly used drug for treating ventricular arrhythmias caused by digoxin toxicity.
* **Option B:** This option is incorrect because it is not a beta-blocker and is not typically used for treating ventricular arrhythmias caused by digoxin toxicity.
* **Option D:** This option is incorrect because it is not a commonly used drug for treating ventricular arrhythmias caused by digoxin toxicity and may even worsen the situation.
**Clinical Pearl / High-Yield Fact**
When treating digoxin toxicity, it's essential to remember that beta-blockers, such as Labetalol, can be effective in reducing the arrhythmias, but they should be used cautiously due to the risk of exacerbating the toxicity.
**Correct Answer:** C. Labetalol